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Choi M, Kim HC, Youn I, Lee SJ, Lee JH. Use of functional magnetic resonance imaging to identify cortical loci for lower limb movements and their efficacy for individuals after stroke. J Neuroeng Rehabil 2024; 21:58. [PMID: 38627779 PMCID: PMC11020805 DOI: 10.1186/s12984-024-01319-8] [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: 04/06/2023] [Accepted: 01/29/2024] [Indexed: 04/19/2024] Open
Abstract
BACKGROUND Identification of cortical loci for lower limb movements for stroke rehabilitation is crucial for better rehabilitation outcomes via noninvasive brain stimulation by targeting the fine-grained cortical loci of the movements. However, identification of the cortical loci for lower limb movements using functional MRI (fMRI) is challenging due to head motion and difficulty in isolating different types of movement. Therefore, we developed a custom-made MR-compatible footplate and leg cushion to identify the cortical loci for lower limb movements and conducted multivariate analysis on the fMRI data. We evaluated the validity of the identified loci using both fMRI and behavioral data, obtained from healthy participants as well as individuals after stroke. METHODS We recruited 33 healthy participants who performed four different lower limb movements (ankle dorsiflexion, ankle rotation, knee extension, and toe flexion) using our custom-built equipment while fMRI data were acquired. A subgroup of these participants (Dataset 1; n = 21) was used to identify the cortical loci associated with each lower limb movement in the paracentral lobule (PCL) using multivoxel pattern analysis and representational similarity analysis. The identified cortical loci were then evaluated using the remaining healthy participants (Dataset 2; n = 11), for whom the laterality index (LI) was calculated for each lower limb movement using the cortical loci identified for the left and right lower limbs. In addition, we acquired a dataset from 15 individuals with chronic stroke for regression analysis using the LI and the Fugl-Meyer Assessment (FMA) scale. RESULTS The cortical loci associated with the lower limb movements were hierarchically organized in the medial wall of the PCL following the cortical homunculus. The LI was clearer using the identified cortical loci than using the PCL. The healthy participants (mean ± standard deviation: 0.12 ± 0.30; range: - 0.63 to 0.91) exhibited a higher contralateral LI than the individuals after stroke (0.07 ± 0.47; - 0.83 to 0.97). The corresponding LI scores for individuals after stroke showed a significant positive correlation with the FMA scale for paretic side movement in ankle dorsiflexion (R2 = 0.33, p = 0.025) and toe flexion (R2 = 0.37, p = 0.016). CONCLUSIONS The cortical loci associated with lower limb movements in the PCL identified in healthy participants were validated using independent groups of healthy participants and individuals after stroke. Our findings suggest that these cortical loci may be beneficial for the neurorehabilitation of lower limb movement in individuals after stroke, such as in developing effective rehabilitation interventions guided by the LI scores obtained for neuronal activations calculated from the identified cortical loci across the paretic and non-paretic sides of the brain.
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Affiliation(s)
- Minseok Choi
- Department of Brain and Cognitive Engineering, Korea University, Seoul, South Korea
| | - Hyun-Chul Kim
- Department of Artificial Intelligence, Kyungpook National University, Daegu, South Korea
| | - Inchan Youn
- Bionics Research Center, Biomedical Research Division, Korea Institute of Science and Technology, Seoul, South Korea
| | - Song Joo Lee
- Bionics Research Center, Biomedical Research Division, Korea Institute of Science and Technology, Seoul, South Korea.
| | - Jong-Hwan Lee
- Department of Brain and Cognitive Engineering, Korea University, Seoul, South Korea.
- Interdisciplinary Program in Precision Public Health, Korea University, Seoul, South Korea.
- McGovern Institute for Brain Research, Massachusetts Institute of Technology, Boston, Massachusetts, USA.
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Fares-Otero NE, Halligan SL, Vieta E, Heilbronner U. Pupil size as a potential marker of emotion processing in child maltreatment. J Affect Disord 2024; 351:392-395. [PMID: 38290582 DOI: 10.1016/j.jad.2024.01.242] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/30/2023] [Revised: 01/08/2024] [Accepted: 01/26/2024] [Indexed: 02/01/2024]
Affiliation(s)
- Natalia E Fares-Otero
- Bipolar and Depressive Disorders Unit, Department of Psychiatry and Psychology, Hospital Clínic, Institute of Neurosciences (UBNeuro), Department of Medicine, Faculty of Medicine and Health Sciences, University of Barcelona (UB), Barcelona, Catalonia, Spain; Fundació Clínic per a la Recerca Biomèdica (FCRB), Institut d'Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), Network Centre for Biomedical Research in Mental Health (CIBERSAM), Health Institute Carlos III (ISCIII), Barcelona, Catalonia, Spain.
| | - Sarah L Halligan
- Department of Psychology, University of Bath, Bath, UK; Department of Psychiatry and Mental Health, University of Cape Town, Cape Town, South Africa; Department of Psychiatry, Stellenbosch University, Stellenbosch, South Africa
| | - Eduard Vieta
- Bipolar and Depressive Disorders Unit, Department of Psychiatry and Psychology, Hospital Clínic, Institute of Neurosciences (UBNeuro), Department of Medicine, Faculty of Medicine and Health Sciences, University of Barcelona (UB), Barcelona, Catalonia, Spain; Fundació Clínic per a la Recerca Biomèdica (FCRB), Institut d'Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), Network Centre for Biomedical Research in Mental Health (CIBERSAM), Health Institute Carlos III (ISCIII), Barcelona, Catalonia, Spain.
| | - Urs Heilbronner
- Institute of Psychiatric Phenomics and Genomics (IPPG), LMU University Hospital, LMU Munich, Munich, Germany
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Ju U, Wallraven C. Decoding the dynamic perception of risk and speed using naturalistic stimuli: A multivariate, whole-brain analysis. Hum Brain Mapp 2024; 45:e26652. [PMID: 38488473 PMCID: PMC10941534 DOI: 10.1002/hbm.26652] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2023] [Revised: 02/20/2024] [Accepted: 02/25/2024] [Indexed: 03/18/2024] Open
Abstract
Time-resolved decoding of speed and risk perception in car driving is important for understanding the perceptual processes related to driving safety. In this study, we used an fMRI-compatible trackball with naturalistic stimuli to record dynamic ratings of perceived risk and speed and investigated the degree to which different brain regions were able to decode these. We presented participants with first-person perspective videos of cars racing on the same course. These videos varied in terms of subjectively perceived speed and risk profiles, as determined during a behavioral pilot. During the fMRI experiment, participants used the trackball to dynamically rate subjective risk in a first and speed in a second session and assessed overall risk and speed after watching each video. A standard multivariate correlation analysis based on these ratings revealed sparse decodability in visual areas only for the risk ratings. In contrast, the dynamic rating-based correlation analysis uncovered frontal, visual, and temporal region activation for subjective risk and dorsal visual stream and temporal region activation for subjectively perceived speed. Interestingly, further analyses showed that the brain regions for decoding risk changed over time, whereas those for decoding speed remained constant. Overall, our results demonstrate the advantages of time-resolved decoding to help our understanding of the dynamic networks associated with decoding risk and speed perception in realistic driving scenarios.
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Affiliation(s)
- Uijong Ju
- Department of Information DisplayKyung Hee UniversitySeoulSouth Korea
| | - Christian Wallraven
- Department of Brain and Cognitive EngineeringKorea UniversitySouth Korea
- Department of Artificial IntelligenceKorea UniversitySouth Korea
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Schmälzle R, Lim S, Cho HJ, Wu J, Bente G. Examining the exposure-reception-retention link in realistic communication environments via VR and eye-tracking: The VR billboard paradigm. PLoS One 2023; 18:e0291924. [PMID: 38033032 PMCID: PMC10688884 DOI: 10.1371/journal.pone.0291924] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2023] [Accepted: 09/10/2023] [Indexed: 12/02/2023] Open
Abstract
Exposure is key to message effects. No effects can ensue if a health, political, or commercial message is not noticed. Yet, existing research in communication, advertising, and related disciplines often measures 'opportunities for exposure' at an aggregate level, whereas knowing whether recipients were 'actually exposed' to a message requires a micro-level approach. Micro-level research, on the other hand, focuses on message processing and retention, takes place under highly controlled laboratory conditions with forced message exposure, and largely ignores how recipients attend selectively to messages under more natural conditions. Eye-tracking enables us to assess actual exposure, but its previous applications were restricted to screen-based reading paradigms lacking ecological validity or field studies that suffer from limited experimental control. Our solution is to measure eye-tracking within an immersive VR environment that creates the message delivery and reception context. Specifically, we simulate a car ride down a highway alongside which billboards are placed. The VR headset (HP Omnicept Pro) provides an interactive 3D view of the environment and holds a seamlessly integrated binocular eye tracker that records the drivers' gaze and detects all fixations on the billboards. This allows us to quantify the nexus between exposure and reception rigorously, and to link our measures to subsequent memory, i.e., whether messages were remembered, forgotten, or not even encoded. An empirical study shows that incidental memory for messages differs based on participants' gaze behavior while passing the billboards. The study further shows how an experimental manipulation of attentional demands directly impacts drivers' gaze behavior and memory. We discuss the large potential of this paradigm to quantify exposure and message reception in realistic communication environments and the equally promising applications in new media contexts (e.g., the Metaverse).
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Affiliation(s)
- Ralf Schmälzle
- Department of Communication, College of Communication Arts and Sciences, Michigan State University, East Lansing, Michigan, United States of America
| | - Sue Lim
- Department of Communication, College of Communication Arts and Sciences, Michigan State University, East Lansing, Michigan, United States of America
| | - Hee Jung Cho
- Department of Communication, College of Communication Arts and Sciences, Michigan State University, East Lansing, Michigan, United States of America
| | - Juncheng Wu
- Department of Communication, College of Communication Arts and Sciences, Michigan State University, East Lansing, Michigan, United States of America
| | - Gary Bente
- Department of Communication, College of Communication Arts and Sciences, Michigan State University, East Lansing, Michigan, United States of America
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Lee J, Jung M, Lustig N, Lee J. Neural representations of the perception of handwritten digits and visual objects from a convolutional neural network compared to humans. Hum Brain Mapp 2023; 44:2018-2038. [PMID: 36637109 PMCID: PMC9980894 DOI: 10.1002/hbm.26189] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2022] [Revised: 12/04/2022] [Accepted: 12/12/2022] [Indexed: 01/14/2023] Open
Abstract
We investigated neural representations for visual perception of 10 handwritten digits and six visual objects from a convolutional neural network (CNN) and humans using functional magnetic resonance imaging (fMRI). Once our CNN model was fine-tuned using a pre-trained VGG16 model to recognize the visual stimuli from the digit and object categories, representational similarity analysis (RSA) was conducted using neural activations from fMRI and feature representations from the CNN model across all 16 classes. The encoded neural representation of the CNN model exhibited the hierarchical topography mapping of the human visual system. The feature representations in the lower convolutional (Conv) layers showed greater similarity with the neural representations in the early visual areas and parietal cortices, including the posterior cingulate cortex. The feature representations in the higher Conv layers were encoded in the higher-order visual areas, including the ventral/medial/dorsal stream and middle temporal complex. The neural representations in the classification layers were observed mainly in the ventral stream visual cortex (including the inferior temporal cortex), superior parietal cortex, and prefrontal cortex. There was a surprising similarity between the neural representations from the CNN model and the neural representations for human visual perception in the context of the perception of digits versus objects, particularly in the primary visual and associated areas. This study also illustrates the uniqueness of human visual perception. Unlike the CNN model, the neural representation of digits and objects for humans is more widely distributed across the whole brain, including the frontal and temporal areas.
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Affiliation(s)
- Juhyeon Lee
- Department of Brain and Cognitive EngineeringKorea UniversitySeoulRepublic of Korea
| | - Minyoung Jung
- Department of Brain and Cognitive EngineeringKorea UniversitySeoulRepublic of Korea
| | - Niv Lustig
- Department of Brain and Cognitive EngineeringKorea UniversitySeoulRepublic of Korea
| | - Jong‐Hwan Lee
- Department of Brain and Cognitive EngineeringKorea UniversitySeoulRepublic of Korea
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Yang TY, Huang CH, An C, Weng LC. Construction and evaluation of a 360 degrees panoramic video on the physical examination of nursing students. Nurse Educ Pract 2022; 63:103372. [DOI: 10.1016/j.nepr.2022.103372] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2022] [Revised: 04/22/2022] [Accepted: 05/20/2022] [Indexed: 12/01/2022]
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Callahan-Flintoft C, Barentine C, Touryan J, Ries AJ. A Case for Studying Naturalistic Eye and Head Movements in Virtual Environments. Front Psychol 2022; 12:650693. [PMID: 35035362 PMCID: PMC8759101 DOI: 10.3389/fpsyg.2021.650693] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2021] [Accepted: 11/10/2021] [Indexed: 12/03/2022] Open
Abstract
Using head mounted displays (HMDs) in conjunction with virtual reality (VR), vision researchers are able to capture more naturalistic vision in an experimentally controlled setting. Namely, eye movements can be accurately tracked as they occur in concert with head movements as subjects navigate virtual environments. A benefit of this approach is that, unlike other mobile eye tracking (ET) set-ups in unconstrained settings, the experimenter has precise control over the location and timing of stimulus presentation, making it easier to compare findings between HMD studies and those that use monitor displays, which account for the bulk of previous work in eye movement research and vision sciences more generally. Here, a visual discrimination paradigm is presented as a proof of concept to demonstrate the applicability of collecting eye and head tracking data from an HMD in VR for vision research. The current work’s contribution is 3-fold: firstly, results demonstrating both the strengths and the weaknesses of recording and classifying eye and head tracking data in VR, secondly, a highly flexible graphical user interface (GUI) used to generate the current experiment, is offered to lower the software development start-up cost of future researchers transitioning to a VR space, and finally, the dataset analyzed here of behavioral, eye and head tracking data synchronized with environmental variables from a task specifically designed to elicit a variety of eye and head movements could be an asset in testing future eye movement classification algorithms.
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Affiliation(s)
- Chloe Callahan-Flintoft
- Humans in Complex System Directorate, United States Army Research Laboratory, Adelphi, MD, United States
| | - Christian Barentine
- Warfighter Effectiveness Research Center, United States Air Force Academy, Colorado Springs, CO, United States
| | - Jonathan Touryan
- Humans in Complex System Directorate, United States Army Research Laboratory, Adelphi, MD, United States
| | - Anthony J Ries
- Humans in Complex System Directorate, United States Army Research Laboratory, Adelphi, MD, United States.,Warfighter Effectiveness Research Center, United States Air Force Academy, Colorado Springs, CO, United States
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Finn ES, Glerean E, Hasson U, Vanderwal T. Naturalistic imaging: The use of ecologically valid conditions to study brain function. Neuroimage 2021; 247:118776. [PMID: 34864153 DOI: 10.1016/j.neuroimage.2021.118776] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
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Su C, Zhou H, Wang C, Geng F, Hu Y. Individualized video recommendation modulates functional connectivity between large scale networks. Hum Brain Mapp 2021; 42:5288-5299. [PMID: 34363282 PMCID: PMC8519862 DOI: 10.1002/hbm.25616] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2021] [Revised: 07/17/2021] [Accepted: 07/20/2021] [Indexed: 01/18/2023] Open
Abstract
With the emergence of AI‐powered recommender systems and their extensive use in the video streaming service, questions and concerns also arise. Why can recommended video content continuously capture users' attention? What is the impact of long‐term exposure to personalized video content on one's behaviors and brain functions? To address these questions, we designed an fMRI experiment presenting participants with personally recommended videos and generally recommended ones. To examine how large‐scale networks were modulated by personalized video content, graph theory analysis was applied to investigate the interaction between seven networks, including the ventral and dorsal attention networks (VAN, DAN), frontal–parietal network (FPN), salience network (SN), and three subnetworks of default mode network (dorsal medial prefrontal (dMPFC), Core, and medial temporal lobe (MTL)). Our results showed that viewing nonpersonalized video content mainly enhanced the connectivity in the DAN‐FPN‐Core pathway, whereas viewing personalized ones increased not only the connectivity in this pathway but also the DAN‐VAN‐dMPFC pathway. In addition, both personalized and nonpersonalized short videos decreased the couplings between SN and VAN as well as between two DMN subsystems, Core and MTL. Collectively, these findings uncovered distinct patterns of network interactions in response to short videos and provided insights into potential neural mechanisms by which human behaviors are biased by personally recommended content.
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Affiliation(s)
- Conghui Su
- Department of Psychology and Behavioral Sciences, Zhejiang University, Hangzhou, China
| | - Hui Zhou
- Department of Psychology and Behavioral Sciences, Zhejiang University, Hangzhou, China
| | - Chunjie Wang
- Institute of Brain Science and Department of Psychology, School of Education, Hangzhou Normal University, Hangzhou, China
| | - Fengji Geng
- Department of Curriculum and Learning Sciences, Zhejiang University, Hangzhou, China
| | - Yuzheng Hu
- Department of Psychology and Behavioral Sciences, Zhejiang University, Hangzhou, China
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Di Stasi LL, Diaz-Piedra C, Morales JM, Kurapov A, Tagliabue M, Bjärtå A, Megias A, Bernhardsson J, Paschenko S, Romero S, Cándido A, Catena A. A cross-cultural comparison of visual search strategies and response times in road hazard perception testing. ACCIDENT; ANALYSIS AND PREVENTION 2020; 148:105785. [PMID: 33161370 DOI: 10.1016/j.aap.2020.105785] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/11/2020] [Revised: 08/25/2020] [Accepted: 09/11/2020] [Indexed: 06/11/2023]
Abstract
Road hazard perception is considered the most prominent higher-order cognitive skill related to traffic-accident involvement. Regional cultures and social rules that govern acceptable behavior may influence drivers' interpretation of a traffic situation and, consequently, the correct identification of potentially hazardous situations. Here, we aimed to compare hazard perception skills among four European countries that differ in their traffic culture, policies to reduce traffic risks, and fatal crashes: Ukraine, Italy, Spain, and Sweden. We developed a static hazard perception test in which driving scenes with different levels of braking affordance were presented while drivers' gaze was recorded. The test required drivers to indicate the action they would undertake: to brake vs. to keep driving. We assessed 218 young adult drivers. Multilevel models revealed that the scenes' levels of braking affordance (i.e., road hazard) modulated drivers' behavior. As the levels of braking affordance increased, drivers' responses became faster and their gaze entropy decreased (i.e., visual search strategy became less erratic). The country of origin influenced these effects. Ukrainian drivers were the fastest and Swedish drivers were the slowest to respond. For all countries, the decrement in response times was less marked in the case of experienced drivers. Also, Spanish drivers showed the most structured (least erratic) visual search strategy, whereas the Italians had the most rigid (most constant) one. These results suggest that road hazard perception can be defined cross-culturally, with cultural factors (e.g., traffic climate, legislation) modulating response times and visual search strategies. Our results also support the idea that a multimodal assessment methodology is possible for mass testing of road hazard perception and its outcomes would be relevant to understand how different traffic cultures shape driving behavior.
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Affiliation(s)
- Leandro L Di Stasi
- Mind, Brain, and Behavior Research Center, University of Granada, Granada, Spain.
| | - Carolina Diaz-Piedra
- Mind, Brain, and Behavior Research Center, University of Granada, Granada, Spain; College of Nursing and Health Innovation, Arizona State University, Phoenix, AZ, USA.
| | - José M Morales
- Mind, Brain, and Behavior Research Center, University of Granada, Granada, Spain; Department of Computer Architecture and Technology, University of Granada, Granada, Spain
| | - Anton Kurapov
- Faculty of Psychology, Taras Shevchenko National University of Kyiv, Kyiv, Ukraine
| | | | - Anna Bjärtå
- Department of Psychology and Social Work, Mid Sweden University, Östersund, Sweden
| | - Alberto Megias
- Department of Basic Psychology, Faculty of Psychology, University of Malaga, Malaga, Spain
| | - Jens Bernhardsson
- Department of Psychology and Social Work, Mid Sweden University, Östersund, Sweden
| | - Svitlana Paschenko
- Faculty of Psychology, Taras Shevchenko National University of Kyiv, Kyiv, Ukraine
| | - Samuel Romero
- Department of Computer Architecture and Technology, University of Granada, Granada, Spain
| | - Antonio Cándido
- Mind, Brain, and Behavior Research Center, University of Granada, Granada, Spain
| | - Andrés Catena
- Mind, Brain, and Behavior Research Center, University of Granada, Granada, Spain
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