Testing the efficiency and independence of attentional networks

Attention deficits in Amblyopia: A narrative review

Amblyopia has effects on vision that extend from the processing of low-level visual features to higher level functions such as visual attention. In this narrative review, we focus on the impact of amblyopia on visual attention. A structured literature search revealed 28 articles reporting comparisons between amblyopia and normal vision control groups for a variety of visual attention tasks. Several of these articles also included neuroimaging measures. A review of these articles suggested that amblyopia does not affect behavioral performance of tasks with a low attentional load, such as cuing tasks, but deficits emerge for tasks with high demands on visual attention such as multiple object tracking. Deficits are not limited to the amblyopic eye but are also evident under fellow eye and binocular viewing conditions suggesting that abnormal early binocular visual experience can fundamentally alter the development of visual attention. Overall, the current literature suggests that amblyopia is associated with reduced visual attention resources. We raise the possibility that this attention resource deficit may be partially associated with an attentional demand for suppression of the amblyopic eye.

Large-scale functional networks underlying visual attention

Attention networks are loosely defined as the regions of the brain which interact to control behaviour during attentional tasks, but the specific definition of attention networks varies between research programs based on task demands and modalities. The Attention Network Task was designed to exemplify three aspects of attention, alerting, orienting, and executive control, using a visual cueing paradigm. Its proponents propose a system of networks which underlies these aspects. It is debated whether there exists a unified system of networks which underlies attention independently of other cognitive and sensory processing systems. We review the evidence for an attention system within the domain of visual attention. Neuroimaging research using fMRI, EEG, MEG, and others across a variety of tasks attributed to attention, visual cueing, visual search, and divided attention, is compared. This concludes with a discussion on the limitations of an independent "attention system" for describing how the brain flexibly controls many abilities attributed to visual attention.

Saccades and Blinks Index Cognitive Demand during Auditory Noncanonical Sentence Comprehension

Noncanonical sentence structures pose comprehension challenges because they require increased cognitive demand. Prosody may partially alleviate this cognitive load. These findings largely stem from behavioral studies, yet physiological measures may reveal additional insights into how cognition is deployed to parse sentences. Pupillometry has been at the forefront of investigations into physiological measures of cognitive demand during auditory sentence comprehension. This study offers an alternative approach by examining whether eye-tracking measures, including blinks and saccades, index cognitive demand during auditory noncanonical sentence comprehension and whether these metrics are sensitive to reductions in cognitive load associated with typical prosodic cues. We further investigated how eye-tracking patterns differ across correct and incorrect responses, as a function of time, and how each related to behavioral measures of cognition. Canonical and noncanonical sentence comprehension was measured in 30 younger adults using an auditory sentence-picture matching task. We also assessed participants' attention and working memory. Blinking and saccades both differentiate noncanonical sentences from canonical sentences. Saccades further distinguish noncanonical structures from each other. Participants made more saccades on incorrect than correct trials. The number of saccades also related to working memory, regardless of syntax. However, neither eye-tracking metric was sensitive to the changes in cognitive demand that was behaviorally observed in response to typical prosodic cues. Overall, these findings suggest that eye-tracking indices, particularly saccades, reflect cognitive demand during auditory noncanonical sentence comprehension when visual information is present, offering greater insights into the strategies and neural resources participants use to parse auditory sentences.

Neuroelectrical and behavioral correlates of constructed action recognition in Finnish Sign language

Language can be processed with varying levels of attentional involvement; consequently, the interplay between the language and attentional systems in the brain has been extensively studied in spoken languages. However, in signed languages (SLs), this interplay is less well understood. Here, we use Constructed Action (CA) - a meaning-making strategy based on enactment - as a window into the attentional mechanisms recruited in signed language comprehension. We explored the attentional processing of CA by identifying the sequence of processes involved and in which stage CA and its types might be processed differently. Finally, we investigated the associations between the brain mechanisms of CA detection and their behavioral manifestations, as well as with components of attention of the Attention Network Test (ANT). We also measured the electrophysiological correlates of performance on an oddball CA detection task in deaf and hearing L1 signers. We found that processes involved in all signers' active detection of CA involved automatic (indexed by N1 and P2) and attention-based processes (indexed by N2s and P3s). N2 posterior bilateral were also more negative for tokens of overt CA than for PT-only signs, while P3a was more positive for all types of CA than for PT. No significant results were found regarding the ANT. We conclude that specific attentional involvement in CA detection is triggered by the increasing enacting elements and saliency involved in CA. This study yielded new insights into the functional interaction between the neural mechanisms underlying attentional control and those mediating CA processing in SL.

Auditory processing and its cognitive correlates in older adults with mild cognitive impairment

INTRODUCTION

Age-related central auditory processing disorder (CAPD) is linked to cognitive decline in older adults, potentially preceding Mild Cognitive Impairment (MCI) by several years. While studies indicate that all auditory processing domains are impacted, it remains unclear which domain most significantly correlates with cognitive functions in MCI, warranting further investigation into these relationships. The current study investigated auditory processing deficits and their relationship with cognitive performance in older adults with MCI.

METHOD

The study recruited 70 participants aged 60 to 72 years, divided into two groups: MCI(n = 35) and healthy controls (n = 35) based on Montreal Cognitive Assessment scores. Comprehensive central auditory processing and cognitive assessments were done.

RESULTS

The MCI group showed significant deficits across all auditory processing and cognitive domains. The enhanced right ear advantage in the dichotic test could be due to corpus callosum atrophy affecting left ear processing. Different factor structures in MCI suggest that they relied more on attentional resources for complex auditory tasks. Temporal processing tests showed high sensitivity in identifying MCI, with strong AUC and R² values, underscoring their clinical relevance.

CONCLUSION

Temporal processing deficits could serve as an early screening tool for cognitive decline in older adults. Larger studies targeting individuals with age-related hearing loss (ARHL) and MCI are essential, given the prevalence of ARHL in this population. Research should also examine the impact of tailored auditory training on cognitive function in MCI to inform interventions.

TRIAL REGISTRATION

The study was registered in the Clinical Trials Registry of India (CTRI/2023/06/054277) on 21/06/2023 ( http://ctri.nic.in/ ).

Altered Structure-Function Coupling Associated with Attention Decline in Shift Work Disorder

Introduction

Previous studies on shift work disorder (SWD) have revealed altered functional and structural brain networks underlying attention decline. However, changes in structure-function coupling (SFC) and their relationship with attention decline remain unknown. This study aimed to examine the role of changed SFC in abnormal attentional network function in SWD.

Methods

Thirty-four patients with SWD and thirty-two healthy controls were recruited. All participants underwent resting-state functional magnetic resonance imaging (fMRI) and diffusion tensor imaging (DTI) scans. All participants underwent an attentional network test to evaluate their functions. Finally, Pearson's correlation analysis was conducted to analyze the association between aberrant attentional network function and altered structural and functional connectivity (SC-FC) coupling in patients with SWD.

Results

Compared to healthy subjects, decreased alerting and executive functions were found in patients with SWD. In addition, we observed decreased SC-FC coupling in patients with SWD, specifically in the left anterior cingulate gyrus (T = -3.6449, P = 0.0003), central opercular cortex (T = -3.7187, P = 0.0002), middle frontal gyrus (T = -3.8342, P = 0.0001), and parietal operculum cortex (T = -3.6121, P = 0.0003), compared with healthy subjects. Better altering performance was significantly associated with lower SC-FC coupling in the anterior cingulate gyrus of patients with SWD (r = -0.51, P = 0.002).

Discussion

Our findings unravel that the decreased SC-FC coupling in the anterior cingulate gyrus may contribute to the impaired altering network function in SWD, which can further understand the neural mechanisms of impaired attention in SWD and inform a potentially therapeutic intervention for SWD patients.

Effect of a Six-Month Dance Intervention on Postural Control and Fall-Related Outcomes in Older Adults with Mild Cognitive Impairment: A Randomized Controlled Trial

BACKGROUND/OBJECTIVES

Older adults with mild cognitive impairment often exhibit reduced postural control and increased fall risk. As fall-related injuries consume substantial healthcare resources, the development of fall-preventive interventions is of public health relevance. This study aims to investigate the effects of a six-month dance intervention on postural control and fall-related measures in older adults with mild cognitive impairment.

METHODS

In this randomized controlled trial, 55 participants were allocated to either an intervention group or a control group. The intervention group performed two 90-min dance training sessions per week for six months, while the control group maintained their usual activities of daily living. Postural control was operationalized via balance performance, which was measured with the Sensory Organization Test and the Limits of Stability Test. Neuromuscular function of the lower extremities was assessed via muscle contraction velocity using tensiomyography. Fear of falling was quantified with the Falls Efficacy Scale, and participants reported fall history over the past year. It was hypothesized that older adults with mild cognitive impairment participating in the six-month dance training would show significantly greater improvements in postural control and fall-related outcomes than those in the control group.

RESULTS

A mixed analysis of variance (time × group) revealed no significant improvements in balance performance or neuromuscular function following the dance intervention (p > 0.05). However, several main effects for time were observed in the Sensory Organization Test, Limits of Stability Test, and muscle contraction velocity. Scores on the Falls Efficacy Scale improved significantly in the intervention group, reflecting reduced fear of falling, although only shown by a paired-samples t-test (t(23)= 2.276, p = 0.032, d = 0.465).

CONCLUSIONS

This study did not provide evidence that a six-month dance intervention improves postural or neuromuscular functions. However, it cannot be ruled out that such null findings are related to confounding factors, such as insufficient training specificity or duration. Nonetheless, the fear of falling was significantly reduced in the intervention group, suggesting potential benefits for perceived fall risk in older adults with mild cognitive impairment.

Theta-gamma tACS modulates attention network synchronization, not isolated network performance

As the brain ages, oscillatory changes disrupt neuronal communication, contributing to cognitive decline in key areas such as parts of the attention network system. This study explores the effects of multi-session low-intensity transcranial Alternating Current Stimulation (tACS) on the efficiency of the alerting, orienting, and executive control networks in older adults. Using a 16-session theta-gamma tACS protocol targeting the prefrontal cortex, we examined its impact on Attention Network Task (ANT) performance of 76 participants aged 55 to 84 in a randomized, double-blind, sham-controlled design. To account for the influence of brain state, both active and sham tACS groups underwent cognitive n-back training during stimulation. Despite no significant modulations in attention network efficiencies, generalized linear mixed-effect modeling revealed that active tACS negatively influenced overall reaction time (RT) improvements, resulting in poorer ANT performance compared to the sham group. Additionally, active tACS disrupted network correlations post-intervention, particularly affecting the alerting network's interactions with the orienting and executive networks. These findings provide further evidence for the involvement of theta-gamma coupling in attention processes, though without network-specific effects. The results underscore the potential of frequency-specific neurostimulation to modulate cognitive functions but also emphasize the need for caution, as such interventions may inadvertently impair brain network dynamics.

CuddleCard: Protocol for a randomized controlled trial evaluating the effect of providing financial support to low-income mothers of preterm infants on parental caregiving in the neonatal intensive care unit (NICU)

BACKGROUND

Preterm birth is a leading cause of childhood mortality and developmental disabilities, with persistent socioeconomic disparities in incidence and outcomes. Maternal presence during prolonged neonatal intensive care unit (NICU) hospitalization is critical for preterm infant health, enabling mothers to provide breast milk, directly breastfeed, and engage in skin-to-skin care-all of which promote infant physiological stability and neurodevelopment. Low-income mothers face significant barriers to visiting the NICU and participating in caregiving due to financial burdens and the psychological impact of financial stress. This randomized controlled trial aims to evaluate the effectiveness of financial transfers in promoting maternal caregiving behaviors that directly impact preterm infant health outcomes during NICU hospitalization.

METHODS

We will conduct a two-arm, single-blinded randomized controlled trial with 420 Medicaid-eligible mothers of infants born between 24 weeks 0 days to 34 weeks 1 day gestation across four Level 3 NICUs in Georgia and Massachusetts. Mothers in the intervention arm will receive standard of care enhanced with weekly financial transfers and will be informed that these funds are intended to help them spend more time with their infants in the NICU. All participants will be provided with a hospital-grade breast pump and educational materials on the benefits of breast milk and skin-to-skin care. Participants will complete surveys during their infant's hospitalization and following discharge, capturing outcomes related to maternal mental and physical health, caregiving behaviors, cognitive function, financial and socioeconomic factors, infant health and growth, and perceptions of NICU care quality. Primary outcomes are the provision of breast milk and engagement in skin-to-skin care. Secondary outcomes include infant growth and health outcomes, NICU visitation, financial and socioeconomic hardship, maternal physical and mental health measures, cognitive function, and perception of NICU care quality.

DISCUSSION

This study will provide evidence of the impact of financial transfers on maternal caregiving behaviors in the NICU, addressing critical gaps in our understanding of how financial stress affects low-income mothers. Findings may inform health policy, particularly regarding Medicaid coverage of non-medical services, and contribute to understanding how to address disparities in preterm infant care.

TRIAL REGISTRATION

The trial was prospectively registered with the American Economic Association Trial Registry, the primary registry for academic economists conducting policy trials, on 16 April 2024 (AEARCTR-0013256). It was also registered on ClinicalTrials.gov (NCT06362798) on 10 April 2024.

Changes in topological properties of brain structural covariance networks and alertness in temporal lobe epilepsy with and without focal to bilateral tonic-clonic seizures

This study investigated brain structural covariance network (SCN) topological changes and alertness in temporal lobe epilepsy (TLE) with and without focal to bilateral tonic-clonic seizures (FBTCS). Seventy-eight subjects, including 32 TLE patients with FBTCS (TLE-FBTCS), 46 TLE patients without FBTCS (TLE-FS), and 42 healthy controls (HCs), underwent the Attention Network Test to assess alertness and volumetric MRI scans. SCNs were constructed and analyzed using graph theory. Results showed that TLE-FS patients had lower total cerebral volume than HCs, and the lowest volume was observed in the TLE-FBTCS group. Compared to HCs and TLE-FBTCS patients, TLE-FS patients exhibited increased small-worldness, normalized clustering coefficient, global efficiency, and modularity, but decreased normalized characteristic shortest path length and assortativity. Specific brain regions, such as the hippocampus, thalamus, and superior temporal sulcus, showed changes in nodal clustering coefficients and efficiency in TLE-FS patients. Further analysis revealed decreased intrinsic/phasic alertness in TLE-FBTCS patients. Correlation analysis indicated that SCN topological properties were associated with alertness in TLE-FS patients but not in TLE-FBTCS patients. These findings suggest that TLE-FS and TLE-FBTCS patients show different changes in SCN integration and segregation, with TLE-FS alertness linked to SCN topological properties, providing insights into TLE's neuropathological mechanisms.

Brain activity dynamics after traumatic brain injury indicate increased state transition energy and preference of lower order states

Traumatic Brain Injury (TBI) can cause structural damage to the neural tissue and white matter connections in the brain, disrupting its functional coactivation patterns. Although there are a wealth of studies investigating TBI-related changes in the brain's structural and functional connectomes, fewer studies have investigated TBI-related changes to the brain's dynamic landscape. Network control theory is a framework that integrates structural connectomes and functional time-series to quantify brain dynamics. Using this approach, we analyzed longitudinal trajectories of brain dynamics from acute to chronic injury phases in two cohorts of individuals with mild and moderate to severe TBI, and compared them to non-brain-injured, age- and sex-matched control individuals' trajectories. Our analyses suggest individuals with mild TBI initially have brain activity dynamics similar to controls but then shift in the subacute and chronic stages of the injury (1 month and 12 months post-injury) to favor lower-order visual-dominant states compared to higher-order default mode dominant states. We further find that, compared to controls, individuals with mild TBI have overall decreased entropy and increased transition energy demand in the sub-acute and chronic stages that correlates with poorer attention performance. Finally, we found that the asymmetry in top-down to bottom-up transition energies increased in subacute and chronic stages of mild TBI, possibly indicating decreased efficacy of top-down inhibition. We replicate most findings with the moderate to severe TBI dataset, indicating their robustness, with the notable exception of finding the opposite correlation between global transition energy and mean reaction time (MRT). We attribute differences to the cohorts' varied injury severity, with perhaps a stronger compensatory mechanism in moderate to severe TBI. Overall, our findings reveal shifting brain dynamics after mild to severe TBI that relate to behavioral measures of attention, shedding light on post-injury mechanisms of recovery.

A systematic review and meta-analysis of the acute effect of caffeine on attention

RATIONALE

Although there is broad agreement that caffeine provides an acute improvement in attention in the normal population, estimates of effect size vary and the relationship between dose and effect is unclear.

OBJECTIVE

To examine the acute effect of caffeine on attention in a systematic review and meta-analysis.

METHODS

PsycINFO, PubMed, and Scopus were searched for records published in English with no limits on the year of publication. Studies were included if they were randomized, double-blinded, placebo-controlled, and if they examined the acute effect of pure caffeine on behavioral tests of attention in rested, healthy adults. For every included trial, eligible outcomes were extracted and aggregated to form one composite standardized mean difference (SMD; Hedges' adjusted g) for reaction time and one for accuracy. The SMDs were then combined in random-effects meta-analyses. Additionally, several subgroup analyses were conducted, including meta-regressions on dose-response relationships.

RESULTS

Thirty-one trials with a total of 1455 participants were included in the meta-analysis. Significant effects in favor of caffeine were found for both accuracy, g = 0.27, and reaction time, g = 0.28. Subgroup analyses showed that higher doses of caffeine (≥ 200 mg) improved both reaction time and accuracy more than lower doses, but whereas a positive linear dose-response relationship was found for reaction time, a quadratic relationship was found for accuracy. The effect of caffeine was not related to differences in habitual caffeine consumption, task complexity, or which attention network was taxed.

CONCLUSION

The current evidence shows that in the normal population, caffeine acutely enhances attention by improving both reaction time and accuracy. However, whereas higher doses continue to enhance reaction time, accuracy improves only up to a certain point before declining.

The Everyday Function Intervention Trial (EFIT) protocol: A randomized clinical trial

BACKGROUND

Preserving cognition and everyday function is essential for maintaining independence and reducing risk of Alzheimer's disease and related dementias (ADRD). Useful Field of View training (UFOVt) is a computerized cognitive training program that achieves these goals; however, the mechanisms underlying UFOVt are unclear. The Everyday Function Intervention Trial (EFIT) is a double-blind randomized clinical controlled trial designed to assess potential cognitive, psychosocial, biological, and lifestyle mechanisms underlying UFOVt. In the current paper, we outline the protocol employed in EFIT.

METHODS

Community-dwelling older adults (N = 96) completed cognitive, psychosocial, health, and lifestyle assessments on a study-provided laptop at baseline, post-test, and three-month follow-up, along with additional daily cognitive, psychosocial, health, and lifestyle assessments on a study-provided smartphone throughout the study period. Following baseline, participants were randomized into the cognitive training or active control group completing twenty hours of brain games across ten weeks. A subsample (n = 38) completed additional activities: wearing a FitBit, undergoing MRI scans, and using at-home sleep monitors across two nights at baseline and post-test. Aside from MRI sessions, participants completed study activities remotely.

DISCUSSION

EFIT's design included several novel features: ecological momentary assessment; remote data collection; evaluation of mediators before, during, and after training; training tasks targeting one cognitive domain at a time; performance-based and self-reported everyday function and instrumental activities of daily living measures; use of an active control group; and an exploratory multilevel modeling analytic approach. These features will provide an in-depth understanding of intervention transfer effects and guide the design of future cognitive interventions.

Effect of Intraoperative Dexmedetomidine on Early Attention Network Function After Gynaecological Surgery: A Randomized Controlled Study

BACKGROUND

Perioperative neurocognitive disorder (PND) is a common neurological complication in patients after surgery and anaesthesia. Whether dexmedetomidine affects postoperative attention network function remains unclear.

METHODS

Eighty patients aged 40-60 years underwent elective gynaecological surgery under total intravenous anaesthesia, before induction dexmedetomidine (group D) or placebo (group P) was used. The attention network test was used to assess the function of three attention networks pre- and post-operation, and blood samples were collected to test inflammatory factors and neurotransmitters.

RESULTS

The three networks of the two groups were obviously impaired after the operation. Horizontally, on the 1st postoperative day, the degree of impairment of the alerting network in group D was less than that in group P (p = 0.033), and the orienting network was completely protected (p < 0.001, vs. group P; p = 0.058, vs. baseline), while the executive control network improved (p < 0.001, vs. group P; p = 0.045, vs. baseline). Moreover, all the inflammatory factors levels in group P increased on the 1st postoperative day. In contrast, the acetylcholine (ACh) and dopamine (DA) levels decreased significantly (p = 0.049 for ACh, p < 0.001 for DA). In group D, the inflammatory factors and serum neurotransmitters showed different patterns.

CONCLUSION

Dexmedetomidine can protect against impairment of early postoperative attention network function in middle-aged female patients.

REGISTRATION NUMBER

This trial has been registered with the Chinese Clinical Trial Registry (https://www.chictr.org.cn) (ChiCTR2000031283).

Original article: adolescent dietary patterns derived using principal component analysis and neuropsychological functions: a cross-sectional analysis of Walnuts Smart Snack cohort

A balanced diet is relevant for neuropsychological functioning. We aimed to analyze the association between dietary patterns and neuropsychological outcomes in a sample of healthy adolescents of the Walnuts Smart Snack (WSS) cohort from Barcelona city. We performed principal components analysis (PCA) to determine dietary patterns in the adolescent sample using a food frequency questionnaire (60 items). Multiple linear regression models were performed to analyze the association between PCA dietary patterns with neuropsychological outcomes: Strengths and Difficulties (SDQ) externalizing and internalizing scores, Attention Network Test (ANT) Impulsivity Index and Emotional Recognition Task (ERT) scores. We additionally adjusted the models for child sex, age, body mass index (BMI), physical activity and maternal education. Six dietary patterns were identified in PCA analyses. "low consumption of calorie-dense foods" dietary pattern had a negative association (protective) with the both SDQ outcomes (p value < 0.001) and "Nuts" dietary pattern showed a negative (protective) association with impulsivity index( β 1 = -24.60, 95% CI = -36.80, -12.41, p value < 0.001). Overall, our main results suggest that healthy dietary patterns, including higher intakes of "nuts" and a preference of "low consumption of calorie-dense foods" dietary patterns, could provide a beneficial association with neuropsychological functions during the adolescence period. The associations may include improvements of externalizing and internalizing problem symptoms, and impulsivity.

Impact of anthropomorphism in AI assistants' verbal feedback on task performance and emotional experience

Artificial intelligence (AI) assistants are increasingly deployed across various fields to replace human operators in providing feedback to users, making anthropomorphism a pivotal topic in AI-assisted interactions. We investigated the impact of varying degrees of anthropomorphism in verbal feedback on task performance and user experience. A total of 30 participants were recruited, and their task performance and subjective experiences in response to different levels of feedback were measured. Moderate-level anthropomorphic verbal feedback elicited significantly lower self-efficacy and pleasure compared to high- and low- level feedback. Notably, under high-level feedback, participants demonstrated a significant increase in response speed compared to lower levels. These findings suggested that high-level feedback of AI assistants could enhance participants' performance and experience, thereby improving training or learning efficacy. However, moderate-level anthropomorphic feedback appeared to be less effective. The study outcomes could offer insights for future research and design of AI voice systems.

The impact of total sleep deprivation on attentional networks and its neural mechanisms: Based on the Attention Network Test

Sleep deprivation, both daily and occupational, has become a prevalent issue in modern society, significantly affecting individuals' attention functions. Traditionally, attention was viewed as a singular, unified system, but advances in neuroscience have revealed it as a network involving coordinated interactions across multiple brain regions. Posner and Petersen's Attention Network Theory delineates three distinct subcomponents - alerting, orienting, and executive control - based on anatomical localization and neurobiochemical mechanisms. However, most studies on sleep deprivation often overlook these subcomponents, treating attention as a generalized process. This paper aims to address this gap by investigating the effects of total sleep deprivation (TSD) on these attentional subcomponents and their potential neural mechanisms focusing on both the general healthy population and specific occupational groups. Using the Attention Network Test (ANT) paradigm and its variants, the findings reveal that TSD differentially affects the three subcomponents of attentional networks, with occupation-specific differences. Notably, the impact of TSD on executive control exhibits greater variability. The state instability hypothesis and local sleep theory are proposed to explain these neural mechanisms, suggesting that TSD disrupts attentional networks through an interplay of top-down state instability and bottom-up local sleep processes. Future research should refine experimental paradigms related to attentional networks, integrate cognitive neuroscience methodologies and computational modeling approaches, and expand investigations into sleep restriction. Such advancements will provide a more comprehensive understanding of how TSD affects attentional networks and further elucidate the interplay between the state instability hypothesis and local sleep theory.

Impact of Tai Chi Therapy on Fatigue and Cognitive Function in Individuals With Chronic Fatigue Syndrome: Protocol for a Pilot Randomized Controlled Trial

BACKGROUND

Chronic fatigue syndrome (CFS) is a psychosomatic disorder characterized by persistent fatigue, primarily involving physical and mental exhaustion, with greater emphasis on the latter. This leads to a deterioration in concentration and memory. These symptoms affect cognitive functions, including attention and memory, to varying degrees. Previous research has shown that Tai Chi can help reduce fatigue in individuals with CFS. However, the relationship between alleviating CFS-related fatigue through Tai Chi and its impact on cognitive functions remains unclear. The effects of Tai Chi on cognitive functions in individuals with CFS have not been clinically validated, and its efficacy and safety have yet to be examined through large-scale randomized controlled trials. Therefore, this protocol outlines a pilot randomized, parallel, single-blind clinical trial designed to evaluate the impact of Tai Chi therapy on fatigue and cognitive functions in individuals with CFS, using both subjective and objective assessments.

OBJECTIVE

This pilot study aims to explore the preliminary efficacy and safety of Tai Chi in reducing fatigue and improving cognitive function in patients with CFS, and to generate data to inform future large-scale trials.

METHODS

We will conduct a randomized, analyst-blinded, parallel-controlled trial with a 12-week intervention period and a 4-week follow-up. Enrolled patients will be randomly assigned to either the Tai Chi group (30 patients) or the health education group (30 patients). The Tai Chi group will receive the 24-style simplified Tai Chi intervention, while the control group will receive a health education intervention. Following the 12-week intervention, a 4-week follow-up will be conducted. The Tai Chi group will train 3 times per week, consisting of 2 in-person sessions at the Physical Education Center of Shanghai University of Traditional Chinese Medicine and 1 self-directed session guided online by an instructor. The primary outcome measure is the 20-item Multi-Dimensional Fatigue Inventory (MFI-20). The secondary outcome measures include the Montreal Cognitive Assessment (MoCA), Pittsburgh Sleep Quality Index (PSQI), Attention Network Test (ANT), working memory performance (N-Back task), and magnetic resonance imaging.

RESULTS

The research protocol and informed consent form were approved by the Shanghai Clinical Research Ethics Committee on March 18, 2024 (approval number SECCR2024-22-01). Participant recruitment began in April 2024. All interventions and concurrent data collection will be completed by October 2025, and the 4-week postintervention follow-up assessments will be finalized by the end of October 2025. Data management is still ongoing; therefore, data analysis has not yet been performed.

CONCLUSIONS

As a pilot trial, the findings of this study will provide preliminary clinical evidence on the role of Tai Chi in improving cognitive function in patients with CFS and will serve as a foundation for designing future large-scale trials.

TRIAL REGISTRATION

China Clinical Trials Registry ChiCTR2400082268; https://tinyurl.com/2tkr7j7x.

INTERNATIONAL REGISTERED REPORT IDENTIFIER (IRRID)

DERR1-10.2196/65958.

Interaction of mercury exposure and DNA methylation with sustained attention in children in a novel analysis of epigenetic susceptibility

The etiology of attention-deficit/hyperactivity disorder (ADHD) remains poorly understood, despite it being one of the most common neurodevelopmental disorders worldwide. Past research suggests methylmercury exposure and DNA methylation (DNAm) levels are each associated with ADHD in children, yet whether they interact to affect ADHD is unknown. Leveraging data from a longitudinal cohort of children in Mexico, this novel epigenetic-environment interaction study identified significant interactions between childhood mercury exposure (measured at 6-12 years of age) and adolescent blood leukocyte DNAm in their association with sustained attention [quantified via the Conners continuous performance test, 3rd edition (CPT3)] measured on average 5.6 ± 0.99 years later. Using adjusted linear regression, we assessed associations between hair and urine mercury concentrations and CPT3 scores reflecting inattention, impulsivity, vigilance, and sustained attention (N = 399). We then tested the interaction between mercury and DNAm at loci previously associated with the CPT3 outcomes (N = 374). Significant associations between mercury and CPT3 differed in magnitude and direction depending on the mercury biomarker and CPT3 variable. These associations often differed by gender. For example, urine mercury was positively associated with vigilance scores in males [β = 1.31(SE = 0.65), P = .045] but not in females [β = -0.20 (SE = 0.81), P = .80). In all children, three significant mercury-DNAm interactions were identified for either inattention or vigilance outcomes. Among females, 155 significant interaction terms were identified for the inattention models. In males, three significant interactions were identified for the impulsivity model. Overall, results suggest in some cases DNAm can influence the association between mercury exposure and ADHD-like symptoms.

Neurophysiological Markers of Design-Induced Cognitive Changes: A Feasibility Study with Consumer-Grade Mobile EEG

BACKGROUND

Evidence-based design aims to create healthy environments grounded in scientific data, yet the influence of spatial qualities on cognitive processes remains underexplored. Advances in neuroscience offer promising tools to address this gap while meeting both scientific and practical demands. Consumer-grade mobile EEG devices are increasingly used; however, their lack of transparency complicates output interpretation. Well-established EEG indicators from cognitive neuroscience may offer a more accessible and interpretable alternative.

METHODS

This feasibility study explored the sensitivity of five established EEG power band ratios to cognitive shifts in response to subtle environmental design experiences. Twenty participants completed two crossover sessions in an office-like setting with nature-inspired versus urban-inspired design elements. Each session included controlled phases of focused on-screen cognitive task and off-screen breaks.

RESULTS

Factorial analyses revealed no significant interaction effects of cognitive state and environmental exposure on EEG outcomes. Nonetheless, frontal (θ/β) and frontocentral (β/[α + θ]) ratios showed distinct patterns across cognitive states, with more pronounced contrasts in the nature-inspired compared to the urban-inspired design conditions. Conversely, occipital ([θ + α]/β), (θ/α), and (β/α) ratios remained consistent across exposures. Data triangulation with autonomic nervous system responses and performance metrics supported these observations.

CONCLUSIONS

The findings suggest that EEG power band ratios can capture brain-environment interactions. However, limitations of consumer-grade EEG devices challenge both scientific rigour and practical application. Refining methodological reliability could improve interpretability, supporting more transparent and robust data-driven design decisions.

Introspective access to value-based multi-attribute choice processes

People routinely choose between options varying on multiple attributes - homes to rent, movies to watch, and so on. Here, we test how much awareness people have of the mental processes underlying these choices. We develop a method to quantify awareness of value-based multi-attribute choice processes that accounts for diverse choice strategies. Across five studies, participants make choices and then report how they believe they made them. We use computational modeling to identify the process revealed in their choices, and compare it to their self-reports to quantify individuals' accuracy about their choice process. While we observe substantial variation in accuracy, participants are often highly accurate about their choice process - more accurate than predicted by a sample of decision scientists - and more accurate than informed third-party observers, suggesting evidence for introspection. These results challenge notions that we are strangers to ourselves and instead suggest that people often know how they made value-based choices.

Exploring the Complexity of Children's Math and Vocabulary Learning: The Role of Cognitive, Dispositional, and Parental Factors

Early mathematical and vocabulary skills serve as critical foundations for academic success, yet the mechanisms underlying their development remain complex. This study examines the role of parents' education, children's attentional control, and learning approaches as predictors of kindergarteners' mathematics and vocabulary performance. Using a sample of 149 children aged 60-72 months in Shanghai, China, we conducted a path analysis to explore direct and indirect relationships among these factors. Findings indicate that parental education indirectly predicts math ability through children's learning approaches and attentional control, emphasizing the role of both cognitive and behavioral pathways. Conversely, vocabulary development is directly influenced by parental education and learning approaches, suggesting distinct developmental trajectories for math and language acquisition. These results highlight the interconnected nature of cognitive, behavioral, and environmental influences on early academic performance. Implications for early childhood education emphasize the need for targeted interventions that not only engage parents in fostering language-rich and cognitively stimulating environments but also support children's motivation, persistence, and attentional capacities.

A Naturalistic Prospective Study of the Prognostic Impact of EPHX2 in Major Depressive Disorder: Impulsivity may be an Important Factor

Background: Major depressive disorder (MDD) is a leading cause of disability worldwide. The pathophysiology of MDD remains unclear, which limits the development of treatments for MDD. Recently, epoxide hydrolase 2 (EPHX2) has been found to be associated with MDD. Our previous study revealed an association between EPHX2 expression and suicide. However, the effect of EPHX2 on the prognosis of MDD and suicide remains unclear. Previous studies have found that impulsivity at baseline can be a significant predictor of clinical improvement in patients with MDD. Therefore, we inferred that EPHX2 could be associated with the treatment effect of MDD, and impulsivity could mediate the effect of EPHX2 on the treatment effect of MDD. Methods: This naturalistic prospective study included 117 participants with MDD, who were assessed, using clinical questionnaires, cognitive function, and treatment information, at baseline, 2 weeks, and 1, 2, and 3 months. A linear mixed-effects model was used to investigate longitudinal changes in the severity of symptoms, risk of suicide, and cognitive function. Results: The interactive effects of impulsivity and EPHX2 polymorphisms on the risk of suicide (measured by the Columbia-Suicide Severity Rating Scale) were significantly different for rs11288636, rs68012435, and rs11288636. The interactive effects between polymorphisms and time on depression severity (measured by the Hamilton Depression Scale-24) were significantly different and including after adjustment for the total impulsivity score. Conclusions: This study suggests that EPHX2 polymorphisms are associated with the prognosis of MDD, and impulsivity could be a critical factor for the change in suicide risk among different EPHX2 genotypes. Trial Registration: ClinicalTrials.gov identifier: NCT05575713.

Memory impairments observed after a half night sleep restriction are not mediated by working memory, attention, or inhibitory control mechanisms

Sleep restriction is a growing issue in our modern society and thus it is crucial to uncover its neurocognitive consequences. Especially declarative memory is negatively affected by sleep loss due to its critical dependence on the hippocampus, a brain area known to be susceptible to sleep loss. Studies have shown that even a half night sleep restriction is sufficient to induce impairments in a range of hippocampus-dependent forms of memory. Nevertheless, memory performance is, at least to some extent, dependent on other cognitive functions. The aim of the current study was to reveal whether memory deficits observed after one night sleep deprivation, as observed in animal studies, translate to man, and whether these effects are mediated by impairments in other cognitive domains. We hypothesized that the memory paradigms would be affected but that, due to the short nature of the sleep restriction, this effect would not be mediated by other cognitive functions. To this end, fifty-five healthy participants conducted a test battery containing paradigms measuring verbal learning, spatial memory, attention, working memory, and response inhibition after a night of regular sleep or acute partial sleep restriction. The results of the study showed an impairment in both hippocampus-dependent memory tests, while no negative consequences of sleep deprivation were revealed on the other cognitive domains. In conclusion, our data indicate that the observed deficit in memory performance after a half night sleep deprivation is not mediated by impairments in attention (alerting, orienting, and executive control), working memory, or motor inhibitory control mechanisms.

Longitudinal multimodal neuroimaging after traumatic brain injury

Traumatic brain injury is a major cause of long-term cognitive impairment, yet the mechanisms underlying recovery remain poorly understood. Neuroimaging methods such as diffusion MRI, functional MRI, and positron emission tomography (PET) provide insight into micro- and macro-scale changes post-TBI, but the relationships between regional cellular and functional alterations remain unclear. In this study, we conducted a longitudinal, multimodal neuroimaging analysis quantifying TBI-related pathologies in four biomarkers, namely flumazenil PET derived binding potential, dMRI-derived structural connectivity, and resting-state fMRI-derived functional connectivity and fractional amplitude of low-frequency fluctuations in individuals with mild-to-severe brain injury at the subacute (4-6 months post-injury) and chronic (1-year postinjury) stages. Brain injury related regional pathologies, and their changes over time, were correlated across the four biomarkers. Our results reveal complex, dynamic changes over time. We found that flumazenil-PET binding potential was significantly reduced in frontal and thalamic regions in brain injured subjects, consistent with neuronal loss, with partial recovery over time. Functional hyperconnectivity was observed in brain injured subjects initially but declined while remaining elevated compared to non-injured controls, whereas cortical structural hypoconnectivity persisted. Importantly, we observed that brain injury related alterations across MRI modalities became more strongly correlated with flumazenil-PET at the chronic stage. Regions with chronic reductions in flumazenil-PET binding also showed weaker structural node strength and lower amplitude of low frequency fluctuations, a relationship that was not found at the subacute stage. This observation could suggest a progressive convergence of structural and functional disruptions with neuronal loss over time. Additionally, regions with declining structural node strength also exhibited decreases in functional node strength, while these same regions showed increased amplitude of low frequency fluctuations over time. This pattern suggests that heightened intrinsic regional activity may serve as a compensatory mechanism in regions increasingly disconnected due to progressive axonal degradation. Altogether, these findings advance our understanding of how multimodal neuroimaging captures the evolving interplay between neuronal integrity, structural connectivity, and functional dynamics after brain injury. Clarifying these interrelationships could inform prognostic models and enhance knowledge of degenerative, compensatory, and recovery mechanisms in traumatic brain injury.

Cognitive neuropsychological and neuroanatomic predictors of naturalistic action performance in left hemisphere stroke: A retrospective analysis

Individuals who have experienced a left hemisphere cerebrovascular accident (LCVA) have been shown to make errors in naturalistic action tasks designed to assess the ability to perform everyday activities such as preparing a cup of coffee. Naturalistic action errors in this population are often attributed to limb apraxia, a common deficit in the representation and performance of object-related actions. However, naturalistic action impairments are also observed in right hemisphere stroke and traumatic brain injury, populations infrequently associated with apraxia, and errors across all these populations are influenced by overall severity. Based on these and other data, an alternative (though not mutually exclusive) account is that naturalistic action errors in individuals with LCVA are also a consequence of deficits in general attentional resource availability or allocation. In this study, we conducted a retrospective analysis of data from a group of 51 individuals with LCVA who had completed a test of naturalistic action, along with a battery of tests assessing praxis, attention allocation and control, reasoning, and language abilities to determine which of these capacities contribute uniquely to naturalistic action impairments. Using a regularized regression method, we found that naturalistic action impairments are predicted by both praxis deficits (hand posture sequencing and gesture recognition), as well as attention allocation and control deficits (orienting and dividing attention), along with language comprehension ability and age. Using support vector regression-lesion symptom mapping, we demonstrated that naturalistic action impairments are associated with lesions to posterior middle temporal gyrus and anterior inferior parietal lobule regions known to be implicated in praxis; as well the middle frontal gyrus that has been implicated in both praxis and attention allocation and control. Together, these findings support the hypothesis that naturalistic action impairments in people with LCVA are a consequence of apraxia as well as deficits in attention allocation and control.

Protocol for a pilot hybrid type I effectiveness-implementation study to improve help-seeking for sleep disorders in the future healthcare workforce: The Sleep Check Before Shift Work trial

Sleep disorders are prevalent in shift workers but are commonly undiagnosed and unmanaged. This poses considerable safety, productivity, and health risks. There is limited education or early intervention to encourage awareness of, and treatment for, sleep disorders in young adults who will transition into careers requiring shift work. This study aims to investigate (a) the clinical effectiveness of simulated shift work exposure and cognitive performance feedback for prompting help-seeking for sleep problems, and (b) the feasibility and acceptability of implementing this intervention for future healthcare workers. A hybrid type I effectiveness-implementation trial will be conducted from June 2024 to December 2025 with prospective healthcare workers currently enrolled in a medicine, paramedicine, or nursing degree. Ninety adults (18-39 years) who self-report sleep disturbances will be recruited and complete a combination of structured clinical interviews, screening questionnaires, remote monitoring technology, and overnight polysomnography (PSG). Participants will be randomized across three conditions, with varying exposure to a simulated transition to night shift without sleep, and cognitive performance feedback. All individuals will attend a diagnostic appointment with a sleep psychologist or sleep physician and discuss help-seeking pathways for their sleep. The primary outcomes will be help-seeking from a health professional for sleep (yes/no), time to help-seeking (days), and road safety-related events over 12 months. Process evaluation will explore the feasibility and acceptability of this approach from the participants' perspective.

Neural dynamics underlying the cue validity effect in target conflict resolution

Cue validity significantly influences attention guidance, either facilitating or hindering the ability for conflict resolution. Previous studies have demonstrated that the validity effect and conflict resolution are associated with better/worse behavioral performance and specific neural activations; however, the underlying neural mechanism of their interaction remains unclear. We hypothesized that the effect of cue validity might sustain specific sequences of neural activities until target occurrence and throughout the subsequent conflict resolution. In this study, we recorded the scalp electroencephalography during the Attention Network Test paradigm to investigate their interactions in neural dynamics. Specifically, we performed a cluster-level channel-time-frequency analysis to explore significant time-frequency neural activity patterns associated with these interactions, in scalp regions of interest determined by a data-driven strategy. Our results revealed a string of significant neural dynamics in the frontal and parietal regions, including initial broad-band (especially the gamma-band) activations and subsequent complex cognitive processes evoked/effected by the invalid cue, that were firstly elicited. Finally, the resolution of conflict was completed by the frontal behavior-related theta-band power reduction. In summary, our findings advanced the understanding of the temporal and spectral sequences of neural dynamics, with the key regions involved in the resolution of conflict after invalid cueing.

Effect of Brain Computer Interface Training on Frontoparietal Network Function for Young People: A Functional Near-Infrared Spectroscopy Study

AIMS

Inattention in young people is one of the main reasons for their declining learning ability. Frontoparietal networks (FPNs) are associated with attention and executive function. Brain computer interface (BCI) training has been applied in neurorehabilitation, but there is a lack of research on its application to cognition. This study aimed to investigate the effect of BCI on the attention network in healthy young adults.

METHODS

Twenty-seven healthy people performed BCI training for 5 consecutive days. An attention network test (ANT) was performed at baseline and immediately after the fifth day of training and included simultaneous functional near-infrared spectroscopy recording.

RESULTS

BCI performance improved significantly after BCI training (p = 0.005). The efficiencies of the alerting and executive control networks were enhanced after BCI training (p = 0.032 and 0.003, respectively). The functional connectivity in the bilateral prefrontal cortices and the right posterior parietal cortex increased significantly after BCI training (p < 0.05).

CONCLUSION

Our findings suggested that repetitive BCI training could improve attention and induce lasting neuroplastic changes in FPNs. It might be a promising rehabilitative strategy for clinical populations with attention deficits. The right PPC may also be an effective target for neuromodulation in diseases with attention deficits.

Executive functions assessment in very preterm children at school age: A pilot study about a clinical and experimental approach

While the survival rate of very preterm (VPT) infants has increased in the last decades, they are still at risk of developing long-term neurodevelopmental impairments, especially regarding self-regulatory abilities, and goal-directed behaviors. These skills rely on executive functions (EFs), an umbrella term encompassing the core capacities for inhibition, shifting, and working memory. Existing comprehensive tests are time-consuming and therefore not suitable for all pediatric neuropsychological assessments. The Flanker task is an experimental computer game having the advantage to last less than ten minutes while giving multiple EFs measures. Here, we tested the potency of this task in thirty-one VPT children aged 8-10 years during their clinical assessment. First, we found that VPT children performed in the norm for most clinical tests (i.e., WISC-V, BRIEF, and NEPSY) except for the CPT-3 where they were slower with more omission errors, which could indicate inattentiveness. Second, some Flanker task scores were correlated with standardized clinical testing without resisting to multiple comparisons correction. Finally, compared to full-term children, VPT children showed poorer performance in global EFs measure and lower accuracy in the Flanker task. These findings suggest that this child-friendly version of the Flanker task demonstrated a reasonable sensitivity in capturing EFs with good discrimination between VPT and term children despite VPT children's mild difficulties. It may represent a promising tool for neuropsychological assessments and be suitable as a screening test, providing further validating larger studies. Moreover, while VPT schoolchildren globally display normal intelligence, subtle difficulties that seem to relate to EFs are observed.

The multiscale brain structural re-organization that occurs from childhood to adolescence correlates with cortical morphology maturation and functional specialization

From childhood to adolescence, the structural organization of the human brain undergoes dynamic and regionally heterogeneous changes across multiple scales, from synapses to macroscale white matter pathways. However, during this period, the developmental process of multiscale structural architecture, its association with cortical morphological changes, and its role in the maturation of functional organization remain largely unknown. Here, using two independent multimodal imaging developmental datasets aged 6-14 years, we investigated developmental process of multiscale cortical organization by constructing an in vivo multiscale structural connectome model incorporating white matter tractography, cortico-cortical proximity, and microstructural similarity. By employing the gradient mapping method, the principal gradient derived from the multiscale structural connectome effectively recapitulated the sensory-association axis. Our findings revealed a continuous expansion of the multiscale structural gradient space during development, characterized by enhanced differentiation between primary sensory and higher-order transmodal regions along the principal gradient. This age-related differentiation paralleled regionally heterogeneous changes in cortical morphology. Furthermore, the developmental changes in coupling between multiscale structural and functional connectivity were correlated with functional specialization refinement, as evidenced by changes in the participation coefficient. Notably, the differentiation of the principal multiscale structural gradient was associated with improved cognitive abilities, such as enhanced working memory and attention performance, and potentially underpinned by synaptic and hormone-related biological processes. These findings advance our understanding of the intricate maturation process of brain structural organization and its implications for cognitive performance.

The role of cerebellar-cortical connectivity in modulating attentional abilities: insight from football athletes

Neuroplasticity, a phenomenon present throughout the lifespan, is thought to be influenced by physical training. However, the relationship between neuroplastic differences and attentional abilities remains unclear. This study explored the differences in brain function and attentional abilities between professional football athletes and novices, and further investigated the relationship between the two. To address this question, we included 49 football athletes and 63 novices in our study, collecting data on resting-state functional connectivity and Attention Network Test (ANT). Behavioral results from the ANT indicated that football experts had superior orienting attention but weaker alerting functions compared to novices, with no difference in executive control attention. fMRI results revealed that football experts exhibited higher fractional Amplitude of Low-Frequency Fluctuations (fALFF) values in the bilateral anterior cerebellar lobes, bilateral insula, and left superior temporal gyrus. Functional connectivity analysis showed increased connectivity between the left anterior cerebellar lobe and various cortical regions, including the right supramarginal gyrus, left precuneus, left superior frontal gyrus, bilateral posterior cerebellar lobes, and bilateral precentral gyri in experts compared to novices. More importantly, in the expert group but not in novice group, functional connectivity differences significantly predicted attentional orienting scores. Graph theoretical analysis showed that experts exhibited higher betweenness centrality and node efficiency in the right cerebellar lobule III (Cerebelum_3_R) node. Our findings demonstrate that long-term professional football training may significantly affect neuroplasticity and attentional functions. Importantly, our analysis reveals a substantive connection between these two aspects, suggesting that the integration of neuroplastic and attentional changes is likely mediated by cerebellar-cortical connectivity.

Characterizing the functioning of the attentional networks in state and trait anxiety: the role of affective information

Introduction

The aim of the present research was to examine the role of affective information in the functioning of attentional networks in individuals with high vs. low trait or state anxiety. Previous studies suggest that anxiety can influence attentional processes, but the impact of affective information, such as alerting emotional stimuli, on these attentional networks remains unclear.

Methods

We conducted a set of experiments using negative or neutral faces as alerting stimuli, presented either alone or together with a neutral sound, within a modified version of the Attention Network Test-Interactions (ANT-I). Additionally, data from previous experiments with similar anxiety groups and without affective manipulations of alertness were analyzed for comparative insights (378 participants in total).

Results

Results showed three main effects on the functioning of attentional networks when affective alerting signals were introduced: (1) the alertness effect is increased, (2) the interference effect is increased, and (3) the orienting effect is decreased. These effects occurred regardless of the valence of the alerting stimuli on a given trial. Importantly, the presence of affective information on some trials eliminated the group differences regarding the functioning of the attentional networks that are usually found when no affective information is presented. Specifically, the larger interference effect commonly observed in individuals with high trait-anxiety and the larger alertness and orienting effects seen in those with high state-anxiety, disappeared when emotional alerting stimuli were included.

Discussion

The findings suggest that emotional information can significantly impact the functioning of attentional networks, particularly in relation to anxiety. The presence of affective stimuli seems to modulate attentional biases associated with anxiety, potentially neutralizing the usual effects seen in individuals with high trait or state anxiety. The role of affective information on the functioning of the attentional networks is discussed within the framework of anxiety and attention.

Cognitive neuropsychological and neuroanatomic predictors of naturalistic action performance in left hemisphere stroke: a retrospective analysis

Individuals who have experienced a left hemisphere cerebrovascular accident (LCVA) have been shown to make errors in naturalistic action tasks designed to assess the ability to perform everyday activities such as preparing a cup of coffee. Naturalistic action errors in this population are often attributed to limb apraxia, a common deficit in the representation and performance of object-related actions. However, naturalistic action impairments are also observed in right hemisphere stroke and traumatic brain injury, populations infrequently associated with apraxia, and errors across all these populations are influenced by overall severity. Based on these and other data, an alternative (though not mutually exclusive) account is that naturalistic action errors in individuals with LCVA are also a consequence of deficits in general attentional resource availability or allocation. In this study, we conducted a retrospective analysis of data from a group of 51 individuals with LCVA who had completed a test of naturalistic action, along with a battery of tests assessing praxis, attention allocation and control, reasoning, and language abilities to determine which of these capacities contribute uniquely to naturalistic action impairments. Using a regularized regression method, we found that naturalistic action impairments are predicted by both praxis deficits (hand posture sequencing and gesture recognition), as well as attention allocation and control deficits (orienting and dividing attention), along with language comprehension ability and age. Using support vector regression-lesion symptom mapping, we demonstrated that naturalistic action impairments are associated with lesions to posterior middle temporal gyrus and anterior inferior parietal lobule regions known to be implicated in praxis; as well the middle frontal gyrus that has been implicated in both praxis and attention allocation and control. Together, these findings support the hypothesis that naturalistic action impairments in people with LCVA are a consequence of apraxia as well as deficits in attention allocation and control.

The Effects of Bilingualism on the Executive Control Abilities of the Prader-Willi Syndrome Population

Unlike with the typically developing population, non-typically developing individuals, especially those with intellectual disabilities, have usually been recommended to learn and use only one language, despite perhaps coming from bilingual families or living in multilingual environments. This common practice, however, is not backed by empirical evidence; previous research, although limited, has systematically shown that bilingualism does not have negative effects. This study investigates how bilingualism shapes the executive control abilities of individuals with genetic disorders. Specifically, we compare the interference suppression abilities of Spanish-Catalan bilinguals and Spanish monolinguals with Prader-Willi syndrome. Fifteen participants with Prader-Willi syndrome were recruited in Spain. The bilingual group consisted of seven Spanish-Catalan bilinguals from Catalonia-an officially bilingual territory of Spain-, while the monolingual group was formed by eight Spanish speaking individuals from Madrid-an officially monolingual territory. Participants were administered two widely used psychological tasks: the Flanker Task (a non-language-based task) and the Stroop Task (a language-based task). Three experimental conditions were included in each task: neutral, congruent, and incongruent. Both accuracy and reaction time data were collected and analyzed. The results obtained are consistent between both tasks in showing (i) no detrimental effects of bilingualism; (ii) a high answer accuracy rate; (iii) a practice effect (the more familiar participants became with the tasks the faster their answers became); (iv) sensitivity to an interference effect (higher reaction times for incongruent trials than neutral trials) but not to a clear facilitation effect (lower reaction times for congruent trials than neutral trials). These results, far from being anecdotal, are in line with results from previous research investigating the effects of bilingualism among typically developing individuals as well as non-typically developing individuals with and without genetic disorders. This study not only evidences that Prader-Willi individuals can become bilingual if they are exposed to more than one language, but also that they can do so without showing negative effects at the cognitive level. In fact, taking into account the trend in the descriptive data, if an effect of bilingualism were in place, it would be a positive one. Bilingualism has repetitively been proven to neither be a burden nor to have negative effects for the typically or the non-typically developing population. Thus, as previous researchers have pointed out, there seems to be a clear incongruity between what the research is showing and the actual advice that these individuals and their families are receiving, and this should be amended without further delay.

The impact of a walnut-rich breakfast on cognitive performance and brain activity throughout the day in healthy young adults: a crossover intervention trial

A healthy diet is essential for optimal brain health and many bioactives from food are linked to cognitive benefits. To examine whether walnuts led to cognitive improvements throughout the day, 32 healthy young adults, aged 18-30, were tested in a double-blind, crossover pilot study, to compare the effects of a breakfast containing 50 g walnuts with a calorie-matched control containing no nuts. Cognition, mood, blood, and EEG measures were recorded at baseline and 2, 4, and 6 hours postprandially. Mood ratings for negative affect appeared worse following walnuts compared to control, possibly due to a general dislike of the intervention. However, walnuts elicited faster reaction times throughout the day on executive function tasks. Memory recall performance at 2 hours was worse for walnuts compared to control, but by 6 hours this finding was reversed with walnuts outperforming the control. EEG PSD analysis revealed differences in frontoparietal activity in the walnut condition compared to the control condition during memory recall and during executive function performance. These results may reflect between-treatment differences in cognitive effort or attentional processes while performing the tasks. Blood analysis revealed lower circulating non-esterified fatty acids and small increases in glucose availability following consumption of walnuts compared to control, suggesting enhanced glucose availability as one possible mechanism of action. Further investigations of other potential mechanisms are needed. Overall, these findings provide evidence for reaction time benefits throughout the day following a walnut-rich breakfast, while memory findings were mixed with benefits only observed later in the day. However, more research is needed into how diets containing walnuts might regulate cognitive improvements in humans postprandially and over the longer term.

Adaptive modes of attention: Evidence from attentional networks

Posner and Petersen (1990) suggested that the attention system is composed of three networks: alerting, orienting, and executive functioning or control. Drawing on this theory, the Attentional Networks Test (ANT) was designed to quantify the functionality of the three attention networks. The ANT is used extensively in psychology, neuroscience, and medicine. Later adjustments of the ANT have demonstrated that the three attention networks do not operate independently and can interact. The current study examined whether such interactions are constant or result from task demands. In three experiments (N = 147) we measured alerting, orienting, executive control and their interactions while manipulating task demands. The interactions between the three networks differed between experiments, with no interactions detected in the third experiment. We conclude that the interactions between executive functioning and alertness, and between executive functioning and orienting depend on spatial processes and are not an innate feature of attention. Our results suggest that the three attention networks can function independently, depending on task demands. Our findings offer experimental support for Posner and Petersen's theory (1990) and suggest a novel way to optimize attention measurements.

Separating neurocognitive mechanisms of maintenance and compensation to support financial ability in middle-aged and older adults: The role of language and the inferior frontal gyrus

This study investigated the role of brain regions involved in arithmetic processing in explaining individual differences in financial ability in 67 50-74-year-old cognitively normal adults. Structural integrity and resting-state functional connectivity measures were collected in the MRI scanner. Outside the scanner, participants performed financial ability and other cognitive tasks, and answered questionnaires to determine dementia risk, and financial risk and protective factors. Regions of interest involved in arithmetic processing were defined, focusing on language- and quantity-processing areas in temporo-frontal and parieto-frontal cortices, respectively. Our results showed that structural integrity and functional connectivity in brain regions associated with arithmetic retrieval were positively associated with financial ability, with language skill mediating left IFG structural integrity and financial ability. Connectivity patterns suggested that reliance on quantity mechanisms (i.e. calculation) was associated with poorer financial ability. Analyses revealed that reliance on these brain mechanisms did not depend on participants' age or risk of dementia and that protective factors such as household income or financial literacy supported the maintenance of connectivity related to financial abilities.

Acute aerobic exercise ameliorates craving and attentional function in individuals with methamphetamine use disorders

OBJECTIVE

Chronic methamphetamine use is frequently associated with impairments in the attentional network (alerting, orienting, conflict networks) and related brain regions, which significantly trigger METH-related cravings. The aim of this study is to investigate the effects of moderate-intensity acute aerobic exercise on cravings and attentional networks in individuals with methamphetamine use disorders (MUD).

METHODS

Using a cross-over design, this study recruited 32 male MUDs to randomly complete a 30min moderate-intensity aerobics exercise condition (65%-75% HRmax) and an assigned material reading control condition, with a 7-day washout interval. All participants completed Visual Analog Scales before, during, and after exercise, until the HR dropped to 110% of the resting heart rate, in preparation for the Attention Network Test (ANT).

RESULTS

The aerobic exercise significantly reduces the participants' cravings. There were no differences observed in the efficiency of alerting and orienting networks between the aerobic exercise and control conditions, however, the efficiency of conflict network was enhanced after exercise. Furthermore, the results showed a significant negative correlation between the enhancements in conflict network efficiency and the reductions in post-exercise craving scores for both conditions.

CONCLUSION

Moderate-intensity acute aerobic exercise significantly improves the attentional network, especially enhancing the conflict network in individuals with MUD. Additionally, the improvement of the conflict network is closely related to the reduction in cravings in individuals with MUD, suggesting that aerobic exercise may reduce cravings through improvements in cognitive function.

Indicators of improved emotion behavior in 6-14-year-old children following a 4-week placebo controlled prebiotic supplement intervention at home with a parent

BACKGROUND

In this double-blind placebo-controlled randomised intervention we investigated the potential benefits of a prebiotic supplement on children's well-being in a home setting. The primary aim was to determine if this supplement could effectively reduce anxiety, improve mood, and enhance cognitive function, similar to findings in young adults.

METHODS

Fifty-three healthy children, aged 6 to 14, participated in an 8-week trial. The trial consisted of three testing time points; day zero marked the baseline measurement (T1) followed by a 28-day supplement intervention period during which they consumed 5.5 g of the prebiotic galactooligosaccharides (GOS) daily under parental guidance. Endline measures (T2) were conducted on the last day of supplement consumption, with a final follow-up testing session (T3) on day 56. Primary outcomes were trait anxiety using a questionnaire and emotional behavior in a dot-probe task on responses to positive and negative images. Secondary outcomes encompassed depression levels, cognitive function tests, and dietary intake recorded in a 4-day food diary. Additionally, we explored whether parents' emotional behavior had an impact on children's responses.

RESULTS

While our statistical analysis did not reveal significant effects of GOS, there were noteworthy trends. Trait anxiety levels decreased over time in both groups, with a more pronounced decrease in the GOS group (after intervention, p =.090; after follow-up, p =.031). The GOS group exhibited reduced negative emotional responses compared to the placebo group (p =.105), and post-trial depression levels decreased in the GOS group over time (p =.015). Although parental emotional responses correlated with various emotional outcomes in children, they did not influence the intervention effects.

CONCLUSIONS

These findings suggest positive trends in line with our hypotheses, however further investigation with greater statistical power would be beneficial.

TRIAL REGISTRATION

Retrospectively registered on https://clinicaltrials.gov/ [NCT06258135] on February 6, 2024.

The effects of 15-day complete fasting on the attentional network: An ERP study

This study examined whether and how a 15-day complete fast affects attentional network function. During a 15-day complete fasting, 17 healthy participants completed an attentional network test, while behavioral and EEG data were obtained. EEG results were marginally significant for the interaction between fasting stages and cue hints on the N1 amplitude of the altering network (F (3, 48) = 2.57, p = 0.065, η2p = 0.14). The interaction between fasting stages and cue hints was marginally significant on the N1 amplitude of the orienting network (F (3, 48) = 2.71, p = 0.056, η2p = 0.15). The interaction between fasting stages and target types was significant on the N2 amplitude of the executive control network (F (3, 48) = 2.86, p = 0.047, η2p = 0.15). The main effect of target types was significant on the P3 amplitude (F (1, 16) = 4.71, p = 0.045, η2p = 0.23). This suggests that participants' allocation of attentional resources to the three sub-networks of the attentional network was not significantly affected during the 15 days of complete fasting. These study results help further understand the relationship between complete fasting and attentional networks and provide theoretical support and reference for the survival and work of astronauts actively in complete fasting during future near-Earth planet landings or even deep space exploration.

Crochet increases attention through a requiring motor skill learning

In this study, we compared the effects promoted by a brief single session of crochet in a group of skilled knitters (CRO) and a control group (CRT) on the Attentional Network Test (ANT) and the whole brain Functional Connectivity (FC) revealed by Magnetoencephalography (MEG). Data revealed that crochet determined a significant effect (before, T0, vs after, T1, the crochet session) on reaction times (for all cue and stimulus types), improving alertness and orienting networks (but not executive control) only in the CRO group. Data of FC are coherent with the behavioural ones. We observed that the Betweenness Centrality maximum (BCmax) index in the beta band significantly increased, and global FC in the alpha band significantly increased at T1 for the CRO group but not for the CTR group. Increased global BCmax in the beta band after the crochet activity correlated with better performance (reduced reaction times), suggesting that the brain has become more efficiently integrated, thus increasing the information exchange between different brain areas. Decreased global FC in the alpha band may reflect a transition from a quiet, global rest to a condition of increased alertness and readiness to stimuli. Finally, we discuss the hypothesis that these results could be the reinforcement of connections between motor and attentional networks promoted by learning the complex motor skills of crochet.

Tumor resting-state fMRI connectivity to extralesional brain is associated with cognitive performance in glioma patients

Introduction

Functional coupling of the tumor to extralesional brain areas and the pretherapeutic cognitive performance status have each independently been identified as prognostically relevant in glioma patients. It is however unclear, whether tumor-connectivity correlates with cognitive performance or the cognitive outcome.

Research question

To investigate potential associations between pre- and postoperative resting-state fMRI connectivity (FC) and cognitive functions in glioma patients compared to healthy controls.

Material and methods

18 patients and 18 age-matched, healthy controls underwent resting-state fMRI and neuropsychological testing pre- and 4.5 months (mean) postoperatively. FC of the tumor to extralesional brain (Tu-EL) was determined, as well as FC of extralesional brain (EL) and the contralesional hemisphere (conEL). Groups were compared with regard to behavioral and FC measures.

Results

Patients showed deficits in all cognitive domains tested. While postoperative performance tended to be worse, deterioration was not statistically significant between timepoints. EL FC did not differ between groups, but conEL FC (p < .045) was increased in patients as compared to controls. Tu-EL FC was significantly associated with worse attention performance (p < .001), and, by trend (p < .058), with worse attentional outcome in patients.

Discussion and conclusion

Intrinsic functional coupling to the rest of the brain was associated with worse cognitive performance and might relate to pathological tumor-neuron interaction on the macroscale, reflecting the invasive nature of diffusely infiltrating glioma. Deepening our understanding of FC measures at the connectomic level in the context of cancer neuroscience may aid in identifying neurophysiological correlates of cognitive impairment and in prognosticating cognitive outcome in glioma patients.

In the heat of the moment: the effects of extreme temperatures on the cognitive functioning of firefighters

Exposure to high temperatures can have detrimental effects on cognitive processing and this is concerning for firefighters who routinely work in extreme temperatures. Whilst past research has studied the effects of heat on firefighter cognition, findings are mixed, and no work has measured the time course of cognitive recovery. This study compared working memory, vigilance, and cognitive flexibility of 37 firefighters before and after they engaged in a live-fire training exercise with temperatures exceeding 115 °C. To assess recovery, cognition was measured on exiting the fire, then 20- and 40-minutes post-fire. Results showed impaired vigilance and cognitive flexibility (increased errors, slower responses) immediately after the fire, but recovery at 20-minutes. These findings indicate that a live indoor fire negatively impacts cognitive processing, but this effect is relatively short-lived and return to baseline functioning is seen 20-minutes after exiting the fire. The findings could be used to inform re-entry and cooling decisions.

The role of attention in eliciting a musically induced visual motion aftereffect

Previous studies have reported visual motion aftereffects (MAEs) following prolonged exposure to auditory stimuli depicting motion, such as ascending or descending musical scales. The role of attention in modulating these cross-modal MAEs, however, remains unclear. The present study manipulated the level of attention directed to musical scales depicting motion and assessed subsequent changes in MAE strength. In Experiment 1, participants either responded to an occasional secondary auditory stimulus presented concurrently with the musical scales (diverted-attention condition) or focused on the scales (control condition). In Experiment 2 we increased the attentional load of the task by having participants perform an auditory 1-back task in one ear, while the musical scales were played in the other. Visual motion perception in both experiments was assessed via random dot kinematograms (RDKs) varying in motion coherence. Results from Experiment 1 replicated prior work, in that extended listening to ascending scales resulted in a greater likelihood of judging RDK motion as descending, in line with the MAE. In contrast, the MAE was eliminated in Experiment 2. These results were internally replicated using an in-lab, within-participant design (Experiment 3). These results suggest that attention is necessary in eliciting an auditory-induced visual MAE.

The role of art knowledge training on aesthetic judgements and executive functions

The study of how we develop art knowledge can provide valuable insights into the underlying cognitive systems that support expertise and knowledge transfer to new contexts. An important and largely unanswered question is whether art knowledge training impacts subsequent judgements of artworks and executive functions. Across three pre-registered experiments (N > 630 total), which used a training intervention and Bayesian regression modelling, we explore whether art knowledge training impacts subsequent judgements of artworks and executive functions. Experiments 1 and 2 revealed an effect of art training on aesthetic judgements for trained but not untrained artworks. These training effects were generalized to unseen artworks produced by the same artist (Experiment 1) or another artist with a similar style (Experiment 2), but not to different art styles. Experiment 2 also showed that with larger training 'doses' (>16 minutes), the generalization effects are stronger. Experiment 3 showed invariance of the attentional network to art training versus non-art training, suggesting similar sensitivity of executive functions to different types of training. This work shines new light on the cognitive systems that support learning and generalization of learning to new contexts. Likewise, from an applied perspective, it emphasizes that learning and generalization can occur rapidly with a relatively short (approx. 16 minutes) training video.

The Effect of Task Cognitive Difficulty on Perceptual-Cognitive Indicators: Evidence on the Relationship Between Challenge Point Framework (CPF) and Cognitive Development in Table Tennis Beginners

Introduction

Motor learning, in addition to influencing the practice of physical activity, affects cognitive skills related to prediction and decision. One key principle in sports training is designing exercise programs that optimize cognitive-motor performance, based on the Challenge Point Framework (CPF). The aim of this study is to investigate the effect of different levels of work difficulty on cognitive-perceptual indicators in table tennis beginners.

Methods

Forty-two female beginners in table tennis (ages 20-35) were divided into high, moderate, low task difficulty, and control groups based on pre-test scores of attention networks. The intervention consisted of 8 daily training sessions, each lasting 30 minutes. Pre- and post-test comparisons were made to evaluate changes in cognitive-perceptual performance.

Results

Post-test results showed improvements in executive control of attention and cognitive effort across all groups. But there was no significant difference between the groups.

Discussion

These findings suggest that cognitive task difficulty, much like functional difficulty, aligns with predictions from the CPF, enhancing executive control and cognitive effort, and thereby supporting motor learning.

Conclusion

Cognitive difficulty, like functional difficulty, takes advantage of the challenge point framework and improves cognitive-cognitive indicators.

Adaptive cognitive control in 4 to 7-year-old children and potential effects of school-based yoga-mindfulness interventions: an exploratory study in Italy

Introduction

Recent findings showed that adaptive cognitive control (CC) can be instantiated by bottom-up mechanisms, including statistical contingency of event occurrence. However, the developmental evidence in this domain remains limited.

Methods

To address this gap, our study delves into the exploration of different mechanisms underlying adaptive CC in a substantial cohort of young children (211 participants aged between 4 and 7 years). We utilized the Dynamic Temporal Prediction (DTP) task and a modified version of the Flanker task to assess the effect of context predictability on motor preparation/inhibition and interference control, respectively. Furthermore, as part of an exploratory study designed to evaluate the feasibility of a school-based program in Italy, all children underwent a re-testing session after an 8-week intervention involving yoga-mindfulness.

Results

Results suggested that young children can exploit global probabilistic changes to optimize motor preparation/ inhibition while counterbalancing fatigue effects. Moreover, they successfully modulate interference control as a function of environmental contingencies, displaying more optimal conflict resolution when proactive control is engaged. Finally, we observed a post-intervention increase of the capability to implicitly adapt motor preparation/inhibition and a boosting effect on the interference control functions.

Discussion

Overall, these findings confirmed that adaptive CC is already present in preschool-aged children, extending these results to include 4-years-olds. Additionally, school-based yoga-mindfulness programs are feasible and might improve children's capability to flexibly and proactively adapt to environmental requests promoting cognitive proficiency.

The effect of infra low frequency-neurofeedback training on pistol shooting performance and attention in semi-skilled players

Purpose

Neurofeedback (NF) typically involves an operant conditioning or other reinforcement protocol aimed at self-regulating patterns of brain activation. Endogenous Neuromodulation, characterized by the absence of discrete reinforcers, has emerged over the last two decades with the extension of training into the infra-low frequency regime, i.e., below 0.1 Hz. Specifically, Infra-Low Frequency (ILF) Neurofeedback training has demonstrated efficacy in enhancing the self-organization and regulation of the central nervous system in considerable generality. The present study explores a pivotal question: Can Infra-Low Frequency (ILF) Neurofeedback, acknowledged for its influence on arousal, vigilance, and emotional states, effectively enhance both attention generally and shooting performance specifically? Additionally, we explored whether the training exerted beneficial effects on three attentional networks-Conflict, Orienting, and Alerting.

Methods

To assess shooting performance, we employed the Shooter's Coordination Analysis Target Training (SCATT), while attention networks were gauged through the Attention Network Test (ANT). Twenty semi-skilled pistol shooters, aged 28-40, underwent both the ANT and SCATT assessments before and after completing 20 half-hour ILF-Neurofeedback sessions. The participants were randomly assigned to two groups: an ILF NFB group, which underwent 20 sessions of ILF NFB training, and a control group that received no NFB.

Results

Our findings revealed that ILF-Neurofeedback significantly enhanced performance. In the ANT, the training led to a reduction in Conflict and an increase in Orienting and Alerting.

Conclusion

The study demonstrates the effectiveness of ILF-Neurofeedback in improving shooting performance, and in positively impacting all three attention networks assessed by the ANT.

Readiness for Perception and Action: Towards a More Mechanistic Understanding of Phasic Alertness

Human survival requires prompt perception and action to address relevant events in the environment. For this, the brain has evolved a system that uses warning stimuli to elicit phasic alertness, a state readying the brain for upcoming perception and action. Although a wealth of empirical evidence revealed how phasic alertness improves a wide range of perceptual and cognitive processing, it is still unclear by what cognitive mechanisms this is achieved. Here, we identify key problems that have to be solved for this to be possible and delineate concrete ways to achieve this. Specifically, we discover I) how to establish phasic alertness as a cognitive state of readiness for perception and action, II) how it can affect cognition online or offline, III) how it could be triggered internally without a warning, and IV) to what degrees it relied on bottom-up processing, or top-down temporal or stimulus expectations and the current task. As a result, the discussion provides us with a research program yielding the theoretical and empirical basis for mechanistic and computational models of phasic alertness and its neurophysiological underpinnings.