The social motivation theory of autism

Comparison of the Sensory Profile Among Autistic Individuals and Individuals with Williams Syndrome

PURPOSE

With the current study, we aimed to reveal the similarities and differences in sensory profiles between Williams syndrome (WS) and autism spectrum disorder.

METHODS

Using the sensory profile questionnaire completed by the caregivers, we analyzed the WS (n = 60, 3.4-19.8 years) and autistic (n = 39, 4.2-14.0 years) groups.

RESULTS

The Severity Analysis revealed a significant group difference in Sensory Sensitivity but not in Low Registration, Sensation Seeking, and Sensation Avoiding subscales. Age can modulate the subscale scores differently across groups. For Sensation Seeking, the scores of both groups decreased with development. However, the scores of Sensory Sensitivity decreased with age in the autistic group but not in the WS group. Sensation Avoiding scores increased with development in the WS group but not in the autistic group. No significant developmental changes were observed in Low Registration.

CONCLUSION

This study highlights the cross-syndrome similarities and differences in sensory profiles and developmental changes in autistic individuals and individuals with WS.

From social effort to social behavior: An integrated neural model for social motivation

As humans rely on social groups for survival, social motivation is central to behavior and well-being. Here we define social motivation as the effort that initiates and directs behavior towards social outcomes, with the goal of satisfying our fundamental need for connection. We propose an integrated framework of social motivation which emphasizes the maintenance of optimal connection levels through effort exertion, regulating social approach and avoidance, which allow interpersonal synchrony. Together, these behaviors serve as basic building blocks of social behavior, and give rise to behaviors critical for collective living such as cooperation and empathy. We describe a neural model according to which social connection levels are monitored by the hypothalamus, while the anterior cingulate cortex and anterior insula respond to detected social deficiency. As adjustment is required, the social effort system - comprised of the thalamus and striatum - is activated. This system directs neural networks that permit interpersonal synchrony or, conversely, desynchronization, aiming to restore and maintain optimal connection by preventing isolation on the one hand, and exaggerated social closeness on the other hand. The proposed framework offers insights into disorders characterized by aberrant social motivation, potentially identifying neural dysfunctions that may inform novel interventions.

Mothers and fathers' perception of social-responsive behaviors of autistic individuals

BACKGROUND

The interplay between behavioral differences presented by autistic males and females, and gender norms might influence caregivers' behavior perceptions, contributing to the later identification of autistic females.

AIM

Our study aims to investigate differences in mothers' and fathers' perceptions of children's behaviors typically associated with autism. Further, we aim to analyze parental perception of children's behaviors in relation to their offspring's sex. Second, our objective is to examine differences in the perception of behaviors of males and females to better understand females' phenotypes and potential reasons for their underdiagnosis METHODS: The sample consisted of 40 children and adolescents (M chronological age = 8.75 years, SD = 1.10, Range = 4-16.75), 20 males and 20 females, with their mothers and fathers. Parental perceptions are studied through the Social Responsiveness Scale, a quantitative report instrument that assesses autistic characteristics.

RESULTS

Mothers and fathers reported similar profiles of their children. However, females presented better abilities in relation to Social Communication and fewer Mannerisms than males. However, clinicians' observations scores related to the ADOS-2 did not show evidence of differences in behavioural characteristics typically associated with autism.

CONCLUSIONS

These mechanisms should be further explored as they might partly determine females' later diagnosis. Children's age plays a significant role, as older individuals present more severe behaviors associated with autism in the dimensions previously mentioned and Social Motivation. Hence, a late diagnosis can exacerbate behavioral presentation of autism.

The Effects of Dialogic Reading Intervention on Verbal Interaction and Engagement in Young Autistic Children: A Randomized Controlled Preliminary Study

The current study investigated whether dialogic reading could improve the verbal response, initiation of communication (questioning and commenting), receptive vocabulary and task engagement in 14 children with autism by using a randomized controlled trial. Moreover, we explored whether the effect of dialogic reading could be generalized to new books. Nine children with autism (mean age = 5.32 years, SD = 1.08) were randomly assigned to the dialogic reading group and five children (mean age = 5.25 years, SD = 1.18) were assigned to the standard book reading group. All children participated in four stages: pre-test, intervention, post-test, and generalization. The intervention was conducted over a four-week period, with three sessions per week, for a total of 12 sessions. We found that during the intervention, children in the dialogic reading group showed significant improvements in responding to adult questions and initiating comments compared with children in the standard book reading group. In addition, the dialogic reading facilitated the vocabulary knowledge and reduced the level of disengagement of children with autism. Further, children in the dialogic reading group could generalize the learned communication skills to new books, although this effect merely reached a marginal significance. Overall, these findings provide unique evidence for the effects of dialogic reading on promoting verbal interaction in children with autism and have great implications for intervention practices.

Comorbidity Between Hikikomori and Autistic Traits May Be Identified as a Phenotypical Presentation Characterized by Greater Severity

Objectives: Hikikomori is a condition characterized by extreme social withdrawal, functional impairment, and mental distress, which has gained increasing recognition worldwide. While it can be associated with comorbid psychiatric disorders, hikikomori shares similarities with autism spectrum, prompting investigations into their relationship. Given that hikikomori commonly manifests in early adulthood, this study aimed to explore the relationship between autistic features and hikikomori tendencies among university students. Methods: A total of 2037 university students were recruited via an online survey and assessed with the Adult Autism Subthreshold (AdAS) Spectrum and the Hikikomori Questionnaire (HQ-25). Participants were categorized into four groups: healthy controls (HCs), subjects with hikikomori tendencies (HKs), subjects with significant autistic traits (ATs), and subjects with both significant ATs and hikikomori tendencies (AT-HKs). Results: Results showed significant effects of both hikikomori presence and significant ATs on AdAS Spectrum and HQ-25 scores, while a significant effect of their interaction was detected on AdAS Spectrum scores. The AT-HK group consistently scored higher on both AdAS Spectrum and HQ-25 compared to other groups, with the AT and HK groups outperforming HCs in specific domains. HQ-25 Socialization and Isolation domains predicted higher AdAS Spectrum scores in hikikomori subjects, while various AdAS Spectrum domains served as predictors of HQ-25 scores in AT subjects. Conclusions: This study highlights a significant relationship between ATs and hikikomori tendencies in university students, suggesting that their comorbidity may represent a more severe phenotype, where each condition may exacerbate the other.

Exploring Tactile Initiation of Joint Attention in Autistic Children

Initiation of joint attention (IJA) is often impaired in children who may be diagnosed with autism spectrum disorder (ASD). Traditionally, assessments of IJA have focused on visual and auditory means of communication. Recent research has expanded the understanding of joint attention to include tactile interactions. To investigate the early development of IJA in toddlers, particularly focusing on the differences in sensory modalities, we conducted a prospective study tracking 60 toddlers (30 males) up to 36 months of age, including 16 who were later diagnosed with ASD. We used videos taken during the administration of Communication and Symbolic Behavior Scales-Developmental Profile to code for IJA corresponding to different sensory modalities. During the second year of life, autistic children displayed lower frequencies of visual, auditory, and combined visual-auditory IJA compared to typically developing peers. Conversely, autistic children exhibited higher frequencies of tactile IJA. Notably, the frequencies of tactile IJA at 12 months were correlated with social symptoms at 24 months, showing a positive correlation across all participants and a negative correlation specifically within the ASD group. These results suggest that differences in the use of different sensory modalities of IJA may influence the development of future social communication abilities. Clinical Trial Registration: www.chictr.org.cn , identifier ChiCTR2100049811, 2021-08-10.

Mechanisms of Altered Imitation in Autism Spectrum Disorders

Imitation plays a critical role in enhancing social reciprocity and social/non-social skill learning. Accordingly, impaired imitation may have downstream implications on skill acquisition in autism. Social, motor, representational, and executive processes contribute to imitation performance, but it is unknown the degree to which differences in these domains contribute to imitation differences in autism. In the present study, we evaluated the role of various psychological mechanisms of autism-related imitation differences using mediation models. We assessed autistic and non-autistic 7-12-year-old children (n = 708) with FSIQ ≥ 80, using a wide battery of performance-based and parent-report tests that measured meaningful and non-meaningful gesture imitation performance, motor execution, action representation, social motivation, and executive function processes. Multiple marginal mediation analyses revealed that motor execution tests most strongly mediated imitation deficits in autism, though effects from social motivation, action representation, and executive function also partially mediated the relationship between autism diagnosis and imitation performance. Using cross-validated regression models, the domains tested here accounted for 39% of the variation in imitation performance. Results are contextualized across a broad range of experimental and observational studies with respect to the prompted imitation task utilized here. Future research will require longitudinal data, particularly from earlier stages of development.

Improving social-emotional abilities in children with profound intellectual and multiple disabilities through a person-centred eye-tracking-based training: A pilot study

Individuals with profound intellectual and multiple disabilities (PIMD) are characterized by a combination of a profound intellectual disabilities and a profound motor disability frequently associated with a number of additional severe secondary disabilities or impairments. The aim of this pilot study was to evaluate the effects of an innovative person-centred training based on eye-tracking computerised serious games on the social-emotional abilities in these individuals with PIMD. Nine participants aged 7-18 years were followed over a period of 1 year. A pre-test (T1) - training - post-test (T2) design was used. During T1 and T2, visual attention and six social-emotional abilities (preferential attention to biological motion, social orienting, facial expression exploration, emotional faces discrimination, joint attention and socio-moral evaluations) were assessed using an eye-tracking-based experimental paradigm combining various visual preference tasks. During the training, each participant benefited from personalized one-to-one sessions tailored to their skills based on results of T1 and the observations of their practitioners. To implement person-centred training, the experimenter chose from a set of serious games to train these social-emotional abilities, those he felt were best suited to the participant's current state of heath and alertness, personal skills and specific needs. All participants improved their visual exploration between T1 and T2. In addition, they all made progress on at least one of the six social-emotional competencies. These results showed preliminary evidence that it is possible to increase some social-emotional abilities in these individuals with an adapted training, thus indicating that they also have unsuspected learning abilities.

Altered Neural Activity in the Mesoaccumbens Pathway Underlies Impaired Social Reward Processing in Shank3-Deficient Rats

Social behaviors are crucial for human connection and belonging, often impacted by conditions like Autism Spectrum Disorder (ASD). The mesoaccumbens pathway (ventral tegmental area (VTA) to the nucleus accumbense (NAc)) plays a pivotal role in social behavior and is implicated in ASD. However, the impact of ASD-related mutations on social reward processing remains insufficiently explored. This study focuses on the Shank3 mutation, associated with a rare genetic condition and linked to ASD, examining its influence on the mesoaccumbens pathway during behavior, using the Shank3-deficient rat model. Our findings indicate that Shank3-deficient rats exhibit atypical social interactions, associated with altered neuronal activity of VTA dopaminergic and GABAergic neurons and reduced dopamine release in the NAc. Moreover, they demonstrate that manipulating VTA neuronal activity can normalize this behavior, providing insights into the effects of Shank3 mutations on social reward processing  and identifying a potential neural pathway for intervention.

Neurexin1α knockout in rats causes aberrant social behaviour: relevance for autism and schizophrenia

RATIONALE

Genetic and environmental factors cause neuropsychiatric disorders through complex interactions that are far from understood. Loss-of-function mutations in synaptic proteins like neurexin1α have been linked to autism spectrum disorders (ASD) and schizophrenia (SCZ), both characterised by problems in social behaviour. Childhood social play behaviour is thought to facilitate social development, and lack of social play may precipitate or exacerbate ASD and SCZ.

OBJECTIVE

To test the hypothesis that an environmental insult acts on top of genetic vulnerability to precipitate psychiatric-like phenotypes. To that aim, social behaviour in neurexin1α knockout rats was assessed, with or without deprivation of juvenile social play. We also tested drugs prescribed in ASD or SCZ to assess the relevance of this dual-hit model for these disorders.

RESULTS

Neurexin1α knockout rats showed an aberrant social phenotype, with high amounts of social play, increased motivation to play, age-inappropriate sexual mounting, and an increase in general activity. Play deprivation subtly altered later social behaviour, but did not affect the phenotype of neurexin1α knockout rats. Risperidone and methylphenidate decreased play behaviour in both wild-type and knockout rats. Amphetamine-induced hyperactivity was exaggerated in neurexin1α knockout rats.

CONCLUSION

Deletion of the neurexin1α gene in rats causes exaggerated social play, which is not modified by social play deprivation. This phenotype therefore resembles disinhibited behaviour rather than the social withdrawal seen in ASD and SCZ. The neurexin1α knockout rat could be a model for inappropriate or disinhibited social behaviour seen in childhood mental disorders.

Social interaction as a unique form of reward - Insights from healthy ageing and frontotemporal dementia

The drive for positive social interactions, or "social rewards", is an important motivator of human behaviour, conferring several adaptive benefits. Social motivation fluctuates across the lifespan, reflecting changes in goals and priorities at different developmental stages. In older adulthood, for instance, priorities tend to shift toward maintaining emotional wellbeing and resources over seeking novel gains. Contemporary theories of social interaction must account for such motivational shifts, addressing the enhancement of social processing in ageing and its decline in dementia. Here, we propose a framework to track the evolution of social motivation across the lifespan, focusing on three mechanisms: (i) social interactions as rewards, (ii) learning from social interactions, and (iii) the effort required for social interactions. We posit that social rewards hold equivalent or increased value later in life, enhancing older adults' social connections. Conversely, social rewards become devalued in neurodegenerative disorders such as frontotemporal dementia (FTD), resulting in social withdrawal. This integrative framework serves as a foundation for understanding adaptive and maladaptive trajectories of social motivation throughout the adult lifespan.

A molecularly defined mPFC-BLA circuit specifically regulates social novelty preference

Social novelty preference is an important aspect of social interaction for evaluating new threats and opportunities for survival, but the underlying neuronal mechanism remains unclear. Here, we identify a molecularly defined medial prefrontal cortex (mPFC) excitatory neuron subtype, located in layer 5 expressing Il1rapl2, which is highly associated with social deficit disorders in genome-wide association studies and might be responsible for regulating social novelty preference. Using an Il1rapl2-Cre mouse line, we show that chemogenetic activation of the mPFC Il1rapl2-expressing neurons impairs social novelty preference but with little effect on sociability. In addition, fiber photometry recording indicates that this neuron subtype is inhibited when mice interact with novel but not with familiar mice. Furthermore, viral tracing and terminal manipulation reveal that basolateral amygdala (BLA)-projecting Il1rapl2+ neurons mediate the social novelty preference. Thus, our study uncovers a molecularly defined mPFC-BLA circuit that specifically regulates social novelty preference, highlighting that specific neuron subtypes and circuits could modulate distinct aspects of social behaviors.

Caught in the Web of the Net? Part I: Meta-analyses of Problematic Internet Use and Social Media Use in (Young) People with Autism Spectrum Disorder

This article examined the internet and social media usage among (young) individuals with autism spectrum disorder (ASD). Two meta-analyses were conducted to quantify (1) the relation between ASD/autistic traits and problematic internet use (PIU, which included generalized PIU, problematic gaming, excessive smartphone use), and (2) the relation between ASD/autistic traits and social media use. The results of our first meta-analysis-comprising 46 studies and 42,274 participants-revealed that people with ASD or higher levels of autistic traits showed higher levels of PIU, with an average effect size of r = 0.26 (95% CI [0.21, 0.31]). The second meta-analysis-consisting of 15 studies and 7036 participants-indicated that people with ASD or higher levels of autistic traits were less involved on social media platforms as compared to their typically developing counterparts, with the average effect size being r = - 0.28 (95% CI [- 0.38, - 0.18]). The quality of the research on PIU and social media in persons with ASD was critically evaluated and possible directions for future research on this topic are discussed.

Mapping the landscape of social behavior

Social interaction is integral to animal behavior. However, lacking tools to describe it in quantitative and rigorous ways has limited our understanding of its structure, underlying principles, and the neuropsychiatric disorders, like autism, that perturb it. Here, we present a technique for high-resolution 3D tracking of postural dynamics and social touch in freely interacting animals, solving the challenging subject occlusion and part-assignment problems using 3D geometric reasoning, graph neural networks, and semi-supervised learning. We collected over 110 million 3D pose samples in interacting rats and mice, including seven monogenic autism rat lines. Using a multi-scale embedding approach, we identified a rich landscape of stereotyped actions, interactions, synchrony, and body contacts. This high-resolution phenotyping revealed a spectrum of changes in autism models and in response to amphetamine not resolved by conventional measurements. Our framework and large library of interactions will facilitate studies of social behaviors and their neurobiological underpinnings.

Emotional Prosody Recognition in Autism Spectrum Disorder Without Intellectual Disability: A Systematic Review and Meta-Analysis

Emotional prosody recognition is vital for social interaction and has become a key focus in autism research. However, findings regarding emotional prosody recognition in individuals with autism spectrum disorder without intellectual disability (ASD-without-ID) remain inconsistent. This study aims to address this inconsistency through a systematic review and meta-analysis, exploring potential factors that may account for the inconsistent results. A search across four major electronic databases identified 29 eligible studies comparing emotional prosody recognition in ASD-without-ID and typically developing (TD) participants. We identified several participant- and methodology-related moderators across these studies. Using a random-effects model, we found a moderate-to-large pooled effect (Hedges' g = - 0.65) for emotional prosody recognition in ASD-without-ID participants, which remained stable after adjusting for publication bias through the trim-and-fill method. Emotional complexity and participant age significantly moderated the heterogeneity of effect sizes across studies. The results indicate moderate differences in the recognition of basic emotions through prosody between individuals with ASD-without-ID and TD individuals, with more pronounced differences for complex emotions. The findings emphasize the distinct developmental trajectories of ASD-without-ID individuals. We highlight the need for further investigation into the underlying factors and mechanisms affecting emotional prosody recognition in this population, including meta-analyses examining the moderate effects of various IQ measures and studies involving speakers of tonal languages.

Learning in the face of failure: The benefit of autistic traits

This study aims to explore how learning performance differs for non-diagnosed adults with high and low levels of autistic traits (ATs) for positive versus negative feedback delivered via social and nonsocial stimuli. College student participants were tested on their ability to learn novel words (i.e., Korean characters) in a simple memory experiment incorporating either positive or negative feedback. A 2 (positive feedback vs. negative feedback) × 2 (ATs: high vs. Low) between-subject design was adopted in both Experiments 1 and 2. Social feedback stimuli were used in Experiment 1 and nonsocial feedback stimuli were used in Experiment 2. The results revealed that individuals with both high and low levels of ATs showed learning for both types of feedback (success and failure) using social and nonsocial stimuli (Experiments 1 and 2, respectively). However, individuals with low levels of ATs learned less from failure than from success, whereas individuals with high levels of ATs showed equivalent learning for failure and success, for both social and nonsocial stimuli. These results suggest that for college students, a benefit of having high levels of ATs is increased resilience and an ability to continue to learn in the face of failure.

Translational research approach to social orienting deficits in autism: the role of superior colliculus-ventral tegmental pathway

Autism Spectrum Disorder (ASD) is characterized by impairments in social interaction and repetitive behaviors. A key characteristic of ASD is a decreased interest in social interactions, which affects individuals' ability to engage with their social environment. This study explores the neurobiological basis of these social deficits, focusing on the pathway between the Superior Colliculus (SC) and the Ventral Tegmental Area (VTA). Adopting a translational approach, our research used Shank3 knockout mice (Shank3-/-), which parallel a clinical cohort of young children with ASD, to investigate these mechanisms. We observed consistent deficits in social orienting across species. In children with ASD, fMRI analyses revealed a significant decrease in connectivity between the SC and VTA. Additionally, using miniscopes in mice, we identified a reduction in the frequency of calcium transients in SC neurons projecting to the VTA, accompanied by changes in neuronal correlation and intrinsic cellular properties. Notably, the interneuronal correlation in Shank3-/- mice and the functional connectivity of the SC to VTA pathway in children with ASD correlated with the severity of social deficits. Our findings underscore the potential of the SC-VTA pathway as a biomarker for ASD and open new avenues for therapeutic interventions, highlighting the importance of early detection and targeted treatment strategies.

Neural control of sex differences in affiliative and prosocial behaviors

Social interactions are vital for various taxa and species. Prosocial and affiliative dynamics within a group and between individuals are not only pleasurable and rewarding, but also appear to actively contribute to well-being, cognitive performance, and disease prevention. Moreover, disturbances in acting or being prosocial can represent a major burden for an individual and their affective partners. These disruptions are evident across a spectrum of neuropsychiatric conditions, including depression and autism spectrum disorders. Importantly, interactive patterns of prosocial and affiliative behavior can vary with sex. The fact that genders are differentially affected by neuropsychiatric disorders associated with social impairment underscores the high importance of this research in uncovering the underlying neural correlates and mechanisms. This review focuses on elucidating sex-related differences in prosocial and affiliative behaviors and their potential association with sexually different neural correlates. Specifically, we aim to shed light on the complex interplay between sex, behavior, and neurobiology in affiliative and prosocial interaction patterns.

'I did what I could to earn some money and be of use': A qualitative exploration of autistic people's journeys to career success and fulfilment

Employment contributes to well-being, yet many autistic people who want to work face barriers to meaningful employment. Much research focuses solely on employment rates, rather than taking a more holistic view of professional trajectories and occupational experiences. We conducted semi-structured interviews with 18 autistic adults to explore their experiences of, and perspectives on, career success. Our participants highlighted the overarching importance of finding fulfilment in one's career. Using reflexive thematic analysis, we identified five additional key themes: (1) volatile career journeys, (2) the need for continuing career support, (3) the impact (positive or negative) of social interactions, (4) the important role of organisations and (5) the catastrophic impact of poor experiences. Our findings highlight the importance of tailored, lifelong employment support and inclusive workplaces in enabling autistic people to thrive at work. Enabling autistic career fulfilment requires moving beyond entry-level hiring to foster sustainable, fulfilling employment for all autistic people.Lay abstractMany autistic people want to work but have trouble finding jobs they like and can stick with. Most research tries to help more autistic people get jobs, but does not look at whether those jobs are fulfilling, or how people progress once they start working. We spoke to 18 autistic people about their experiences at work, and their ideas about success at work. Participants said finding fulfilment in their careers was key. We found five common 'themes' across the interviews. First, autistic people's careers often take unexpected turns. For example, many participants only got diagnosed as adults, which sometimes changed their work plans. Second, autistic people might need ongoing help with their career, including help with finding jobs they would enjoy and be good at, and advice on how to progress in their job. Third, getting along with others at work is really important. Having supportive colleagues helped our participants thrive, but workplace bullying forced some to leave their jobs. Fourth, workplaces need to be welcoming to everybody. Adjustments and understanding managers helped, but many of our participants' workplaces were not inclusive. Finally, bad work experiences can be devastating for mental health and well-being and negative experiences like bullying led some participants to quit working entirely. Our findings show that lifelong support tailored to each person and welcoming workplaces are important for autistic people to thrive at work. It is not enough to just hire autistic people - we need to help them have jobs they like and can stick with long-term.

11C-UCB-J PET imaging is consistent with lower synaptic density in autistic adults

The neural bases of autism are poorly understood at the molecular level, but evidence from animal models, genetics, post-mortem studies, and single-gene disorders implicate synaptopathology. Here, we use positron emission tomography (PET) to assess the density of synapses with synaptic vesicle glycoprotein 2A (SV2A) in autistic adults using 11C-UCB-J. Twelve autistic (mean (SD) age 25 (4) years; six males), and twenty demographically matched non-autistic individuals (26 (3) years; eleven males) participated in a 11C-UCB-J PET scan. Binding potential, BPND, was the primary outcome measure and computed with the centrum semiovale as the reference region. Partial volume correction with Iterative Yang was applied to control for possible volumetric differences. Mixed-model statistics were calculated for between-group differences. Relationships to clinical characteristics were evaluated based on clinician ratings of autistic features. Whole cortex synaptic density was 17% lower in the autism group (p = 0.01). All brain regions in autism had lower 11C-UCB-J BPND compared to non-autistic participants. This effect was evident in all brain regions implicated in autism. Significant differences were observed across multiple individual regions, including the prefrontal cortex (-15%, p = 0.02), with differences most pronounced in gray matter (p < 0.0001). Synaptic density was significantly associated with clinical measures across the whole cortex (r = 0.67, p = 0.02) and multiple regions (rs = -0.58 to -0.82, ps = 0.05 to <0.01). The first in vivo investigation of synaptic density in autism with PET reveals pervasive and large-scale lower density in the cortex and across multiple brain areas. Synaptic density also correlated with clinical features, such that a greater number of autistic features were associated with lower synaptic density. These results indicate that brain-wide synaptic density may represent an as-yet-undiscovered molecular basis for the clinical phenotype of autism and associated pervasive alterations across a diversity of neural processes.

A Pilot Randomized Controlled Trial of Motivation-Based Social Skills Group Treatment with Parent Training

Despite the popularity of social skills groups, there remains a need for empirical investigation of treatment effects, especially when targeting pivotal aspects of social functioning such as initiations to peers. The goal of the present study was to conduct a randomized controlled trial of a 12-week social intervention (SUCCESS), which combined an inclusive social group with a parent education program. Twenty-five 4- to 6-year-olds with Autism Spectrum Disorder (ASD) were randomized to SUCCESS (N = 11) or to treatment as usual (N = 14). Combining a peer group model with a parent training program, the SUCCESS intervention used naturalistic behavioral techniques (e.g., environmental arrangement, natural reinforcement) to increase social initiations to peers. After 12 weeks, children participating in the SUCCESS program made more frequent initiations to peers than children in the treatment-as-usual group, including more prompted and unprompted initiations to request. Additional gains in clinician-rated social functioning were observed in children randomized to SUCCESS, while differential treatment effects were not detected in parent-rated measures. However, lower baseline social motivation was associated with greater parent-reported initiation improvement. This study provides preliminary support for the efficacy of a naturalistic, behavioral social skills intervention to improve peer initiations for children with ASD. The findings suggest that using a motivation-based social skills group was effective in increasing both prompted and spontaneous initiations to peers, and highlights the need for further research into the role of baseline social motivation in predicting social skills treatment response.

A review of the effects of different types of social behaviors on the recruitment of neuropeptides and neurotransmitters in the nucleus accumbens

There is a lack of understanding of the neural mechanisms regulating the rewarding effects of social interactions. A significant contributor to this lack of clarity is the diversity of social behaviors and animal models utilized to investigate mechanisms. Other sources of the lack of clarity are the diversity of brain regions that can regulate social reward and the diversity of signaling pathways that regulate reward. To provide some clarity into the mechanisms of social reward, this review focused on the brain region most implicated in reward for multiple stimuli, the nucleus accumbens, and surveyed (systematically reviewed) studies that investigated the relationship between social interaction and five signaling systems implicated in the regulation of reward and social behavior: oxytocin, vasopressin, serotonin, opioids and endocannabinoids. Moreover, all of these studies were organized by the type of social behavior studied: affiliative interactions, play behavior, aggression, social defeat, sex behavior, pair-bonding, parental behavior and social isolation. From this survey and organization, this review concludes that oxytocin, endocannabinoids and mu-opioid receptors in the nucleus accumbens positively regulate the rewarding social behaviors, and kappa-opioid receptors negatively regulate the rewarding social behaviors. The opposite profile is observed for these signaling systems for the aversive social behaviors. More studies are needed to investigate the directional role of the serotonin system in the nucleus accumbens in the regulation of many types of social behaviors, and vasopressin likely does not act in the nucleus accumbens in the regulation of the valence of social behaviors. Many of these different signaling systems are also interdependent of one another in the regulation of different types of social behaviors. Finally, the interaction of these signaling systems with dopamine in the nucleus accumbens is briefly discussed.

Initial study of verbal and nonverbal communication training through the collaborative operation of a humanoid robot for individuals with autism spectrum disorder

Individuals with autism spectrum disorder (ASD) experience difficulties in both verbal and nonverbal communication. Collaborative work allows them to use and develop their nonverbal communication abilities. Therefore, we developed a collaborative work training program for individuals with ASD. This study aimed to assess the feasibility of the proposed intervention for both verbal and nonverbal communication. A single humanoid robot was operated by two people, with each person operating different parts of the robot: one person moved the right half of the body while the other moved the left. The participants' roles were separated to promote verbal and nonverbal communication. Fourteen individuals (aged 18-27 years) participated in a training experiment that was conducted once a week for a maximum of seven sessions over two months. A comparison of the amount of communication between the first and last training sessions showed that both verbal and nonverbal communication increased (p=0.044 and p=0.024, respectively), indicating that the proposed training facilitated both verbal and nonverbal communication. Future studies are needed to establish evidence supporting the generalizability of the acquired skills to daily life activities by considering longitudinal designs.

Gamified Mobile Health Strategies for Promoting Physical Activity in Autistic Adults

Physical inactivity and sedentarism among autistic adults are a growing public health concern. By integrating behavior change theories and emphasizing unique preferences for visuospatial learning and gaming technology, we hypothesize that gamified mobile health (mHealth) applications can be effective at increasing free-living physical activity and reducing sedentary behavior in autistic adults.

Preference for Social Motion in Autistic Adults

Autism is often linked to attenuated social attention, including a lowered looking preference for biological motion in autistic compared to non-autistic children. This looking preference has been suggested as an autism marker in childhood. However, few studies have investigated whether this bias persists into adulthood. Furthermore, the underlying cognitive mechanism of this group difference is largely unknown. Pupillary responses have been established as an index of salience processing and are thus a promising measurement of the cognitive bases of looking preference. The present study examined differences in looking preference and pupillary responses to social versus geometric motion between autistic and non-autistic adults (N = 66). In terms of preference, autistic adults demonstrated a reduced spontaneous looking toward social stimuli compared to the non-autistic group. Whereas the former displayed no clear preference for either motion type, the latter showed a strong preference for social motion. In terms of pupillary responses, the autistic group showed faster and larger pupil dilation for social motion compared to the non-autistic group, which indicated heightened cognitive effort and arousal. These results suggest persistent differences in social attention across the developmental lifespan in autism.

Reduced attention to human eyes in autism-associated Shank3 mutant laboratory beagle dogs

Autistic individuals often exhibit reduced attention to faces and eyes, which may underlie their social difficulty. This study used eye-tracking techniques to explore visual attention towards faces in Shank3 mutant laboratory beagle dogs, a model for autism, to identify parallels with human autism. We first assessed visual attention differences towards the eyes between Shank3 mutant and wild-type (WT) laboratory beagles by presenting them with human and dog face images. Then, using the gaze cueing paradigm, we directed the dogs' gaze towards the eyes and mouth and quantified their gaze shifts. Finally, we investigated the impact of oxytocin on eye-gaze behavior by comparing gaze patterns under pre-administration, vehicle, and oxytocin conditions while viewing human faces. We found that mutant dogs showed a reduced proportional viewing time of human eyes than WT dogs (p = 0.032), but no difference in proportional eye viewing time when viewing dog faces (p = 0.691). Mutant dogs shifted their gazes away from the human eyes more quickly than the mouth (p = 0.043), unlike WT dogs (p = 0.345), suggesting an active eye avoidance. Furthermore, exogenous oxytocin increased proportional viewing time on human eyes in mutant dogs than pre-administration and vehicle conditions (p = 0.022), suggesting a potential effect of oxytocin on social attention in autism. To our knowledge, this study is the first to report an eye avoidance phenotype in an animal model of autism. These findings contribute to our understanding of the mechanisms underlying social difficulties in autism and the development of supporting strategies for autism.

Predictive effects of daily sleep on social motivation and social activity

This study examined the predictive effect of day-to-day variations in sleep on self-reported social motivation and social activity in 126 parents of young children with sleep problems. Controlling for other sleep factors, worse subjective sleep quality predicted less morning sociability and social motivation throughout the day. Unexpectedly, longer sleep duration predicted less social activity the following day. Sleepiness at wakeup predicted morning sociability, but not social motivation or activity throughout the day. This highlights the importance of good sleep quality for motivation to socialize, but also the complexity of investigating the relationship between sleep and social measures in daily life.

Is There a Core Deficit in Autism Spectrum Disorder? An Analysis of CPEP-3 Assessment Data from 543 Children With Autism

Identifying a "core deficit" is essential for early detection and intervention in developmental disorders among children. However, the presence of a core deficit within autism spectrum disorder (ASD) continues to be unclear. Therefore, the purpose of this study was to examine the possibility of the core deficit in autism spectrum disorders. This study evaluated 543 children diagnosed with ASD by using Chinese version of the Psychoeducational Profile-Third Edition (CPEP-3). Structural equation modeling (SEM) was used to construct single-factor models (assuming the presence of a core deficit) and a multi-factor model (assuming the absence of core deficits) based on the assessed data, and then to compare the fit of the two types of models. Assessments revealed developmental delays and adaptive challenges among the children with ASD. The single-factor model assuming the "motor" domain as the "core deficit" showed a superior fit (CFI = 0.86, AIC = 356.47, ECVI = 0.66) than other single-factor models. The multi-factor model, which assumes no core deficit, provided a better fit and greater predictive accuracy (CFI = 0.87, AIC = 351.94, ECVI = 0.65) than all single-factor models. ASD is characterized by widespread developmental delays and adaptive challenges. While motor impairment may serve as an effective predictor of these issues, it does not fully account for the diverse and complex symptomatology observed in children with ASD. The symptoms in these children likely arise from multiple factors, which are not adequately explained by a single core deficit model.

Parsing the heterogeneity of social motivation in autism

BACKGROUND

Social motivation is posited as a key factor in the expression of the autism phenotype. However, lack of precision in both conceptualization and measurement has impeded a thorough understanding of its diverse presentation and associated outcomes. This study addresses this gap by identifying subgroups of autism characterized by deficits in distinct facets of social motivation, relative to normative benchmarks.

METHODS

Data were from 509 participants with autism, aged 5-to-21 years (M = 10.43, SD = 3.67; 81% male), enrolled in the Healthy Brain Network. Latent profile analysis was employed to identify subgroups characterized by unique configurations of reticence, seeking, and maintaining facets of social motivation, derived from a comprehensive multi-instrument factor analysis of symptom and screening measures. Pearson's chi-square tests and one-way analysis of variance were performed to explore subgroup differences in demographic characteristics, cognitive abilities, co-occurring psychopathologies, and other aspects of social functioning.

RESULTS

Four distinct subgroups were identified: Engaged (n = 247), exhibiting the fewest challenges across each area; Inhibited (n = 143), characterized by high reticence, mild challenges in seeking, and few challenges in maintaining; Aloof (n = 68), characterized by challenges with seeking and maintaining but relatively low reticence; and Avoidant (n = 52), characterized by the highest challenges across all areas. Subgroups did not differ in terms of chronological age or sex. The Engaged subgroup exhibited the fewest challenges in other aspects of social functioning and co-occurring psychopathologies, while the Avoidant subgroup exhibited the greatest challenges, and with the Inhibited and Aloof profiles falling in between.

CONCLUSIONS

This study highlights the heterogeneous nature of deficits in social motivation in autism relative to normative benchmarks, suggesting potential avenues for tailored interventions aimed at addressing the specific challenges experienced by individuals within each subgroup. Nevertheless, there remains a need to develop more refined measurement tools capable of capturing even finer-grained aspects and diverse expressions of social motivation, facilitating further characterization of individual differences across diagnostic boundaries.

Autism, Personality Pathology, and the Neural Response to Rewards

The autism social motivation hypothesis suggests that diminished reward value of social stimuli contributes to deficits in social motivation. Research indicates that autistic individuals show decreased neural responding to both social and non-social reward, suggesting domain-general reward system differences. However, autism is heterogenous with extensive co-occurring psychopathology, and the autism phenotype may not be the best way to understand its relationship with neural reward response. Autism has been associated with normative and pathological personality domains that may better represent the heterogeneity and comorbidity of autism. The present study examined associations between autism traits, pathological personality, and the neural response to multiple reward types. The sample included 18-33-year-old undergraduates who completed monetary, social, and restricted interests reward tasks while we recorded electroencephalography to measure the reward positivity (RewP), an event-related potential indicator of reward sensitivity. Participants completed self-report measures of autism traits and the pathological personality traits negative emotionality, detachment, and anankastia. Autism traits were not directly related to the RewP but were positively associated with pathological personality dimensions. Across all reward tasks, negative emotionality was related to a larger RewP while detachment and anankastia were related to a smaller RewP. All three pathological personality dimensions mediated the relationship between autism traits and the RewP. The present study suggests that autism and neural reward response is at least partially mediated by comorbid psychopathology. Moreover, the results are inconsistent with the social motivation hypothesis and instead suggest that autism is linked to domain-general neural response to rewards.

The developing visual system: A building block on the path to autism

Longitudinal neuroimaging studies conducted over the past decade provide evidence of atypical visual system development in the first years of life in autism spectrum disorder (ASD). Findings from genomic analyses, family studies, and postmortem investigations suggest that changes in the visual system in ASD are linked to genetic factors, making the visual system an important neural phenotype along the path from genes to behavior that deserves further study. This article reviews what is known about the developing visual system in ASD in the first years of life; it also explores the potential canalizing role that atypical visual system maturation may have in the emergence of ASD by placing findings in the context of developmental cascades involving brain development, attention, and social and cognitive development. Critical gaps in our understanding of human visual system development are discussed, and future research directions are proposed to improve our understanding of ASD as a complex neurodevelopmental disorder with origins in early brain development.

Single-Cell Resolution of Individual Variation in Hypothalamic Neurons Allows Targeted Manipulation Affecting Social Motivation

Despite decades of research, connecting molecular and cellular phenotypes to complex behavioral traits remains an elusive goal1. Social motivation exhibits individual trait variation2, which we hypothesize is mediated by molecular and cellular variability across hypothalamic neurons. To test this, we generated single-nucleus RNA-sequencing profiles3,4 of >120,000 neurons from tuberal hypothalamus and adjacent thalamus in 36 mice, balanced across sex and autism-associated mutation5, with all mice assessed for social motivation2. First, we show that molecular activation patterns predict behavior across individuals: specifically, activation of paraventricular Agtr1a+ (angiotensin receptor 1a) neurons predicted reduced social behavior. Subsequent inhibition of AGTR1A with telmisartan-an FDA-approved antihypertensive6-improved social orienting. Second, we show natural variation in neuronal proportions-likely arising from stochastic developmental events7-is sufficient to shape adult behavior even among genetically-identical individuals: we identified multiple neuronal populations whose relative abundance predicted social reward-seeking behavior. Chemogenetic inhibition of one such population, Nxph4+ neurons of the postero-lateral hypothalamus8, suppressed multiple aspects of social motivation. This work establishes proof-of-principle for an approach where single-cell genomics precisely maps neural substrates governing behavior. This approach revealed that stochastic variations in neuronal architecture deterministically influence social motivation, and enabled identification of therapeutically-actionable targets with immediate translational potential for disorders with social deficits.

Weak ties and the value of social connections for autistic people as revealed during the COVID-19 pandemic

A diverse portfolio of social relationships matters for people's wellbeing, including both strong, secure relationships with others ('close ties') and casual interactions with acquaintances and strangers ('weak ties'). Almost all of autism research has focused on Autistic people's close ties with friends, family and intimate partners, resulting in a radically constrained understanding of Autistic sociality. Here, we sought to understand the potential power of weak-tie interactions by drawing on 95 semi-structured interviews with Autistic young people and adults conducted during the COVID-19 pandemic. We analysed the qualitative data using reflexive thematic analysis within an essentialist framework. During the COVID-19 lockdowns, Autistic people deeply missed not only their close personal relationships but also their "incidental social contact" with acquaintances and strangers. These weak-tie interactions appear to serve similar functions for Autistic people as they do for non-autistic people, including promoting wellbeing. These findings have important implications both for future research into Autistic sociality and for the design of practical services and supports to enhance Autistic people's opportunities to flourish.

Is the social withdrawal subscale a valid instrument to assess social withdrawal among colorectal cancer survivors with permanent stomas? A validation study

BACKGROUND

Although social withdrawal is common among colorectal cancer (CRC) survivors with permanent stomas, it has been poorly addressed due to a lack of valid assessment tools. The social withdrawal subscale (SWS) from the Internalized Stigma of Mental Illness (ISMI) scale shows promise for assessing social withdrawal. However, there was no available data on its validity for this purpose. This study aimed to investigate the reliability and validity of the SWS as a screening tool for identifying survivors at risk of social withdrawal.

METHODS

Two separate convenience samples of 127 and 245 CRC survivors with permanent stomas were selected. Item analysis and exploratory factor analysis (EFA) were conducted with the first sample of 127 survivors. Confirmatory factor analysis (CFA), reliability analysis, and tests for convergent and discriminant validity were performed with the second sample of 245 survivors. Additionally, the screening cut-off score and accuracy of the SWS scores were determined using receiver operating characteristic (ROC) curves.

RESULTS

The item-total correlation coefficients of the SWS ranged from 0.530 to 0.787. The EFA demonstrated a single-factor structure for the SWS. The CFA confirmed appropriate construct validity (χ²/df = 103.115/52 = 1.983, goodness-of-fit index (GFI) = 0.925, comparative fit index (CFI) = 0.959, and root mean square error of approximation (RMSEA) = 0.068). The test-retest reliability was 0.849. Pearson correlation analysis showed significant and moderate to large relationships between the SWS and the chosen criterion measures, supporting its good convergent validity. ROC analysis identified SWS scores of ≥ 15 as the optimal screening cut-off, with a sensitivity of 86.5%, specificity of 50.5%, and an area under the curve (AUC) of 0.748 (95% CI: 0.673-0.823, P < 0.001).

CONCLUSION

The SWS demonstrates acceptable reliability and validity for measuring social withdrawal among CRC survivors with permanent stomas. Future studies should further evaluate its utility in clinical settings.

Short-term social isolation acts on hypothalamic neurons to promote social behavior in a sex- and context-dependent manner

Social animals, including both humans and mice, are highly motivated to engage in social interactions. Short-term social isolation promotes social behavior, but the neural circuits through which it does so remain incompletely understood. Here, we sought to identify neurons that promote social behavior in single-housed female mice, which exhibit increased rates of social investigation, social ultrasonic vocalizations (USVs), and mounting during same-sex interactions that follow a period of short-term (3 days) isolation. We first used immunostaining for the immediate early gene Fos to identify a population of neurons in the preoptic hypothalamus (POA) that increase their activity in single-housed females following same-sex interactions (POAsocial neurons) but not in single-housed females that did not engage in social interactions. TRAP2-mediated chemogenetic silencing of POAsocial neurons in single-housed females significantly attenuates the effects of short-term isolation on social investigation, USV production, and mounting. In contrast, caspase-mediated ablation of POAsocial neurons in single-housed females robustly attenuates mounting but does not decrease social investigation or USV production. Optogenetic activation of POAsocial neurons in group-housed females promotes social investigation and USV production but does not recapitulate the effects of short-term isolation on mounting. To understand whether a similar population of POAsocial neurons promotes social behavior in single-housed males, we performed Fos immunostaining in single-housed males following either same-sex or opposite-sex social interactions. These experiments revealed a population of POA neurons that increase Fos expression in single-housed males following opposite-sex, but not same-sex, interactions. Chemogenetic silencing of POAsocial neurons in single-housed males during interactions with females reduces mounting but does not affect social investigation or USV production. These experiments identify a population of hypothalamic neurons that promote social behavior following short-term isolation in a sex- and social context-dependent manner.

Vasopressin regulates social play behavior in sex-specific ways through glutamate modulation in the lateral septum

Understanding the neural basis of social play in juvenile rats may ultimately help restore social play deficits in autistic children. We previously found that administration of a vasopressin (AVP) V1a receptor (V1aR) antagonist into the lateral septum (LS) increased social play behavior in male juvenile rats and decreased it in females. Here, we demonstrate that glutamate, but not GABA, is involved in this sex-specific regulation. First, we found a sex difference in extracellular LS glutamate/GABA ratio (lower in females) that was eliminated by V1aR antagonist infusion in the LS that caused an increase in glutamate release in females only. Second, infusion of the glutamate receptor agonist L-glutamic acid into the LS mimicked the V1aR antagonist-induced decrease in female social play while preventing the increase in male social play. Third, infusion of the glutamate receptor antagonists AP-5 and CNQX into the LS prevented the V1aR antagonist-induced decrease in female social play. Fourth, there were no sex differences in extracellular GABA release in the LS upon either V1aR antagonist infusion or in social play expression upon infusion of the GABA-A receptor agonist muscimol into the LS, suggesting that GABA is not involved in the sex-specific regulation of social play by the LS-AVP system. Last, we found no sex differences in the type (GAD1/2, somatostatin, calbindin 1, Sox9) of V1aR-expressing LS cells, suggesting other cellular mechanisms mediating the sex-specific effects on glutamate release in the LS by the LS-AVP system. In conclusion, we demonstrate that the LS-AVP system regulates social play sex-specifically via glutamatergic neurotransmission. These findings have relevance for potential sex-specific effects of AVP-based treatment of social deficits in children.

Examining the Process and Impact of Social Problem Solving in Autistic Children

Social problem solving (SPS) represents a social cognitive reasoning process that gives way to behavior when individuals are navigating challenging social situations. Autistic individuals have been shown to struggle with specific aspects of SPS, which, in turn, has been related to social difficulties in children. However, no previous work has measured how SPS components not only relate to one another but also discretely and conjointly predict autism-related symptoms and social difficulties in autistic children, specifically. Fifty-eight autistic children (44 male; 6-10 years old, Mage=8.67, SDage=1.31) completed a self-administered, computerized assessment of SPS. To elucidate how SPS components discretely, and combined, contribute to autism-related symptoms and social difficulties, commonality analyses were conducted for each measure assessing autism-related symptoms and social difficulties. Socially normative problem identification, goal preference, and solution preference were related to fewer parent-reported autism-related social difficulties. Measures related to autism symptomatology, social perspective taking, and emotion recognition were not significantly associated with discrete SPS components in this sample. The problem identification aspect of SPS contributed the most unique variance to parent-reported autism-related social difficulties, while shared variance across all SPS components accounted for substantial variance in both parent-reported autism-related social difficulties models. Results suggest that SPS components are interrelated, but distinct, constructs in the autistic population. These findings not only further clarify the impact of SPS components on autism-related symptoms and social difficulties, but also have implications for refining SPS-focused interventions in the autistic population.

Social Anhedonia Accounts for Greater Variance in Internalizing Symptoms than Autism Symptoms in Autistic and Non-Autistic Youth

PURPOSE

Social anhedonia is a transdiagnostic trait that reflects reduced pleasure from social interaction. It has historically been associated with autism, however, very few studies have directly examined behavioral symptoms of social anhedonia in autistic youth. We investigated rates of social anhedonia in autistic compared to non-autistic youth and the relative contributions of autism and social anhedonia symptoms to co-occurring mental health.

METHODS

Participants were 290 youth (Mage=13.75, Nautistic=155) ranging in age from 8 to 18. Youth completed a cognitive assessment and a diagnostic interview. Their caregiver completed questionnaires regarding symptoms of autism and co-occurring psychiatric conditions.

RESULTS

Autistic youth were more likely to meet criteria for social anhedonia than non-autistic youth. There was a significant positive relationship between age and social anhedonia symptom severity, but there was no association between sex and social anhedonia. Dominance analysis revealed that social anhedonia symptom severity had the strongest association with symptoms of depression and social anxiety, while symptoms of ADHD, generalized anxiety, and separation anxiety were most strongly associated with autism symptom severity.

CONCLUSION

This was the first study to tease out the relative importance of social anhedonia and autism symptoms in understanding psychiatric symptoms in autistic youth. Findings revealed higher rates of social anhedonia in autistic youth. Our results indicate that social anhedonia is an important transdiagnostic trait that plays a unique role in understanding co-occurring depression and social anxiety in autistic youth. Future research should utilize longitudinal data to test the transactional relationships between social anhedonia and internalizing symptoms over time.

A systematic review: Which psycho-social-environmental factors do autistic students identify as being important for positive experiences in mainstream secondary school?

Mainstream secondary school can be a challenging environment for autistic students, in part due to social and sensory factors. Research to date has focussed on identifying the negative aspects of school experience; however, few studies have identified factors that promote positive experiences. We take a neuro-affirmative approach when exploring how schools can support autistic students, informed by both the social and the human rights models of disability. We conducted a systematic review of qualitative studies in which autistic adolescents and adults identified factors that related to positive experiences in mainstream secondary school. We identified 117 relevant studies and 36 met inclusion criteria. Through thematic synthesis, we developed overarching themes: 'Understanding and Acceptance', 'Environments that suit me' and 'Agency to meet my needs', with additional subthemes. This study identified that agency, understanding and acceptance by both staff and peers, as well as access to engaging activities, were key factors in creating a positive and supportive environment for autistic students. Adaptation to both the social and sensory contexts were important to meet the needs of autistic students. The findings suggest that policy and practice should focus on creating a positive environment in schools for autistic students, in addition to addressing current challenges.Lay abstractResearch has shown that many autistic students do not thrive in mainstream secondary schools. Often studies focus on the challenges autistic people face rather than what supports thriving. We reviewed published articles, exploring what factors helped autistic people create a positive experience in school from their own perspective. We identified 36 studies and analysed the direct quotes made by autistic adolescents and adults in these studies. Factors important for positive experience included the autistic student feeling understood and accepted by adults and peers in school, being able to shape sensory and social environments in ways that suited them and accessing engaging activities. This review highlighted ways in which schools can become more inclusive and positive environments for autistic students.

Autistic traits relate to reduced reward sensitivity in learning from point-light displays (PLDs)

A number of studies have linked autistic traits to difficulties in learning from social (versus non-social) stimuli. However, these stimuli are often difficult to match on low-level visual properties, which is especially important given the impact of autistic traits on sensory processing. Additionally, studies often fail to account for dissociable aspects of the learning process in the specification of model parameters (learning rates and reward sensitivity). Here, we investigate whether learning deficits in individuals with high autistic traits exhibit deficits when learning from facial point-light displays (PLDs) depicting emotional expressions. Social and non-social stimuli were created from random arrangements of the same number of point-lights and carefully matched on low-level visual properties. Neurotypical participants (N = 63) were assessed using the autism spectrum quotient (AQ) and completed a total of 96 trials in a reinforcement learning task. Although linear multi-level modelling did not indicate learning deficits, pre-registered computational modelling using a Rescorla-Wagner framework revealed that higher autistic traits were associated with reduced reward sensitivity in the win domain, demonstrating an attenuated response to received feedback during learning. These findings suggest that autistic traits can significantly impact learning from PLD feedback beyond a general deficit in learning rates.

Chromosomal and gonadal sex have differing effects on social motivation in mice

BACKGROUND

Sex differences in brain development are thought to lead to sex variation in social behavior. Sex differences are fundamentally driven by both gonadal hormones and sex chromosomes, yet little is known about the independent effects of each on social behavior. Further, mouse models of the genetic liability for the neurodevelopmental disorder MYT1L Syndrome have shown sex-specific deficits in social motivation. In this study, we aimed to determine if gonadal hormones or sex chromosomes primarily mediate the sex differences seen in mouse social behavior, both at baseline and in the context of Myt1l haploinsufficiency.

METHODS

Four-core genotypes (FCG) mice, which uncouple gonadal and chromosomal sex, were crossed with MYT1L heterozygous mice to create eight different groups with unique combinations of sex factors and MYT1L genotype. A total of 131 mice from all eight groups were assayed for activity and social behavior via the open field and social operant paradigms. Measures of social seeking and orienting were analyzed for main effects of chromosome, gonads, and their interactions with Myt1l mutation.

RESULTS

The FCGxMYT1L cross revealed independent effects of both gonadal and chromosomal sex on activity and social behavior. Specifically, the presence of ovarian hormones led to greater overall activity, social seeking, and social orienting regardless of MYT1L genotype. In contrast, sex chromosomes affected social behavior mainly in the MYT1L heterozygous group, with XX MYT1L mutant mice demonstrating elevated levels of social orienting and seeking compared to XY MYT1L mutant mice.

CONCLUSIONS

Gonadal and chromosomal sex have independent mechanisms of driving greater social motivation in females. Additionally, genes on the sex chromosomes may interact with neurodevelopmental risk genes to influence sex variation in atypical social behavior.

Gaze cues facilitate incidental learning in children aged 7-10 years, but arrow cues do not

From infancy, humans use gaze cues from others to learn about their surrounding environment. It is known that gaze cues facilitate the cognitive processing of targets in both infants and adults, but what developmental changes occur during childhood? This study investigated the impact of gaze cueing on incidental learning in children aged 7-10 years (n = 80). Participants completed a cueing task where they were presented with gaze or arrow cues (valid or invalid) followed by a target stimulus. Then, participants conducted an incidental memory test including the target stimuli presented in the cueing task and novel stimuli. Results revealed that valid gaze cues significantly enhanced memory performance compared to arrow cues, while gaze cues and arrow cues had similar effects on attention orienting. This effect was consistent across age groups, suggesting that gaze cueing facilitates memory regardless of developmental stage. The findings support the socio-communicative aspect of gaze cues, which may influence cognitive facilitation in joint attentional situations in childhood. Joint attentional situations may be rewarding, influencing the motivation for implicit cognitive processing of objects that are the focus of attention. This study contributes to our understanding of spontaneous social cognition in children and underscores the importance of gaze cues in facilitating memory and learning in social contexts.

The inter-association between face processing, intelligence, and autistic-like nonverbal communication

The degree to which face processing abilities inter-relate, and associate with general intelligence, remains a contentious issue. Furthermore, poorer face processing abilities may be a result of reduced social interest associated with higher levels of trait-autism, consistent with the social motivation theory of autism. However, the association between multiple dimensions of face processing (i.e., a general face factor) and trait-autism, specifically autistic-like nonverbal communication, has not been estimated. Consequently, we administered four face processing ability tests (assessing face detection, the perception and memory of face identity, and expression recognition), four cognitive ability tests, and the Autism Quotient to a sample of 253 general community adults. Based on latent variable modelling, we identified a general face processing ability factor (f), and it was positively associated with general intelligence (g; λ = .48). We conclude that face processing abilities may be a candidate ability within the Cattell-Horn-Carroll model of intelligence. Moreover, face memory was positively associated with g (β = .31). We discuss the possibility of developmental prosopagnosia, i.e., deficits in face memory, being diagnosed as a learning disability. Furthermore, autistic-like nonverbal communication was a significant, negative predictor (β = -.45) of f, and g was neither a mediator nor suppressor of the effect. Finally, the unique effect between autistic-like nonverbal communication difficulties and face processing abilities, independently of intelligence, was considered in line with the social motivation theory of autism.

The role of the dopamine system in autism spectrum disorder revealed using machine learning: an ABIDE database-based study

This study explores the diagnostic value of dopamine system imaging characteristics in children with autism spectrum disorder. Functional magnetic resonance data from 551 children in the Autism Brain Imaging Data Exchange database were analyzed, focusing on six dopamine-related brain regions as regions of interest. Functional connectivity between these ROIs and across the whole brain was assessed. Machine learning techniques then evaluated the ability of the dopamine system's imaging features to predict autism spectrum disorder. Functional connectivity was significantly higher in autism spectrum disorder children between the ventral tegmental area and substantia nigra, prefrontal cortex, nucleus accumbens, and between the substantia nigra and hypothalamus compared to typically developing children. Additionally, clustering methods identified two autism spectrum disorder subtypes, achieving over 0.8 accuracy. Subtype 1 showed higher stereotyped behavior scores than subtype 2 in both genders, with subtype-specific functional connectivity differences between male and female autism spectrum disorder groups. These findings suggest that abnormal functional connectivity in the dopamine system serves as a diagnostic biomarker for autism spectrum disorder and can support clinical decision-making and personalized treatment optimization.

I tweet, therefore I am: a systematic review on social media use and disorders of the social brain

With rapid technological advances, social media has become an everyday form of human social interactions. For the first time in evolutionary history, people can now interact in virtual spaces where temporal, spatial, and embodied cues are decoupled from one another. What implications do these recent changes have for socio-cognitive phenotypes and mental disorders? We have conducted a systematic review on the relationships between social media use and mental disorders involving the social brain. The main findings indicate evidence of increased social media usage in individuals with psychotic spectrum phenotypes and especially among individuals with disorders characterized by alterations in the basic self, most notably narcissism, body dysmorphism, and eating disorders. These findings can be understood in the context of a new conceptual model, referred to here as 'Delusion Amplification by Social Media', whereby this suite of disorders and symptoms centrally involves forms of mentalistic delusions, linked with altered perception and perpetuation of distorted manifestations of the self, that are enabled and exacerbated by social media. In particular, an underdeveloped and incoherent sense of self, in conjunction with 'real life' social isolation that inhibits identify formation and facilitates virtual social interactions, may lead to use of social media to generate and maintain a more or less delusional sense of self identity. The delusions involved may be mental (as in narcissism and erotomania), or somatic (as in body dysmorphic disorder and eating disorders, encompassing either the entire body or specific body parts). In each case, the virtual nature of social media facilitates the delusionality because the self is defined and bolstered in this highly mentalistic environment, where real-life exposure of the delusion can be largely avoided. Current evidence also suggests that increased social media usage, via its disembodied and isolative nature, may be associated with psychotic spectrum phenotypes, especially delusionality, by the decoupling of inter and intra-corporeal cues integral to shared reality testing, leading to the blurring of self-other boundaries.

Disentangling the perceptual underpinnings of autism: Evidence from a face aftereffects experiment

Existing literature has documented diminished norm-based adaptation (aftereffects) across several perceptual domains in autism. However, the exact underlying mechanisms, such as sensory dominance possibly caused by imprecise priors and/or increased sensory precision, remain elusive. The "Bayesian brain" framework offers refined methods to investigate these mechanisms. This study utilized both model-free (frequentist statistics) and model-based (hierarchical Drift Diffusion Modeling) analytical approaches to compare gender face aftereffects in male adolescents with autism (n = 29) to neurotypical controls (n = 39) using a behavioral choice experiment. Contrary to our initial hypotheses, our analyses did not find support for imprecise priors or increased sensory precision within the autistic group. Instead, we observed generally decreased drift rates towards male but not female stimuli in the autistic group. Thus, our findings suggest a lack of own-gender bias in face processing among the autistic participants. These findings align with more recent behavioral and neurophysiological research observing intact priors in individuals with autism, suggesting that other mechanisms may better explain the perceptual challenges in autism. Our study contributes to the ongoing discourse on perceptual processing in autism, emphasizing the necessity for more nuanced analytical approaches in order to unravel the complexity of this condition.

Unraveling neural adaptation to vocal and non-vocal sounds in autism

OBJECTIVE

Autism is linked to a strong need for sameness and difficulties in social communication, associated with atypical brain responses to voices and changes. This study aimed to characterize neural adaptation in autistic adults using a Roving paradigm and assess how vocal vs. non-vocal, as well as neutral vs. emotional sounds, influence this adaptation.

METHODS

Neural adaptation was measured in 20 autistic and 20 non-autistic adults using a Roving paradigm, where sounds were repeated 4, 8, or 14 times. Neural responses and Repetition Positivity (RP) amplitudes were analyzed as indices of adaptation.

RESULTS

RP amplitudes showed no significant differences between groups for vocal or non-vocal sounds, but adaptation dynamics varied. Non-autistic adults adapted more quickly to non-vocal (5-8 repetitions) compared to vocal sounds (12-14 repetitions). In contrast, autistic adults adapt faster to vocal than to non-vocal sounds. Moreover emotional prosodic content influenced RP amplitude in autistic adults only, suggesting heightened sensitivity to emotional cues in social contexts.

CONCLUSIONS

The study highlights how atypical neural adaptation in autism how emotional content impacts social communication deficits. These insights enhance understanding of autism-related adaptation challenges.

Predictive Processing Among Individuals with Autism Spectrum Disorder During Online Language Comprehension: A Preliminary Systematic Review

The present study aims to fill the research gap by evaluating published empirical studies and answering the specific research question: Can individuals with autism spectrum disorder (ASD) predict upcoming linguistic information during real-time language comprehension? Following the PRISMA framework, an initial search via PubMed, Web of Science, SCOPUS, and Google Scholar yielded a total of 697 records. After screening the abstract and full text, 10 studies, covering 350 children and adolescents with ASD ranging from 2 to 15 years old, were included for analysis. We found that individuals with ASD may predict the upcoming linguistic information by using verb semantics but not pragmatic prosody during language comprehension. Nonetheless, 9 out of 10 studies used short spoken sentences as stimuli, which may not encompass the complexity of language comprehension. Moreover, eye-tracking in the lab setting was the primary data collection technique, which may further limit the generalizability of the research findings. Using a narrative approach to synthesize and evaluate the research findings, we found that individuals with ASD may have the ability to predict the upcoming linguistic information. However, this field of research still calls for more studies that will expand the scope of research topics, utilize more complex linguistic stimuli, and employ more diverse data collection techniques.

A multimodal neural signature of face processing in autism within the fusiform gyrus

Atypical face processing is commonly reported in autism. Its neural correlates have been explored extensively across single neuroimaging modalities within key regions of the face processing network, such as the fusiform gyrus (FFG). Nonetheless, it is poorly understood how variation in brain anatomy and function jointly impacts face processing and social functioning. Here we leveraged a large multimodal sample to study the cross-modal signature of face processing within the FFG across four imaging modalities (structural magnetic resonance imaging (MRI), resting-state functional magnetic resonance imaging, task-functional magnetic resonance imaging and electroencephalography) in 204 autistic and nonautistic individuals aged 7-30 years (case-control design). We combined two methodological innovations-normative modeling and linked independent component analysis-to integrate individual-level deviations across modalities and assessed how multimodal components differentiated groups and informed social functioning in autism. Groups differed significantly in a multimodal component driven by bilateral resting-state functional MRI, bilateral structure, right task-functional MRI and left electroencephalography loadings in face-selective and retinotopic FFG. Multimodal components outperformed unimodal ones in differentiating groups. In autistic individuals, multimodal components were associated with cognitive and clinical features linked to social, but not nonsocial, functioning. These findings underscore the importance of elucidating multimodal neural associations of social functioning in autism, offering potential for the identification of mechanistic and prognostic biomarkers.

Spatiotemporal Eye Movement Dynamics Reveal Altered Face Prioritization in Early Visual Processing Among Autistic Children

BACKGROUND

Reduced social attention-looking at faces-is one of the most common manifestations of social difficulty in autism that is central to social development. Although reduced social attention is well characterized in autism, qualitative differences in how social attention unfolds across time remains unknown.

METHODS

We used a computational modeling (i.e., hidden Markov modeling) approach to assess and compare the spatiotemporal dynamics of social attention in a large, well-characterized sample of children with autism (n = 280) and neurotypical children (n = 119) (ages 6-11) who completed 3 social eye-tracking assays at 3 longitudinal time points (baseline, 6 weeks, 24 weeks).

RESULTS

Our analysis supported the existence of 2 common eye movement patterns that emerged across 3 eye-tracking assays. A focused pattern was characterized by small face regions of interest, which had high a probability of capturing fixations early in visual processing. In contrast, an exploratory pattern was characterized by larger face regions of interest, with a lower initial probability of fixation and more nonsocial regions of interest. In the context of social perception, children with autism showed significantly more exploratory eye movement patterns than neurotypical children across all social perception assays and all 3 longitudinal time points. Eye movement patterns were associated with clinical features of autism, including adaptive function, face recognition, and autism symptom severity.

CONCLUSIONS

Decreased likelihood of precisely looking at faces early in social visual processing may be an important feature of autism that is associated with autism-related symptomology and may reflect less visual sensitivity to face information.