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Kisker J, Johnsdorf M, Sagehorn M, Schöne B, Gruber T. Induced oscillatory brain responses under virtual reality conditions in the context of repetition priming. Exp Brain Res 2024; 242:525-541. [PMID: 38200371 PMCID: PMC10894769 DOI: 10.1007/s00221-023-06766-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2023] [Accepted: 12/12/2023] [Indexed: 01/12/2024]
Abstract
In the human electroencephalogram (EEG), induced oscillatory responses in various frequency bands are regarded as valuable indices to examine the neural mechanisms underlying human memory. While the advent of virtual reality (VR) drives the investigation of mnemonic processing under more lifelike settings, the joint application of VR and EEG methods is still in its infancy (e.g., due to technical limitations impeding the signal acquisition). The objective of the present EEG study was twofold. First, we examined whether the investigation of induced oscillations under VR conditions yields equivalent results compared to standard paradigms. Second, we aimed at obtaining further insights into basic memory-related brain mechanisms in VR. To these ends, we relied on a standard implicit memory design, namely repetition priming, for which the to-be-expected effects are well-documented for conventional studies. Congruently, we replicated a suppression of the evoked potential after stimulus onset. Regarding the induced responses, we observed a modulation of induced alphaband in response to a repeated stimulus. Importantly, our results revealed a repetition-related suppression of the high-frequency induced gammaband response (>30 Hz), indicating the sharpening of a cortical object representation fostering behavioral priming effects. Noteworthy, the analysis of the induced gammaband responses required a number of measures to minimize the influence of external and internal sources of artefacts (i.e., the electrical shielding of the technical equipment and the control for miniature eye movements). In conclusion, joint VR-EEG studies with a particular focus on induced oscillatory responses offer a promising advanced understanding of mnemonic processing under lifelike conditions.
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Affiliation(s)
- Joanna Kisker
- Institute of Psychology, Osnabrück University, Osnabrück, Germany.
| | - Marike Johnsdorf
- Institute of Psychology, Osnabrück University, Osnabrück, Germany
| | - Merle Sagehorn
- Institute of Psychology, Osnabrück University, Osnabrück, Germany
| | - Benjamin Schöne
- Institute of Psychology, Osnabrück University, Osnabrück, Germany
- Department of Psychology, Norwegian University of Science and Technology, Trondheim, Norway
| | - Thomas Gruber
- Institute of Psychology, Osnabrück University, Osnabrück, Germany
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2
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Thornberry C, Caffrey M, Commins S. Theta oscillatory power decreases in humans are associated with spatial learning in a virtual water maze task. Eur J Neurosci 2023; 58:4341-4356. [PMID: 37957526 DOI: 10.1111/ejn.16185] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2023] [Accepted: 10/20/2023] [Indexed: 11/15/2023]
Abstract
Theta oscillations (4-8 Hz) in humans play a role in navigation processes, including spatial encoding, retrieval and sensorimotor integration. Increased theta power at frontal and parietal midline regions is known to contribute to successful navigation. However, the dynamics of cortical theta and its role in spatial learning are not fully understood. This study aimed to investigate theta oscillations via electroencephalogram (EEG) during spatial learning in a virtual water maze. Participants were separated into a learning group (n = 25) who learned the location of a hidden goal across 12 trials, or a time-matched non-learning group (n = 25) who were required to simply navigate the same arena, but without a goal. We compared all trials, at two phases of learning, the trial start and the goal approach. We also compared the first six trials with the last six trials within-groups. The learning group showed reduced low-frequency theta power at the frontal and parietal midline during the start phase and largely reduced theta combined with a short increase at both midlines during the goal-approach phase. These patterns were not found in the non-learning group, who instead displayed extensive increases in low-frequency oscillations at both regions during the trial start and at the parietal midline during goal approach. Our results support the theory that theta plays a crucial role in spatial encoding during exploration, as opposed to sensorimotor integration. We suggest our findings provide evidence for a link between learning and a reduction of theta oscillations in humans.
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Affiliation(s)
- Conor Thornberry
- Department of Psychology, Maynooth University, Maynooth, Ireland
| | - Michelle Caffrey
- Department of Psychology, Maynooth University, Maynooth, Ireland
| | - Sean Commins
- Department of Psychology, Maynooth University, Maynooth, Ireland
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3
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Reggente N. VR for Cognition and Memory. Curr Top Behav Neurosci 2023; 65:189-232. [PMID: 37440126 DOI: 10.1007/7854_2023_425] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/14/2023]
Abstract
This chapter will provide a review of research into human cognition through the lens of VR-based paradigms for studying memory. Emphasis is placed on why VR increases the ecological validity of memory research and the implications of such enhancements.
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Affiliation(s)
- Nicco Reggente
- Institute for Advanced Consciousness Studies, Santa Monica, CA, USA.
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4
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Truong NCD, Wang X, Wanniarachchi H, Lang Y, Nerur S, Chen KY, Liu H. Mapping and understanding of correlated electroencephalogram (EEG) responses to the newsvendor problem. Sci Rep 2022; 12:13800. [PMID: 35963934 PMCID: PMC9376113 DOI: 10.1038/s41598-022-17970-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2022] [Accepted: 08/03/2022] [Indexed: 12/03/2022] Open
Abstract
Decision-making is one of the most critical activities of human beings. To better understand the underlying neurocognitive mechanism while making decisions under an economic context, we designed a decision-making paradigm based on the newsvendor problem (NP) with two scenarios: low-profit margins as the more challenging scenario and high-profit margins as the less difficult one. The EEG signals were acquired from healthy humans while subjects were performing the task. We adopted the Correlated Component Analysis (CorrCA) method to identify linear combinations of EEG channels that maximize the correlation across subjects ([Formula: see text]) or trials ([Formula: see text]). The inter-subject or inter-trial correlation values (ISC or ITC) of the first three components were estimated to investigate the modulation of the task difficulty on subjects' EEG signals and respective correlations. We also calculated the alpha- and beta-band power of the projection components obtained by the CorrCA to assess the brain responses across multiple task periods. Finally, the CorrCA forward models, which represent the scalp projections of the brain activities by the maximally correlated components, were further translated into source distributions of underlying cortical activity using the exact Low Resolution Electromagnetic Tomography Algorithm (eLORETA). Our results revealed strong and significant correlations in EEG signals among multiple subjects and trials during the more difficult decision-making task than the easier one. We also observed that the NP decision-making and feedback tasks desynchronized the normalized alpha and beta powers of the CorrCA components, reflecting the engagement state of subjects. Source localization results furthermore suggested several sources of neural activities during the NP decision-making process, including the dorsolateral prefrontal cortex, anterior PFC, orbitofrontal cortex, posterior cingulate cortex, and somatosensory association cortex.
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Affiliation(s)
- Nghi Cong Dung Truong
- Department of Bioengineering, University of Texas at Arlington, 500 UTA Blvd, Arlington, TX, 76019, USA
| | - Xinlong Wang
- Department of Bioengineering, University of Texas at Arlington, 500 UTA Blvd, Arlington, TX, 76019, USA
| | - Hashini Wanniarachchi
- Department of Bioengineering, University of Texas at Arlington, 500 UTA Blvd, Arlington, TX, 76019, USA
| | - Yan Lang
- Information Systems and Operations Management, University of Texas at Arlington, 701 S. Nedderman Drive, Arlington, TX, 76019, USA
- Department of Business, State University of New York at Oneonta, 108 Ravine Parkway Oneonta, New York, NY, 13820, USA
| | - Sridhar Nerur
- Information Systems and Operations Management, University of Texas at Arlington, 701 S. Nedderman Drive, Arlington, TX, 76019, USA
| | - Kay-Yut Chen
- Information Systems and Operations Management, University of Texas at Arlington, 701 S. Nedderman Drive, Arlington, TX, 76019, USA
| | - Hanli Liu
- Department of Bioengineering, University of Texas at Arlington, 500 UTA Blvd, Arlington, TX, 76019, USA.
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5
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Law LLF, Mok VCT, Yau MKS, Fong KNK. Effects of functional task exercise on everyday problem-solving ability and functional status in older adults with mild cognitive impairment-a randomised controlled trial. Age Ageing 2022; 51:6399890. [PMID: 34673918 DOI: 10.1093/ageing/afab210] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2021] [Indexed: 11/14/2022] Open
Abstract
OBJECTIVE To investigate the effect of functional task exercise on everyday problem-solving ability and functional status in older adults with mild cognitive impairment compared to single exercise or cognitive training and no treatment control. DESIGN A single-blind, four-arm randomised controlled trial. SETTING Out-patient clinic and community centre. PARTICIPANTS Older adults with mild cognitive impairment aged ≥60 living in community. METHODS Participants (N = 145) were randomised to 8-week functional task exercise (N = 34), cognitive training (N = 38), exercise training (N = 37), or wait-list control (N = 36) group. Outcomes measures: Neurobehavioral Cognitive Status Examination, Category Verbal Fluency Test, Trail Making Test, Problems in Everyday Living Test, Activities of Daily Living Questionnaire, Instrumental Activities of Daily Living Scale; Chair stand test, Berg Balance Scale, and Short Form-12 Health Survey were conducted at baseline, post-intervention and 5-months follow-up. RESULTS Post-intervention results of ANCOVA revealed cognitive training improved everyday problem-solving (P = 0.012) and exercise training improved functional status (P = 0.003) compared to wait-list control. Functional task exercise group demonstrated highest improvement compared to cognitive training, exercise training and wait-list control groups in executive function (P range = 0.003-0.018); everyday problem-solving (P < 0.001); functional status (P range = <.001-0.002); and physical performance (P = 0.008) at post-intervention, with all remained significant at 5-month follow-up, and further significant improvement in mental well-being (P = 0.043). CONCLUSIONS Functional task exercise could be an effective intervention to improve everyday problem-solving ability and functional status in older adults with mild cognitive impairment. The findings support combining cognitive and exercise intervention may give additive and even synergistic effects.
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Affiliation(s)
- Lawla L F Law
- School of Medical and Health Sciences, Tung Wah College, Hong Kong SAR
| | - Vincent C T Mok
- Therese Pei Fong Chow Research Centre for Prevention of Dementia, Gerald Choa Neuroscience Centre, Lui Che Woo Institute of Innovative Medicine, Division of Neurology, Department of Medicine and Therapeutics, Faculty of Medicine, The Chinese University of Hong Kong, Hong Kong SAR
| | - Matthew K S Yau
- School of Medical and Health Sciences, Tung Wah College, Hong Kong SAR
| | - Kenneth N K Fong
- Department of Rehabilitation Sciences, The Hong Kong Polytechnic University, Hong Kong SAR
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Wen D, Li R, Jiang M, Li J, Liu Y, Dong X, Saripan MI, Song H, Han W, Zhou Y. Multi-dimensional conditional mutual information with application on the EEG signal analysis for spatial cognitive ability evaluation. Neural Netw 2021; 148:23-36. [PMID: 35051867 DOI: 10.1016/j.neunet.2021.12.010] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2020] [Revised: 12/16/2021] [Accepted: 12/17/2021] [Indexed: 10/19/2022]
Abstract
This study aims to explore an effective method to evaluate spatial cognitive ability, which can effectively extract and classify the feature of EEG signals collected from subjects participating in the virtual reality (VR) environment; and evaluate the training effect objectively and quantitatively to ensure the objectivity and accuracy of spatial cognition evaluation, according to the classification results. Therefore, a multi-dimensional conditional mutual information (MCMI) method is proposed, which could calculate the coupling strength of two channels considering the influence of other channels. The coupled characteristics of the multi-frequency combination were transformed into multi-spectral images, and the image data were classified employing the convolutional neural networks (CNN) model. The experimental results showed that the multi-spectral image transform features based on MCMI are better in classification than other methods, and among the classification results of six band combinations, the best classification accuracy of Beta1-Beta2-Gamma combination is 98.3%. The MCMI characteristics on the Beta1-Beta2-Gamma band combination can be a biological marker for the evaluation of spatial cognition. The proposed feature extraction method based on MCMI provides a new perspective for spatial cognitive ability assessment and analysis.
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Affiliation(s)
- Dong Wen
- Institute of Artificial Intelligence, University of Science and Technology Beijing, Beijing, China
| | - Rou Li
- School of Information Science and Engineering, Yanshan University, Qinhuangdao, China
| | - Mengmeng Jiang
- School of Information Science and Engineering, Yanshan University, Qinhuangdao, China
| | - Jingjing Li
- School of Information Science and Engineering, Yanshan University, Qinhuangdao, China
| | - Yijun Liu
- School of Science, Yanshan University, Qinhuangdao, China
| | - Xianling Dong
- Department of Biomedical Engineering, Chengde Medical University, Chengde, China
| | - M Iqbal Saripan
- Faculty of Engineering, Universiti Putra Malaysia, Serdang, Malaysia
| | - Haiqing Song
- Department of Neurology, Xuanwu Hospital of Capital Medical University, Beijing, China
| | - Wei Han
- School of Information Science and Engineering, Yanshan University, Qinhuangdao, China
| | - Yanhong Zhou
- School of Mathematics and Information Science and Technology, Hebei Normal University of Science and Technology, Qinhuangdao, China.
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7
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Gallardo-Moreno GB, Alvarado-Rodríguez FJ, Romo-Vázquez R, Vélez-Pérez H, González-Garrido AA. Type 1 diabetes affects the brain functional connectivity underlying working memory processing. Psychophysiology 2021; 59:e13969. [PMID: 34762737 DOI: 10.1111/psyp.13969] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2021] [Revised: 10/22/2021] [Accepted: 10/26/2021] [Indexed: 11/29/2022]
Abstract
Visuospatial working memory (VSWM) deficits have been demonstrated to occur during the development of type-1-diabetes (T1D). Despite confirming the early appearance of distinct task-related brain activation patterns in T1D patients compared to healthy controls, the effect of VSWM load on functional brain connectivity during task performance is still unknown. Using electroencephalographic methods, the present study evaluated this topic in clinically well-controlled T1D young patients and healthy individuals, while they performed a VSWM task with different memory load levels during two main VSWM processing phases: encoding and maintenance. The results showed a significantly lower number of correct responses and longer reaction times in T1D while performing the task. Besides, higher and progressively increasing functional connectivity indices were found for T1D patients in response to cumulative degrees of VSWM load, from the beginning of the VSWM encoding phase, without notably affecting the VSWM maintenance phase. In contrast, healthy controls managed to solve the task, showing lower functional brain connectivity during the initial VSWM processing steps with more gradual task-related adjustments. Present results suggest that T1D patients anticipate high VSWM load demands by early recruiting supplementary processing resources as the probable expression of a more inefficient, though paradoxically better adjusted to task demands cognitive strategy.
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Affiliation(s)
| | - Francisco J Alvarado-Rodríguez
- División de Electrónica y Computación, CUCEI, Universidad de Guadalajara, Guadalajara, Mexico.,Dpto. de Electromecánica, Universidad Autónoma de Guadalajara, Guadalajara, Mexico
| | - Rebeca Romo-Vázquez
- División de Electrónica y Computación, CUCEI, Universidad de Guadalajara, Guadalajara, Mexico
| | - Hugo Vélez-Pérez
- División de Electrónica y Computación, CUCEI, Universidad de Guadalajara, Guadalajara, Mexico
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8
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Xie Y, Li Y, Duan H, Xu X, Zhang W, Fang P. Theta Oscillations and Source Connectivity During Complex Audiovisual Object Encoding in Working Memory. Front Hum Neurosci 2021; 15:614950. [PMID: 33762914 PMCID: PMC7982740 DOI: 10.3389/fnhum.2021.614950] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2020] [Accepted: 01/28/2021] [Indexed: 12/02/2022] Open
Abstract
Working memory is a limited capacity memory system that involves the short-term storage and processing of information. Neuroscientific studies of working memory have mostly focused on the essential roles of neural oscillations during item encoding from single sensory modalities (e.g., visual and auditory). However, the characteristics of neural oscillations during multisensory encoding in working memory are rarely studied. Our study investigated the oscillation characteristics of neural signals in scalp electrodes and mapped functional brain connectivity while participants encoded complex audiovisual objects in a working memory task. Experimental results showed that theta oscillations (4–8 Hz) were prominent and topographically distributed across multiple cortical regions, including prefrontal (e.g., superior frontal gyrus), parietal (e.g., precuneus), temporal (e.g., inferior temporal gyrus), and occipital (e.g., cuneus) cortices. Furthermore, neural connectivity at the theta oscillation frequency was significant in these cortical regions during audiovisual object encoding compared with single modality object encoding. These results suggest that local oscillations and interregional connectivity via theta activity play an important role during audiovisual object encoding and may contribute to the formation of working memory traces from multisensory items.
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Affiliation(s)
- Yuanjun Xie
- School of Education, Xin Yang College, Xinyang, China.,Department of Radiology, Xijing Hospital, Fourth Military Medical University, Xi'an, China
| | - Yanyan Li
- School of Education, Xin Yang College, Xinyang, China
| | - Haidan Duan
- School of Education, Xin Yang College, Xinyang, China
| | - Xiliang Xu
- School of Education, Xin Yang College, Xinyang, China
| | - Wenmo Zhang
- Department of Fundamental, Army Logistical University, Chongqing, China.,Department of Social Medicine and Health and Management, College of Military Preventive Medicine, Army Medical University, Chongqing, China
| | - Peng Fang
- Department of Military Medical Psychology, Fourth Military Medical University, Xi'an, China
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9
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Mishra S, Kumar A, Padmanabhan P, Gulyás B. Neurophysiological Correlates of Cognition as Revealed by Virtual Reality: Delving the Brain with a Synergistic Approach. Brain Sci 2021; 11:brainsci11010051. [PMID: 33466371 PMCID: PMC7824819 DOI: 10.3390/brainsci11010051] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2020] [Revised: 12/16/2020] [Accepted: 12/25/2020] [Indexed: 12/11/2022] Open
Abstract
The synergy of perceptual psychology, technology, and neuroscience can be used to comprehend how virtual reality affects cognition of human brain. Numerous studies have used neuroimaging modalities to assess the cognitive state and response of the brain with various external stimulations. The virtual reality-based devices are well known to incur visual, auditory, and haptic induced perceptions. Neurophysiological recordings together with virtual stimulations can assist in correlating humans’ physiological perception with response in the environment designed virtually. The effective combination of these two has been utilized to study human behavior, spatial navigation performance, and spatial presence, to name a few. Moreover, virtual reality-based devices can be evaluated for the neurophysiological correlates of cognition through neurophysiological recordings. Challenges exist in the integration of real-time neuronal signals with virtual reality-based devices, and enhancing the experience together with real-time feedback and control through neuronal signals. This article provides an overview of neurophysiological correlates of cognition as revealed by virtual reality experience, together with a description of perception and virtual reality-based neuromodulation, various applications, and existing challenges in this field of research.
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Affiliation(s)
- Sachin Mishra
- Cognitive Neuroimaging Centre, 59 Nanyang Drive, Nanyang Technological University, Singapore 636921, Singapore; (S.M.); (A.K.)
| | - Ajay Kumar
- Cognitive Neuroimaging Centre, 59 Nanyang Drive, Nanyang Technological University, Singapore 636921, Singapore; (S.M.); (A.K.)
- Institute of Biomedical Sciences, National Sun Yat-sen University, Gushan District, Kaohsiung 804, Taiwan
- Department of Mechanical and Electro-Mechanical Engineering, National Sun Yat-sen University, Gushan District, Kaohsiung 804, Taiwan
| | - Parasuraman Padmanabhan
- Cognitive Neuroimaging Centre, 59 Nanyang Drive, Nanyang Technological University, Singapore 636921, Singapore; (S.M.); (A.K.)
- Correspondence: (P.P.); (B.G.)
| | - Balázs Gulyás
- Cognitive Neuroimaging Centre, 59 Nanyang Drive, Nanyang Technological University, Singapore 636921, Singapore; (S.M.); (A.K.)
- Department of Clinical Neuroscience, Karolinska Institute, 17176 Stockholm, Sweden
- Lee Kong Chian School of Medicine, Nanyang Technological University, Singapore 608232, Singapore
- Correspondence: (P.P.); (B.G.)
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10
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Charalambous E, Hanna S, Penn A. Aha! I know where I am: the contribution of visuospatial cues to reorientation in urban environments. SPATIAL COGNITION AND COMPUTATION 2021. [DOI: 10.1080/13875868.2020.1865359] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Efrosini Charalambous
- Bartlett School of Architecture, University College London Bartlett Faculty of the Built Environment, London, United Kingdom of Great Britain and Northern Ireland
| | - Sean Hanna
- Bartlett School of Architecture, University College London Bartlett Faculty of the Built Environment, London, United Kingdom of Great Britain and Northern Ireland
| | - Alan Penn
- Bartlett School of Architecture, University College London Bartlett Faculty of the Built Environment, London, United Kingdom of Great Britain and Northern Ireland
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11
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Rounds JD, Cruz-Garza JG, Kalantari S. Using Posterior EEG Theta Band to Assess the Effects of Architectural Designs on Landmark Recognition in an Urban Setting. Front Hum Neurosci 2020; 14:584385. [PMID: 33362491 PMCID: PMC7759667 DOI: 10.3389/fnhum.2020.584385] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2020] [Accepted: 11/13/2020] [Indexed: 11/27/2022] Open
Abstract
The process of urban landmark-based navigation has proven to be difficult to study in a rigorous fashion, primarily due to confounding variables and the problem of obtaining reliable data in real-world contexts. The development of high-resolution, immersive virtual reality technologies has opened exciting new possibilities for gathering data on human wayfinding that could not otherwise be readily obtained. We developed a research platform using a virtual environment and electroencephalography (EEG) to better understand the neural processes associated with landmark usage and recognition during urban navigation tasks. By adjusting the architectural parameters of different buildings in this virtual environment, we isolated and tested specific design features to determine whether or not they served as a target for landmarking. EEG theta band (4–7 Hz) event-related synchronization/desynchronization over posterior scalp areas was evaluated at the time when participants observed each target building along a predetermined self-paced route. A multi-level linear model was used to investigate the effects of salient architectural features on posterior scalp areas. Our results support the conclusion that highly salient architectural features—those that contrast sharply with the surrounding environment—are more likely to attract visual attention, remain in short-term memory, and activate brain regions associated with wayfinding compared with non-salient buildings. After establishing this main aggregate effect, we evaluated specific salient architectural features and neural correlates of navigation processing. The buildings that most strongly associated extended gaze time, location recall accuracy, and changes in theta-band neural patterns with landmarking in our study were those that incorporated rotational twist designs and natural elements such as trees and gardens. Other building features, such as unusual façade patterns or building heights, were to a lesser extent also associated with landmarking.
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Affiliation(s)
- James D Rounds
- Human Development, Cornell University, Ithaca, NY, United States
| | | | - Saleh Kalantari
- Department of Design and Environmental Analysis, Cornell University, Ithaca, NY, United States
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12
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Kronovsek T, Hermand E, Berthoz A, Castilla A, Gallou-Guyot M, Daviet JC, Perrochon A. Age-related decline in visuo-spatial working memory is reflected by dorsolateral prefrontal activation and cognitive capabilities. Behav Brain Res 2020; 398:112981. [PMID: 33144176 DOI: 10.1016/j.bbr.2020.112981] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2020] [Revised: 10/21/2020] [Accepted: 10/22/2020] [Indexed: 12/14/2022]
Abstract
INTRODUCTION Visuo-spatial working memory (VSWM) performances undergo a decline throughout aging and are affected by the space in which the task is performed (reaching or navigational). Cerebral oxygenation and cognitive capabilities could explain this decline. We assessed the effects of age on cerebral oxygenation of the dorsolateral prefrontal cortex (dlPFC) in VSWM tasks in reaching and navigational space. We also assessed cognitive correlates of VSWM performance in each space. METHOD Thirty-one (31) young adults (YA) and 24 healthy older adults (OA) performed a battery of neuropsychological tests and the electronic Corsi Block-tapping Test in reaching space (e-CBT) and in navigational space on the "Virtual Carpet" (VWCT). Participants were asked to memorize and recall a sequential pathway, progressively increasing from 2 to 9 blocks. Their span score reflected VSWM performance. The dlPFC oxygenation (oxyhaemoglobin: ΔO2Hb and deoxyhaemoglobin: ΔHHb) was measured by using functional Near-Infrared Spectroscopy (fNIRS) during the encoding of the sequential pathway in both tasks. RESULTS YA had higher span scores than OA in both spaces. We identified a significantly stronger decrease of ΔHHb in YA compared to OA during encoding in VWCT. OA also exhibited significantly lower cerebral oxygenation in VWCT compared to e-CBT. A decrease of ΔHHb was also associated with a better performance in VWCT. Finally, we identified the association of mental rotation and executive functions with VSWM performance in both tasks. CONCLUSION VSWM performance and cerebral oxygenation during encoding are impacted by aging. Space in which the task was performed was found to be associated with different cognitive functions and revealed differences in cerebral oxygenation.
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Affiliation(s)
- Téo Kronovsek
- Université De Limoges, HAVAE, EA 6310, F-87000 Limoges, France
| | - Eric Hermand
- Université De Limoges, HAVAE, EA 6310, F-87000 Limoges, France; EA 7369 URePSSS (Unité de Recherche Pluridisciplinaire Sport, Santé, Société), Université du Littoral Côte d'Opale, Dunkerque, France
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13
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Yokosawa K, Kimura K, Takase R, Murakami Y, Boasen J. Functional decline of the precuneus associated with mild cognitive impairment: Magnetoencephalographic observations. PLoS One 2020; 15:e0239577. [PMID: 32986743 PMCID: PMC7521706 DOI: 10.1371/journal.pone.0239577] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2020] [Accepted: 09/10/2020] [Indexed: 12/13/2022] Open
Abstract
Mild Cognitive Impairment (MCI) is a border or precursor state of dementia. To optimize implemented interventions for MCI, it is essential to clarify the underlying neural mechanisms. However, knowledge regarding the brain regions responsible for MCI is still limited. Here, we implemented the Montreal Cognitive Assessment (MoCA) test, a screening tool for MCI, in 20 healthy elderly participants (mean age, 67.5 years), and then recorded magnetoencephalograms (MEG) while they performed a visual sequential memory task. In the task, each participant memorized the four possible directions of seven sequentially presented arrow images. Recall accuracy for beginning items of the memory sequence was significantly positively related with MoCA score. Meanwhile, MEG revealed stronger alpha-band (8-13 Hz) rhythm desynchronization bilaterally in the precuneus (PCu) for higher MoCA (normal) participants. Most importantly, this PCu desynchronization response weakened in correspondence with lower MoCA score during the beginning of sequential memory encoding, a time period that should rely on working memory and be affected by declined cognitive function. Our results suggest that deactivation of the PCu is associated with early MCI, and corroborate pathophysiological findings based on post-mortem tissue which have implicated hypoperfusion of the PCu in early stages of Alzheimer disease. Our results indicate the possibility that cognitive decline can be detected early and non-invasively by monitoring PCu activity with electrophysiological methods.
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Affiliation(s)
- Koichi Yokosawa
- Faculty of Health Sciences, Hokkaido University, Sapporo, Hokkaido, Japan
- * E-mail:
| | - Keisuke Kimura
- Graduate School of Health Sciences, Hokkaido University, Sapporo, Hokkaido, Japan
| | - Ryoken Takase
- Graduate School of Health Sciences, Hokkaido University, Sapporo, Hokkaido, Japan
| | - Yui Murakami
- Faculty of Health Sciences, Hokkaido University, Sapporo, Hokkaido, Japan
- Department of Occupational Therapy, Faculty of Human Science, Hokkaido Bunkyo University, Eniwa, Hokkaido, Japan
| | - Jared Boasen
- Faculty of Health Sciences, Hokkaido University, Sapporo, Hokkaido, Japan
- Tech3Lab, HEC Montréal, Montréal, Quebec, Canada
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14
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Jang KM, Kim MS, Kim DW. The Dynamic Properties of a Brain Network During Spatial Working Memory Tasks in College Students With ADHD Traits. Front Hum Neurosci 2020; 14:580813. [PMID: 33132887 PMCID: PMC7505193 DOI: 10.3389/fnhum.2020.580813] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2020] [Accepted: 08/14/2020] [Indexed: 11/13/2022] Open
Abstract
This study investigated deficits of spatial working memory in college students with attention-deficit/hyperactivity disorder (ADHD) traits using event-related potentials (ERPs) and the spatial 2-back task. We also computed sensory-level activity using EEG data and investigated theta and alpha neural oscillations, phase-locking values (PLV), and brain networks. Based on the scores from the Adult ADHD Self-Report Scale (ASRS) and Conners' Adult ADHD Rating Scales (CAARS), an ADHD-trait group (n = 40) and a normal control group (n = 41) were selected. Participants were required to respond to whether the presented stimulus was at the same location as that presented two trials earlier. The ADHD-trait group showed significantly slower response times than the control group in the spatial 2-back task. In terms of spectrum, the ADHD-trait group showed significantly reduced theta power than the control group. In contrast, the ADHD-trait group exhibited an increased alpha power compared to the control group with the 250-1000 ms interval after stimulus onset. In terms of the PLV, the ADHD-trait group showed significantly weaker theta phase synchrony and fewer connection numbers in frontal-occipital areas than the control group. In terms of the theta brain network, the ADHD-trait group showed a significantly lower clustering coefficient and longer characteristic path length than the control group for the theta band. The present results indicate that college students with ADHD traits have deficits in spatial working memory and that these abnormal activities in neural oscillation, functional connectivity, and the network may contribute to spatial working memory deficits.
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Affiliation(s)
- Kyoung-Mi Jang
- Department of Psychology, Sungshin Women's University, Seoul, South Korea
| | - Myung-Sun Kim
- Department of Psychology, Sungshin Women's University, Seoul, South Korea
| | - Do-Won Kim
- Department of Biomedical Engineering, Chonnam National University, Yeosu, South Korea
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15
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Fanuel L, Plancher G, Piolino P. Using More Ecological Paradigms to Investigate Working Memory: Strengths, Limitations and Recommendations. Front Hum Neurosci 2020; 14:148. [PMID: 32431601 PMCID: PMC7213077 DOI: 10.3389/fnhum.2020.00148] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2019] [Accepted: 04/06/2020] [Indexed: 11/13/2022] Open
Affiliation(s)
- Lison Fanuel
- Cognitive Mechanisms Research Laboratory, Université Lyon 2, Bron, France.,Lyon Neuroscience Research Center (CRNL), INSERM U1028, CNRS UMR5292, Université Lyon 1, Université de Lyon, Lyon, France
| | - Gaën Plancher
- Cognitive Mechanisms Research Laboratory, Université Lyon 2, Bron, France
| | - Pascale Piolino
- Laboratoire Mémoire, Cerveau et Cognition, MC2Lab 7536, Université de Paris, Paris, France.,Institut de Psychologie, Université de Paris, Boulogne Billancourt, France.,Institut Universitaire de France, Paris, France
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16
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Muñoz JE, Quintero L, Stephens CL, Pope AT. A Psychophysiological Model of Firearms Training in Police Officers: A Virtual Reality Experiment for Biocybernetic Adaptation. Front Psychol 2020; 11:683. [PMID: 32373026 PMCID: PMC7179757 DOI: 10.3389/fpsyg.2020.00683] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2019] [Accepted: 03/20/2020] [Indexed: 12/20/2022] Open
Abstract
Crucial elements for police firearms training include mastering very specific psychophysiological responses associated with controlled breathing while shooting. Under high-stress situations, the shooter is affected by responses of the sympathetic nervous system that can impact respiration. This research focuses on how frontal oscillatory brainwaves and cardiovascular responses of trained police officers (N = 10) are affected during a virtual reality (VR) firearms training routine. We present data from an experimental study wherein shooters were interacting in a VR-based training simulator designed to elicit psychophysiological changes under easy, moderate and frustrating difficulties. Outcome measures in this experiment include electroencephalographic and heart rate variability (HRV) parameters, as well as performance metrics from the VR simulator. Results revealed that specific frontal areas of the brain elicited different responses during resting states when compared with active shooting in the VR simulator. Moreover, sympathetic signatures were found in the HRV parameters (both time and frequency) reflecting similar differences. Based on the experimental findings, we propose a psychophysiological model to aid the design of a biocybernetic adaptation layer that creates real-time modulations in simulation difficulty based on targeted physiological responses.
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Affiliation(s)
- John E Muñoz
- Department of Systems Design Engineering, University of Waterloo, Waterloo, ON, Canada
| | - Luis Quintero
- Department of Computer and Systems Sciences, Stockholm University, Stockholm, Sweden
| | - Chad L Stephens
- Langley Research Center, National Aeronautics and Space Administration, Hampton, VA, United States
| | - Alan T Pope
- Langley Research Center, National Aeronautics and Space Administration, Hampton, VA, United States.,Learning Engagement Technologies, Poquoson, VA, United States
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17
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Zhou Y, Wen D, Lu H, Yao W, Liu Y, Qian W, Yuan J. The Current Research of Spatial Cognitive Evaluation and Training With Brain-Computer Interface and Virtual Reality. Front Neurosci 2020; 13:1439. [PMID: 32116484 PMCID: PMC7025557 DOI: 10.3389/fnins.2019.01439] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2019] [Accepted: 12/20/2019] [Indexed: 11/28/2022] Open
Affiliation(s)
- Yanhong Zhou
- School of Information Science and Engineering, Yanshan University, Qinhuangdao, China
- School of Mathematics and Information Science and Technology, Hebei Normal University of Science and Technology, Qinhuangdao, China
| | - Dong Wen
- School of Information Science and Engineering, Yanshan University, Qinhuangdao, China
- The Key Laboratory for Computer Virtual Technology and System Integration of Hebei Province, Yanshan University, Qinhuangdao, China
| | - Huibin Lu
- School of Information Science and Engineering, Yanshan University, Qinhuangdao, China
- The Key Laboratory of Information Transmission and Signal Processing of Hebei Province, Yanshan University, Qinhuangdao, China
| | - Wang Yao
- School of Information Science and Engineering, Yanshan University, Qinhuangdao, China
- The Key Laboratory for Computer Virtual Technology and System Integration of Hebei Province, Yanshan University, Qinhuangdao, China
| | - Yijun Liu
- School of Science, Yanshan University, Qinhuangdao, China
| | - Wenbo Qian
- School of Information Science and Engineering, Yanshan University, Qinhuangdao, China
- The Key Laboratory of Information Transmission and Signal Processing of Hebei Province, Yanshan University, Qinhuangdao, China
| | - Jingpeng Yuan
- School of Information Science and Engineering, Yanshan University, Qinhuangdao, China
- The Key Laboratory for Computer Virtual Technology and System Integration of Hebei Province, Yanshan University, Qinhuangdao, China
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18
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Tanu, Kakkar D. Influence of Emotional Imagery on Risk Perception and Decision Making in Autism Spectrum Disorder. NEUROPHYSIOLOGY+ 2019. [DOI: 10.1007/s11062-019-09822-8] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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19
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Muthukrishnan SP, Soni S, Sharma R. Brain Networks Communicate Through Theta Oscillations to Encode High Load in a Visuospatial Working Memory Task: An EEG Connectivity Study. Brain Topogr 2019; 33:75-85. [PMID: 31650366 DOI: 10.1007/s10548-019-00739-3] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2019] [Accepted: 10/18/2019] [Indexed: 10/25/2022]
Abstract
The encoding of visuospatial information is the foremost and indispensable step which determines the outcome in a visuospatial working memory (VSWM) task. It is considered to play a crucial role in limiting our ability to attend and process only 3-5 integrated items of information. Despite its importance in determining VSWM performance, the neural mechanisms underlying VSWM encoding have not been clearly differentiated from those involved during VSWM retention, manipulation and/or retrieval. The high temporal resolution of electroencephalography (EEG) and improved spatial resolution with dense array data acquisition makes it an ideal tool to study the dynamics in the functional brain connectivity during a cognitive task. In the present study, the changes in the functional brain connectivity due to memory load during VSWM encoding were studied using 128-channel EEG. Lagged linear coherence (LagR) was computed between 84 regions of interest (ROIs) defined according to the Brodmann areas for seven EEG frequency bands: delta (2-4 Hz), theta (4-8 Hz), alpha 1 (8-10.5 Hz), alpha 2 (10.5-13 Hz), beta 1 (13-20 Hz), beta 2 (20-30 Hz), and gamma (30-45 Hz). Interestingly, out of seven EEG frequency bands investigated in the current study, LagR of only theta band varied significantly in 13 brain connections due to memory load during VSWM encoding. LagR of theta band increased significantly at high memory load when compared to low memory load in twelve brain connections with the maximum change observed between right cuneus and right middle temporal gyrus (Cohen's d = 0.836), indicating the integration of brain processes to confront the increase in memory demands. Theta LagR decreased significantly between left postcentral gyrus and right precentral gyrus at high memory load as compared to low memory load, which might have a role for sustaining attention during encoding. Change in the LagR values due to memory load between fusiform gyrus and lingual gyrus in the right hemisphere had a positive correlation (r = 0.464, p = 0.003) with the error rate, signifying the crucial role played by these two regions in predicting the performance. The current study has not only identified the neural connections that are responsible for the formation of working memory traces during VSWM encoding, but also support the notion that encoding is a rate-limiting process underlying our memory capacity limit.
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Affiliation(s)
- Suriya Prakash Muthukrishnan
- Stress and Cognitive Electroimaging Laboratory, Department of Physiology, All India Institute of Medical Sciences, New Delhi, 110029, India
| | - Sunaina Soni
- Stress and Cognitive Electroimaging Laboratory, Department of Physiology, All India Institute of Medical Sciences, New Delhi, 110029, India
| | - Ratna Sharma
- Stress and Cognitive Electroimaging Laboratory, Department of Physiology, All India Institute of Medical Sciences, New Delhi, 110029, India.
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20
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A Comparison of Mental Workload in Individuals with Transtibial and Transfemoral Lower Limb Loss during Dual-Task Walking under Varying Demand. J Int Neuropsychol Soc 2019; 25:985-997. [PMID: 31462338 DOI: 10.1017/s1355617719000602] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
OBJECTIVES This study aimed to evaluate the influence of lower limb loss (LL) on mental workload by assessing neurocognitive measures in individuals with unilateral transtibial (TT) versus those with transfemoral (TF) LL while dual-task walking under varying cognitive demand. METHODS Electroencephalography (EEG) was recorded as participants performed a task of varying cognitive demand while being seated or walking (i.e., varying physical demand). RESULTS The findings revealed both groups of participants (TT LL vs. TF LL) exhibited a similar EEG theta synchrony response as either the cognitive or the physical demand increased. Also, while individuals with TT LL maintained similar performance on the cognitive task during seated and walking conditions, those with TF LL exhibited performance decrements (slower response times) on the cognitive task during the walking in comparison to the seated conditions. Furthermore, those with TF LL neither exhibited regional differences in EEG low-alpha power while walking, nor EEG high-alpha desynchrony as a function of cognitive task difficulty while walking. This lack of alpha modulation coincided with no elevation of theta/alpha ratio power as a function of cognitive task difficulty in the TF LL group. CONCLUSIONS This work suggests that both groups share some common but also different neurocognitive features during dual-task walking. Although all participants were able to recruit neural mechanisms critical for the maintenance of cognitive-motor performance under elevated cognitive or physical demands, the observed differences indicate that walking with a prosthesis, while concurrently performing a cognitive task, imposes additional cognitive demand in individuals with more proximal levels of amputation.
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21
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Pruziner AL, Shaw EP, Rietschel JC, Hendershot BD, Miller MW, Wolf EJ, Hatfield BD, Dearth CL, Gentili RJ. Biomechanical and neurocognitive performance outcomes of walking with transtibial limb loss while challenged by a concurrent task. Exp Brain Res 2018; 237:477-491. [PMID: 30460393 DOI: 10.1007/s00221-018-5419-8] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2018] [Accepted: 10/26/2018] [Indexed: 01/19/2023]
Abstract
Individuals who have sustained loss of a lower limb may require adaptations in sensorimotor and control systems to effectively utilize a prosthesis, and the interaction of these systems during walking is not clearly understood for this patient population. The aim of this study was to concurrently evaluate temporospatial gait mechanics and cortical dynamics in a population with and without unilateral transtibial limb loss (TT). Utilizing motion capture and electroencephalography, these outcomes were simultaneously collected while participants with and without TT completed a concurrent task of varying difficulty (low- and high-demand) while seated and walking. All participants demonstrated a wider base of support and more stable gait pattern when walking and completing the high-demand concurrent task. The cortical dynamics were similarly modulated by the task demand for both groups, to include a decrease in the novelty-P3 component and increase in the frontal theta/parietal alpha ratio power when completing the high-demand task, although specific differences were also observed. These findings confirm and extend prior efforts indicating that dual-task walking can negatively affect walking mechanics and/or neurocognitive performance. However, there may be limited additional cognitive and/or biomechanical impact of utilizing a prosthesis in a stable, protected environment in TT who have acclimated to ambulating with a prosthesis. These results highlight the need for future work to evaluate interactions between these cognitive-motor control systems for individuals with more proximal levels of lower limb loss, and in more challenging (ecologically valid) environments.
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Affiliation(s)
- Alison L Pruziner
- DoD-VA Extremity Trauma and Amputation Center of Excellence, Bethesda, MD, USA. .,Department of Rehabilitation, Walter Reed National Military Medical Center, Bethesda, MD, USA. .,Department of Rehabilitation Medicine, Uniformed Services University of the Health Sciences, Bethesda, MD, USA.
| | - Emma P Shaw
- Department of Rehabilitation, Walter Reed National Military Medical Center, Bethesda, MD, USA.,Department of Kinesiology, School of Public Health, University of Maryland, College Park, MD, USA.,Neuroscience and Cognitive Science Program, University of Maryland, College Park, MD, USA
| | - Jeremy C Rietschel
- Department of Kinesiology, School of Public Health, University of Maryland, College Park, MD, USA.,Baltimore Veterans Administration Medical Center, Baltimore, MD, USA
| | - Brad D Hendershot
- DoD-VA Extremity Trauma and Amputation Center of Excellence, Bethesda, MD, USA.,Department of Rehabilitation, Walter Reed National Military Medical Center, Bethesda, MD, USA.,Department of Rehabilitation Medicine, Uniformed Services University of the Health Sciences, Bethesda, MD, USA
| | - Matthew W Miller
- Center for Neuroscience, School of Kinesiology, Auburn University, Auburn, AL, USA
| | - Erik J Wolf
- DoD-VA Extremity Trauma and Amputation Center of Excellence, Bethesda, MD, USA.,Department of Rehabilitation, Walter Reed National Military Medical Center, Bethesda, MD, USA.,Department of Rehabilitation Medicine, Uniformed Services University of the Health Sciences, Bethesda, MD, USA
| | - Bradley D Hatfield
- Department of Kinesiology, School of Public Health, University of Maryland, College Park, MD, USA.,Neuroscience and Cognitive Science Program, University of Maryland, College Park, MD, USA
| | - Christopher L Dearth
- DoD-VA Extremity Trauma and Amputation Center of Excellence, Bethesda, MD, USA.,Department of Rehabilitation, Walter Reed National Military Medical Center, Bethesda, MD, USA.,Department of Rehabilitation Medicine, Uniformed Services University of the Health Sciences, Bethesda, MD, USA.,Department of Surgery, Uniformed Services University of the Health Sciences, Bethesda, MD, USA
| | - Rodolphe J Gentili
- Department of Kinesiology, School of Public Health, University of Maryland, College Park, MD, USA.,Neuroscience and Cognitive Science Program, University of Maryland, College Park, MD, USA.,Maryland Robotics Center, University of Maryland, College Park, MD, USA
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22
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Jaquess KJ, Lo LC, Oh H, Lu C, Ginsberg A, Tan YY, Lohse KR, Miller MW, Hatfield BD, Gentili RJ. Changes in Mental Workload and Motor Performance Throughout Multiple Practice Sessions Under Various Levels of Task Difficulty. Neuroscience 2018; 393:305-318. [PMID: 30266685 DOI: 10.1016/j.neuroscience.2018.09.019] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2018] [Revised: 09/12/2018] [Accepted: 09/17/2018] [Indexed: 11/28/2022]
Abstract
The allocation of mental workload is critical to maintain cognitive-motor performance under various demands. While mental workload has been investigated during performance, limited efforts have examined it during cognitive-motor learning, while none have concurrently manipulated task difficulty. It is reasonable to surmise that the difficulty level at which a skill is practiced would impact the rate of skill acquisition and also the rate at which mental workload is reduced during learning (relatively slowed for challenging compared to easier tasks). This study aimed to monitor mental workload by assessing cortical dynamics during a task practiced under two difficulty levels over four days while perceived task demand, performance, and electroencephalography (EEG) were collected. As expected, self-reported mental workload was reduced, greater working memory engagement via EEG theta synchrony was observed, and reduced cortical activation, as indexed by progressive EEG alpha synchrony was detected during practice. Task difficulty was positively related to the magnitude of alpha desynchrony and accompanied by elevations in the theta-alpha ratio. Counter to expectation, the absence of an interaction between task difficulty and practice days for both theta and alpha power indicates that the refinement of mental processes throughout learning occurred at a comparable rate for both levels of difficulty. Thus, the assessment of brain dynamics was sensitive to the rate of change of cognitive workload with practice, but not to the degree of difficulty. Future work should consider a broader range of task demands and additional measures of brain processes to further assess this phenomenon.
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Affiliation(s)
- Kyle J Jaquess
- Department of Kinesiology, School of Public Health, University of Maryland, College Park, MD, USA
| | - Li-Chuan Lo
- Department of Kinesiology, School of Public Health, University of Maryland, College Park, MD, USA
| | - Hyuk Oh
- Department of Kinesiology, School of Public Health, University of Maryland, College Park, MD, USA; Neuroscience and Cognitive Science Program, University of Maryland, College Park, MD, USA
| | - Calvin Lu
- Department of Kinesiology, School of Public Health, University of Maryland, College Park, MD, USA
| | - Andrew Ginsberg
- Department of Kinesiology, School of Public Health, University of Maryland, College Park, MD, USA
| | - Ying Ying Tan
- Department of Kinesiology, School of Public Health, University of Maryland, College Park, MD, USA; Neuroscience and Cognitive Science Program, University of Maryland, College Park, MD, USA; Defense Science and Technology Agency, Singapore
| | - Keith R Lohse
- Department of Health, Kinesiology, and Recreation, University of Utah, Salt Lake City, UT, USA
| | | | - Bradley D Hatfield
- Department of Kinesiology, School of Public Health, University of Maryland, College Park, MD, USA; Neuroscience and Cognitive Science Program, University of Maryland, College Park, MD, USA
| | - Rodolphe J Gentili
- Department of Kinesiology, School of Public Health, University of Maryland, College Park, MD, USA; Neuroscience and Cognitive Science Program, University of Maryland, College Park, MD, USA; Maryland Robotics Center, University of Maryland, College Park, MD, USA.
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23
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Measurement of attentional reserve and mental effort for cognitive workload assessment under various task demands during dual-task walking. Biol Psychol 2018; 134:39-51. [DOI: 10.1016/j.biopsycho.2018.01.009] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2016] [Revised: 09/06/2017] [Accepted: 01/16/2018] [Indexed: 10/18/2022]
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24
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Gentili RJ, Jaquess KJ, Shuggi IM, Shaw EP, Oh H, Lo LC, Tan YY, Domingues CA, Blanco JA, Rietschel JC, Miller MW, Hatfield BD. Combined assessment of attentional reserve and cognitive-motor effort under various levels of challenge with a dry EEG system. Psychophysiology 2018; 55:e13059. [DOI: 10.1111/psyp.13059] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2017] [Revised: 08/31/2017] [Accepted: 11/02/2017] [Indexed: 11/28/2022]
Affiliation(s)
- Rodolphe J. Gentili
- Department of Kinesiology, School of Public Health; University of Maryland; College Park Maryland USA
- Program in Neuroscience and Cognitive Science; University of Maryland; College Park Maryland USA
- Maryland Robotics Center; University of Maryland; College Park Maryland USA
| | - Kyle J. Jaquess
- Department of Kinesiology, School of Public Health; University of Maryland; College Park Maryland USA
- Program in Neuroscience and Cognitive Science; University of Maryland; College Park Maryland USA
| | - Isabelle M. Shuggi
- Department of Kinesiology, School of Public Health; University of Maryland; College Park Maryland USA
- Program in Neuroscience and Cognitive Science; University of Maryland; College Park Maryland USA
| | - Emma P. Shaw
- Department of Kinesiology, School of Public Health; University of Maryland; College Park Maryland USA
- Program in Neuroscience and Cognitive Science; University of Maryland; College Park Maryland USA
| | - Hyuk Oh
- Department of Kinesiology, School of Public Health; University of Maryland; College Park Maryland USA
- Program in Neuroscience and Cognitive Science; University of Maryland; College Park Maryland USA
| | - Li-Chuan Lo
- Department of Kinesiology, School of Public Health; University of Maryland; College Park Maryland USA
| | - Ying Ying Tan
- Department of Kinesiology, School of Public Health; University of Maryland; College Park Maryland USA
- Program in Neuroscience and Cognitive Science; University of Maryland; College Park Maryland USA
| | - Clayton A. Domingues
- Department of Kinesiology, School of Public Health; University of Maryland; College Park Maryland USA
- Department of Neurology; Federal Fluminense University; Niterói Brazil
- Special Operations Instruction Center; Niterói Brazil
| | - Justin A. Blanco
- Department of Electrical and Computer Engineering; United States Naval Academy; Annapolis Maryland USA
| | - Jeremy C. Rietschel
- Veterans Health Administration; Maryland Exercise and Robotics Center of Excellence; Baltimore Maryland USA
| | | | - Bradley D. Hatfield
- Department of Kinesiology, School of Public Health; University of Maryland; College Park Maryland USA
- Program in Neuroscience and Cognitive Science; University of Maryland; College Park Maryland USA
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25
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Abstract
Research into sports-related concussion (SRC) or brain injury has vastly expanded our knowledge of the connection between brain activity and behavioral outcomes. Historical examination of concussion reveals components of structural changes in the brain resulting from injury. A constellation of clinical symptoms is typically present following concussion for several days and weeks. However, the intersection of structural changes and clinical examination still remains elusive to medical professionals. With emerging technologies and modalities such as quantitative electroencephalography (EEG), functional magnetic resonance imaging (fMRI), virtual reality (VR), and the study of movement, we can better understand the brain–behavior relationship on clinical findings post-injury. Our advancement in SRC study using athletics provides a unique window into the advances in our ability to study this public health crisis. SRC also allows us to understand how athletics and exercise influence brain health. The evolution of SRC diagnosis, treatment, and management informs our current abilities in the study of the brain.
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26
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Binaural auditory beats affect long-term memory. PSYCHOLOGICAL RESEARCH 2017; 83:1124-1136. [DOI: 10.1007/s00426-017-0959-2] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2017] [Accepted: 12/06/2017] [Indexed: 10/18/2022]
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27
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Ahmad RF, Malik AS, Kamel N, Reza F, Abdullah JM. Simultaneous EEG-fMRI for working memory of the human brain. AUSTRALASIAN PHYSICAL & ENGINEERING SCIENCES IN MEDICINE 2016; 39:363-78. [PMID: 27043850 DOI: 10.1007/s13246-016-0438-x] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/10/2015] [Accepted: 03/14/2016] [Indexed: 02/06/2023]
Abstract
Memory plays an important role in human life. Memory can be divided into two categories, i.e., long term memory and short term memory (STM). STM or working memory (WM) stores information for a short span of time and it is used for information manipulations and fast response activities. WM is generally involved in the higher cognitive functions of the brain. Different studies have been carried out by researchers to understand the WM process. Most of these studies were based on neuroimaging modalities like fMRI, EEG, MEG etc., which use standalone processes. Each neuroimaging modality has some pros and cons. For example, EEG gives high temporal resolution but poor spatial resolution. On the other hand, the fMRI results have a high spatial resolution but poor temporal resolution. For a more in depth understanding and insight of what is happening inside the human brain during the WM process or during cognitive tasks, high spatial as well as high temporal resolution is desirable. Over the past decade, researchers have been working to combine different modalities to achieve a high spatial and temporal resolution at the same time. Developments of MRI compatible EEG equipment in recent times have enabled researchers to combine EEG-fMRI successfully. The research publications in simultaneous EEG-fMRI have been increasing tremendously. This review is focused on the WM research involving simultaneous EEG-fMRI data acquisition and analysis. We have covered the simultaneous EEG-fMRI application in WM and data processing. Also, it adds to potential fusion methods which can be used for simultaneous EEG-fMRI for WM and cognitive tasks.
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Affiliation(s)
- Rana Fayyaz Ahmad
- Centre for Intelligent Signal and Imaging Research (CISIR), Tronoh, Malaysia. .,Department of Electrical and Electronic Engineering, Universiti Teknologi PETRONAS, 32610, Bandar Seri Iskandar, Perak, Malaysia.
| | - Aamir Saeed Malik
- Centre for Intelligent Signal and Imaging Research (CISIR), Tronoh, Malaysia. .,Department of Electrical and Electronic Engineering, Universiti Teknologi PETRONAS, 32610, Bandar Seri Iskandar, Perak, Malaysia.
| | - Nidal Kamel
- Centre for Intelligent Signal and Imaging Research (CISIR), Tronoh, Malaysia.,Department of Electrical and Electronic Engineering, Universiti Teknologi PETRONAS, 32610, Bandar Seri Iskandar, Perak, Malaysia
| | - Faruque Reza
- Department of Neurosciences, Universiti Sains Malaysia, Kubang Kerian, 16150, Kota Bharu, Kelantan, Malaysia.,Centre for Neuroscience Services and Research, Universiti Sains Malaysia, Kubang Kerian, 16150, Kota Bharu, Kelantan, Malaysia
| | - Jafri Malin Abdullah
- Department of Neurosciences, Universiti Sains Malaysia, Kubang Kerian, 16150, Kota Bharu, Kelantan, Malaysia.,Centre for Neuroscience Services and Research, Universiti Sains Malaysia, Kubang Kerian, 16150, Kota Bharu, Kelantan, Malaysia
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28
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Wang J, Yi M, Zhang C, Bian Z, Wan Y, Chen R, Li X. Cortical activities of heat-sensitization responses in suspended moxibustion: an EEG source analysis with sLORETA. Cogn Neurodyn 2015; 9:581-8. [PMID: 26557928 DOI: 10.1007/s11571-015-9349-x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2014] [Revised: 06/03/2015] [Accepted: 07/09/2015] [Indexed: 11/28/2022] Open
Abstract
Moxibustion is under active research as a complementary and alternative treatment for various diseases such as pain. "Heat-sensitization" responses have been reported during suspended moxibustion, whose occurrence is associated with significantly better therapeutic effects. The present study aimed to investigate the cortical activities of this interesting phenomenon by a standardized low-resolution brain electromagnetic tomography. We performed electroencephalography recording in a group of patients with chronic low back pain before, during, and after moxibustion treatment at Yaoyangguan (DU3) areas. 11 out of 21 subjects experienced strong heat-sensitization during moxibustion, which were accompanied with significant decreases of current densities in the beta frequency bands in prefrontal, primary and second somatosensory, and cingulate cortices, as well as increased current densities in the alpha2 band in the left insula. No changes were detected in patients without sensitization responses, or in the post-moxibustion phase of either group. These data indicated widespread activity changes across different frequency bands during heat-sensitization. Cortical oscillatory activities could be used to evaluate the "heat-sensitization" responses during suspended moxibustion.
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Affiliation(s)
- Juan Wang
- Institute of Electrical Engineering, Yanshan University, Qinhuangdao, 066004 People's Republic of China
| | - Ming Yi
- Neuroscience Research Institute, Peking University, 38 Xueyuan Road, Beijing, 100191 People's Republic of China
| | - Chan Zhang
- Neuroscience Research Institute, Peking University, 38 Xueyuan Road, Beijing, 100191 People's Republic of China
| | - Zhijie Bian
- Institute of Electrical Engineering, Yanshan University, Qinhuangdao, 066004 People's Republic of China
| | - You Wan
- Neuroscience Research Institute, Peking University, 38 Xueyuan Road, Beijing, 100191 People's Republic of China ; Key Laboratory for Neuroscience, Ministry of Education/National Health and Family Planning Commission, Peking University, 38 Xueyuan Road, Beijing, 100191 People's Republic of China
| | - Rixin Chen
- Affiliated Hospital of Jiangxi University of TCM, Nanchang, 330006 People's Republic of China
| | - Xiaoli Li
- Institute of Electrical Engineering, Yanshan University, Qinhuangdao, 066004 People's Republic of China
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29
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Lin CT, Chiu TC, Gramann K. EEG correlates of spatial orientation in the human retrosplenial complex. Neuroimage 2015; 120:123-32. [PMID: 26163801 DOI: 10.1016/j.neuroimage.2015.07.009] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2015] [Revised: 06/12/2015] [Accepted: 07/03/2015] [Indexed: 11/19/2022] Open
Abstract
Studies on spatial navigation reliably demonstrate that the retrosplenial complex (RSC) plays a pivotal role for allocentric spatial information processing by transforming egocentric and allocentric spatial information into the respective other spatial reference frame (SRF). While more and more imaging studies investigate the role of the RSC in spatial tasks, high temporal resolution measures such as electroencephalography (EEG) are missing. To investigate the function of the RSC in spatial navigation with high temporal resolution we used EEG to analyze spectral perturbations during navigation based on allocentric and egocentric SRF. Participants performed a path integration task in a clearly structured virtual environment providing allothetic information. Continuous EEG recordings were decomposed by independent component analysis (ICA) with subsequent source reconstruction of independent time source series using equivalent dipole modeling. Time-frequency transformation was used to investigate reference frame-specific orientation processes during navigation as compared to a control condition with identical visual input but no orientation task. Our results demonstrate that navigation based on an egocentric reference frame recruited a network including the parietal, motor, and occipital cortices with dominant perturbations in the alpha band and theta modulation in frontal cortex. Allocentric navigation was accompanied by performance-related desynchronization of the 8-13 Hz frequency band and synchronization in the 12-14 Hz band in the RSC. The results support the claim that the retrosplenial complex is central to translating egocentric spatial information into allocentric reference frames. Modulations in different frequencies with different time courses in the RSC further provide first evidence of two distinct neural processes reflecting translation of spatial information based on distinct reference frames and the computation of heading changes.
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Affiliation(s)
- C-T Lin
- Brain Research Center, National Chiao-Tung University, Hsinchu, Taiwan; Department of Electrical Computer Engineering, Department of Computer Science, National Chiao-Tung University, Hsinchu, Taiwan; Faculty of Engineering and Information Technology, University of Technology, Sydney, Australia
| | - T-C Chiu
- Brain Research Center, National Chiao-Tung University, Hsinchu, Taiwan; Department of Electrical Computer Engineering, Department of Computer Science, National Chiao-Tung University, Hsinchu, Taiwan
| | - K Gramann
- Biological Psychology and Neuroergonomics, Technische Universitaet Berlin, Germany; Center for Advanced Neurological Engineering, University of CA, San Diego, USA
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30
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Gay M, Ray W, Johnson B, Teel E, Geronimo A, Slobounov S. Feasibility of EEG Measures in Conjunction With Light Exercise for Return-to-Play Evaluation After Sports-Related Concussion. Dev Neuropsychol 2015; 40:248-53. [PMID: 26179490 PMCID: PMC4511960 DOI: 10.1080/87565641.2015.1014486] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
Current clinical assessment of sports-related concussion and the determination of "Return-to-Play" lacks assessment of the pathophysiological processes affecting the concussed brain. The objective of this study was to demonstrate the feasibility of electroencephalogram measures that detect neuronal damage and monitor the healing process, giving an improved approximation of pathophysiological recovery.
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Affiliation(s)
- Michael Gay
- a Department of Kinesiology , The Pennsylvania State University , University Park , Pennsylvania
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31
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Slobounov SM, Ray W, Johnson B, Slobounov E, Newell KM. Modulation of cortical activity in 2D versus 3D virtual reality environments: an EEG study. Int J Psychophysiol 2014; 95:254-60. [PMID: 25448267 DOI: 10.1016/j.ijpsycho.2014.11.003] [Citation(s) in RCA: 75] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2014] [Revised: 11/02/2014] [Accepted: 11/04/2014] [Indexed: 11/15/2022]
Abstract
There is a growing empirical evidence that virtual reality (VR) is valuable for education, training, entertaining and medical rehabilitation due to its capacity to represent real-life events and situations. However, the neural mechanisms underlying behavioral confounds in VR environments are still poorly understood. In two experiments, we examined the effect of fully immersive 3D stereoscopic presentations and less immersive 2D VR environments on brain functions and behavioral outcomes. In Experiment 1 we examined behavioral and neural underpinnings of spatial navigation tasks using electroencephalography (EEG). In Experiment 2, we examined EEG correlates of postural stability and balance. Our major findings showed that fully immersive 3D VR induced a higher subjective sense of presence along with enhanced success rate of spatial navigation compared to 2D. In Experiment 1 power of frontal midline EEG (FM-theta) was significantly higher during the encoding phase of route presentation in the 3D VR. In Experiment 2, the 3D VR resulted in greater postural instability and modulation of EEG patterns as a function of 3D versus 2D environments. The findings support the inference that the fully immersive 3D enriched-environment requires allocation of more brain and sensory resources for cognitive/motor control during both tasks than 2D presentations. This is further evidence that 3D VR tasks using EEG may be a promising approach for performance enhancement and potential applications in clinical/rehabilitation settings.
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Affiliation(s)
- Semyon M Slobounov
- Department of Kinesiology, The Pennsylvania State University, 276 Recreation Building, University Park, PA 16802, USA.
| | - William Ray
- Department of Psychology, The Pennsylvania State University, 356 Moore Building, University Park, PA 16802, USA
| | - Brian Johnson
- Department of Kinesiology, The Pennsylvania State University, 276 Recreation Building, University Park, PA 16802, USA
| | - Elena Slobounov
- Department of Kinesiology, The Pennsylvania State University, 276 Recreation Building, University Park, PA 16802, USA
| | - Karl M Newell
- Department of Kinesiology, The Pennsylvania State University, 276 Recreation Building, University Park, PA 16802, USA
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32
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Shourie N, Firoozabadi M, Badie K. Analysis of EEG signals related to artists and nonartists during visual perception, mental imagery, and rest using approximate entropy. BIOMED RESEARCH INTERNATIONAL 2014; 2014:764382. [PMID: 25133180 PMCID: PMC4123523 DOI: 10.1155/2014/764382] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/16/2014] [Revised: 06/02/2014] [Accepted: 06/17/2014] [Indexed: 11/17/2022]
Abstract
In this paper, differences between multichannel EEG signals of artists and nonartists were analyzed during visual perception and mental imagery of some paintings and at resting condition using approximate entropy (ApEn). It was found that ApEn is significantly higher for artists during the visual perception and the mental imagery in the frontal lobe, suggesting that artists process more information during these conditions. It was also observed that ApEn decreases for the two groups during the visual perception due to increasing mental load; however, their variation patterns are different. This difference may be used for measuring progress in novice artists. In addition, it was found that ApEn is significantly lower during the visual perception than the mental imagery in some of the channels, suggesting that visual perception task requires more cerebral efforts.
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Affiliation(s)
- Nasrin Shourie
- Department of Biomedical Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran
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33
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Shourie N, Firoozabadi SMP, Badie K. Investigation of EEG Alpha Rhythm of Artists and Nonartists During Visual Perception, Mental Imagery, and Rest. ACTA ACUST UNITED AC 2013. [DOI: 10.1080/10874208.2013.813180] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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34
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Nemmi F, Boccia M, Piccardi L, Galati G, Guariglia C. Segregation of neural circuits involved in spatial learning in reaching and navigational space. Neuropsychologia 2013; 51:1561-70. [PMID: 23615031 DOI: 10.1016/j.neuropsychologia.2013.03.031] [Citation(s) in RCA: 66] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2012] [Revised: 03/22/2013] [Accepted: 03/23/2013] [Indexed: 11/18/2022]
Affiliation(s)
- Federico Nemmi
- Neuropsychology Center, Santa Lucia Foundation, Rome, Italy.
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35
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Hori S, Matsumoto J, Hori E, Kuwayama N, Ono T, Kuroda S, Nishijo H. Alpha- and Theta-Range Cortical Synchronization and Corticomuscular Coherence During Joystick Manipulation in a Virtual Navigation Task. Brain Topogr 2013; 26:591-605. [DOI: 10.1007/s10548-013-0304-z] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2012] [Accepted: 06/14/2013] [Indexed: 10/26/2022]
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36
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Error detection and error memory in spatial navigation as reflected by electrodermal activity. Cogn Process 2013; 14:377-89. [PMID: 23700191 DOI: 10.1007/s10339-013-0567-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2012] [Accepted: 05/08/2013] [Indexed: 10/26/2022]
Abstract
The study investigated spatial navigation by means of electrodermal activity (EDA). Two groups of healthy subjects (group 1, age <38; group 2, age ≥ 38) were recorded during navigation through two 3-D virtual mazes differing in difficulty, that is, Maze Simple (MazeS) and Maze Complex (MazeC). Our results show (1) an effect of difficulty, that is, larger skin conductance responses (SCRs) and slower velocity profiles while navigating through MazeC as compared to MazeS. (2) An effect of age, that is, larger SCRs and faster velocity profiles in younger subjects (group 1) compared to older subjects (group 2). (3) An effect of maze region, that is, SCRs increased when subjects entered dead ends with group 1 (young group) decreasing in velocity, whereas group 2 (old group) increased in velocity. (4) And an error memory effect, that is, subjects who remembered an error at a given decision point (crossroads preceding dead ends in MazeC) from previous trials, and then if they did not repeat that error, elicited decreased SCRs as compared to subjects who did not remember and subsequently repeated an error. The latter aspect is the most impactful as it shows that EDA is able to reflect error detection and memory during spatial navigation. Our data designate EDA as suitable monitoring tool for identification and differentiation of the affective correlates underlying spatial navigation, which has recently attracted researchers' attention due to its increased use in 3-D virtual environments.
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Gras D, Gyselinck V, Perrussel M, Orriols E, Piolino P. The role of working memory components and visuospatial abilities in route learning within a virtual environment. JOURNAL OF COGNITIVE PSYCHOLOGY 2013. [DOI: 10.1080/20445911.2012.739154] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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38
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Huijbers W, Vannini P, Sperling RA, C M P, Cabeza R, Daselaar SM. Explaining the encoding/retrieval flip: memory-related deactivations and activations in the posteromedial cortex. Neuropsychologia 2012; 50:3764-74. [PMID: 22982484 DOI: 10.1016/j.neuropsychologia.2012.08.021] [Citation(s) in RCA: 82] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2012] [Revised: 08/21/2012] [Accepted: 08/27/2012] [Indexed: 12/13/2022]
Abstract
The posteromedial cortex (PMC) is strongly linked to episodic memory and age-related memory deficits. The PMC shows deactivations during a variety of demanding cognitive tasks as compared to passive baseline conditions and has been associated with the default-mode of the brain. Interestingly, the PMC exhibits opposite levels of functional MRI activity during encoding (learning) and retrieval (remembering), a pattern dubbed the encoding/retrieval flip (E/R-flip). Yet, the exact role of the PMC in memory function has remained unclear. This review discusses the possible neurofunctional and clinical significance of the E/R-flip pattern. Regarding neurofunctional relevance, we will review four hypotheses on PMC function: (1) the internal orienting account, (2) the self-referential processing account, (3) the reallocation account, and (4) the bottom-up attention account. None of these accounts seem to provide a complete explanation for the E/R-flip pattern in PMC. Regarding clinical relevance, we review work on aging and Alzheimer's disease, indicating that amyloid deposits within PMC, years before clinical memory deficits become apparent. High amyloid burden within PMC is associated with detrimental influences on memory encoding, in particular, the attenuation of beneficial PMC deactivations. Finally, we discuss functional subdivisions within PMC that help to provide a more precise picture of the variety of signals observed within PMC. Collective data from anatomical, task-related fMRI and resting-state studies all indicate that the PMC is composed of three main regions, the precuneus, retrosplenial, and posterior cingulate cortex, each with a distinct function. We will conclude with a summary of the findings and provide directions for future research.
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Affiliation(s)
- W Huijbers
- Harvard Medical School, Martinos Center for Biomedical Imaging, Brigham and Women's Hospital, Boston, MA, USA.
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39
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Vannini P, Hedden T, Sullivan C, Sperling RA. Differential functional response in the posteromedial cortices and hippocampus to stimulus repetition during successful memory encoding. Hum Brain Mapp 2012; 34:1568-78. [PMID: 22344847 DOI: 10.1002/hbm.22011] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2011] [Revised: 10/26/2011] [Accepted: 11/14/2011] [Indexed: 12/30/2022] Open
Abstract
The reduction of neural activity in response to repeated stimuli, repetition suppression, is one of the most robust experience-related cortical dynamics known to cognitive neuroscience. Functional magnetic resonance imaging (fMRI) studies during episodic memory encoding have demonstrated repetition suppression in the hippocampus and this reduction has been linked to successful memory formation. An emerging body of functional imaging evidence suggests that the posteromedial cortex, in addition to the medial temporal lobes, may have a pivotal role in successful episodic memory. This area typically deactivates during initial memory encoding, but its functional changes in response to repetitive encoding remain poorly specified. Here, we investigate the repetition-related changes in the posteromedial cortex as well as the hippocampus while the participants underwent an fMRI experiment involving repetitive encoding of face-name pairs. During the first encoding trial of face-name pairs, significant activation in the hippocampus was observed. The second and third encoding trials demonstrated a repetition suppression effect in the hippocampus, indicated by a stepwise decrease of activation. In contrast, the posteromedial cortex demonstrated significant deactivation during the initial encoding trial of face-name pairs. The second and third encoding trials demonstrated a stepwise decrease of deactivation, repetition enhancement, with activity at or above baseline levels in the final encoding trial. These findings demonstrate that hippocampus repetition suppression as well as posteromedial repetition enhancement is related to successful encoding processes and are discussed in relation to the default mode hypothesis as well as potential implications for understanding late-life amnestic disorders.
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Affiliation(s)
- Patrizia Vannini
- Department of Psychiatry, Athinoula A. Martinos Center for Biomedical Imaging, Massachusetts General Hospital, Harvard Medical School, Charlestown, Massachusetts 02129, USA.
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