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Chardon M, Barbieri FA, Petit P, Vuillerme N. Reliability of Obstacle-Crossing Parameters during Overground Walking in Young Adults. SENSORS (BASEL, SWITZERLAND) 2024; 24:3387. [PMID: 38894176 PMCID: PMC11174552 DOI: 10.3390/s24113387] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/04/2024] [Revised: 05/22/2024] [Accepted: 05/22/2024] [Indexed: 06/21/2024]
Abstract
We aimed to evaluate the intra-session relative and absolute reliability of obstacle-crossing parameters during overground walking in young adults, and to determine the number of trials required to ensure reliable assessment. We analysed data from 43 young male adults who were instructed to walk at a self-selected velocity on a pathway and to step over an obstacle (height = 15 cm; width = 80 cm, thickness = 2 cm) three times. Spatial-temporal gait parameters of the approaching and crossing phases (i.e., before and after the obstacle) and obstacle clearance parameters (i.e., vertical and horizontal distance between the foot and the obstacle during crossing) were computed using a three-dimensional motion analysis system. Intraclass correlation coefficients were used to compute the relative reliability, while standard error of measurement and minimal detectable change were used to assess the absolute reliability for all possible combinations between trials. Results showed that most spatial-temporal gait parameters and obstacle clearance parameters are reliable using the average of three trials. However, the mean of the second and third trials ensures the best relative and absolute reliabilities of most obstacle-crossing parameters. Further works are needed to generalize these results in more realistic conditions and in other populations.
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Affiliation(s)
- Matthias Chardon
- AGEIS (Autonomie, Gérontologie, E-Santé, Imagerie et Société), Université Grenoble Alpes, 38000 Grenoble, France; (M.C.); (P.P.)
- Human Movement Research Laboratory (MOVI-LAB), Department of Physical Education, Sao Paulo State University (UNESP), Bauru 17033-360, SP, Brazil
| | - Fabio Augusto Barbieri
- Human Movement Research Laboratory (MOVI-LAB), Department of Physical Education, Sao Paulo State University (UNESP), Bauru 17033-360, SP, Brazil
| | - Pascal Petit
- AGEIS (Autonomie, Gérontologie, E-Santé, Imagerie et Société), Université Grenoble Alpes, 38000 Grenoble, France; (M.C.); (P.P.)
| | - Nicolas Vuillerme
- AGEIS (Autonomie, Gérontologie, E-Santé, Imagerie et Société), Université Grenoble Alpes, 38000 Grenoble, France; (M.C.); (P.P.)
- Institut Universitaire de France, 75005 Paris, France
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Pieruccini-Faria F, Hassan Haddad SM, Bray NW, Sarquis-Adamson Y, Bartha R, Montero-Odasso M. Brain Structural Correlates of Obstacle Negotiation in Mild Cognitive Impairment: Results from the Gait and Brain Study. Gerontology 2023; 69:1115-1127. [PMID: 37166343 DOI: 10.1159/000530796] [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: 07/05/2022] [Accepted: 04/17/2023] [Indexed: 05/12/2023] Open
Abstract
INTRODUCTION Mild cognitive impairment (MCI) affects obstacle negotiation capabilities, potentially increasing the risk of falls in older adults. However, it is unclear whether smaller brain volumes typically observed in older individuals with MCI are related to the observed hazardous obstacle negotiation in this population. METHODS A total of 93 participants (71.9 ± 5.36 years of age; MCI = 53/control = 40) from the Gait and Brain Study were analyzed. Gray matter (GM) volumes from the frontal, temporal, and parietal lobes were entered in the analysis. Gait performance was recorded using a 6-m electronic walkway during two cognitive load conditions while approaching and stepping over an obstacle: (1) single-task and (2) while counting backwards by 1s from 100 (dual-task). Anticipatory adjustments in gait performance to cross an "ad hoc" obstacle were electronically measured during pre-crossing phases: early (3 steps before the late phase) and late (3 steps before obstacle). Association between the percentage of change in average gait speed and step length from early to late (i.e., anticipatory adjustments) and GM volumes was investigated using multivariate models adjusted for potential confounders. RESULTS Anticipatory adjustments in gait speed (Wilks' lambda: 0.35; Eta2: 0.64; p = 0.01) and step length (Wilks' lambda: 0.33; Eta2: 0.66; p = 0.01) during dual-task conditions were globally associated with GM volumes in MCI. Individuals with MCI with smaller GM volumes in the left inferior frontal gyrus, left hippocampus, right hippocampus, and right entorhinal cortex made significantly fewer anticipatory gait adjustments prior to crossing the obstacle. CONCLUSION Frontotemporal atrophy may affect obstacle negotiation capabilities potentially increasing the risk of falls in MCI.
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Affiliation(s)
- Frederico Pieruccini-Faria
- Division of Geriatric Medicine, Department of Medicine, Western University, London, Ontario, Canada
- Gait and Brain Lab, Parkwood Institute and Lawson Health Research Institute, London, Ontario, Canada
| | | | - Nickolas W Bray
- Gait and Brain Lab, Parkwood Institute and Lawson Health Research Institute, London, Ontario, Canada
- Department of Physiology and Pharmacology, Cumming School of Medicine, University of Calgary, Calgary, Alberta, Canada
| | - Yanina Sarquis-Adamson
- Gait and Brain Lab, Parkwood Institute and Lawson Health Research Institute, London, Ontario, Canada
| | - Robert Bartha
- Robarts Research Institute, Schulich School of Medicine & Dentistry, Western University, London, Ontario, Canada
- Department of Medical Biophysics, Schulich School of Medicine and Dentistry, Western University, London, Ontario, Canada
| | - Manuel Montero-Odasso
- Division of Geriatric Medicine, Department of Medicine, Western University, London, Ontario, Canada
- Gait and Brain Lab, Parkwood Institute and Lawson Health Research Institute, London, Ontario, Canada
- Department of Epidemiology and Biostatistics, Western University, London, Ontario, Canada
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Chardon M, Barbieri FA, Penedo T, Santos PCR, Vuillerme N. The effects of experimentally-induced fatigue on gait parameters during obstacle crossing: A systematic review. Neurosci Biobehav Rev 2022; 142:104854. [PMID: 36084846 DOI: 10.1016/j.neubiorev.2022.104854] [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: 03/04/2022] [Revised: 08/12/2022] [Accepted: 08/30/2022] [Indexed: 10/31/2022]
Abstract
Striking an obstacle while walking can be dangerous, reflecting the higher risks of losing one's balance, tripping and falling. Particular situations during which internal resources are limited, such as in a fatigued state, may impair performance when crossing obstacles, enhancing the risks of falls or accidents. Our goal was thus to review the effects of experimentally-induced fatigue (EIF) on gait parameters during obstacle crossing by healthy individuals. We systematically searched PubMed and Web of Science databases using 'fatigue', 'obstacle crossing' and their equivalent terms to extract data from studies investigating this domain. Nine studies were found. First, EIF-related effects on kinetics, EMG and obstacle contacts have been poorly studied. Second, consistent and inconsistent results were found in the kinematic outcomes after EIF. Consistent results included reductions in stride duration and increased step width. Inconsistent results included gait velocity (no-effect vs increased), leading and trailing-foot vertical clearance (reduced vs increased) and horizontal distance from foot to the obstacle before obstacle avoidance (no-effect vs increased). These findings should be interpreted cautiously, however, due to the heterogeneity of the obstacle crossing and EIF protocols.
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Affiliation(s)
- M Chardon
- AGEIS, Université Grenoble Alpes, Grenoble, France; Human Movement Research Laboratory (MOVI-LAB), Department of Physical Education, School of Sciences, São Paulo State University (UNESP), Bauru, Brazil
| | - F A Barbieri
- Human Movement Research Laboratory (MOVI-LAB), Department of Physical Education, School of Sciences, São Paulo State University (UNESP), Bauru, Brazil.
| | - T Penedo
- AGEIS, Université Grenoble Alpes, Grenoble, France; Human Movement Research Laboratory (MOVI-LAB), Department of Physical Education, School of Sciences, São Paulo State University (UNESP), Bauru, Brazil
| | - Paulo C R Santos
- Department of Computer Science and Applied Mathematics, Weizmann Institute of Science, Rehovot, Israel
| | - N Vuillerme
- AGEIS, Université Grenoble Alpes, Grenoble, France; Institut Universitaire de France, Paris, France.
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Lappi O. Egocentric Chunking in the Predictive Brain: A Cognitive Basis of Expert Performance in High-Speed Sports. Front Hum Neurosci 2022; 16:822887. [PMID: 35496065 PMCID: PMC9039003 DOI: 10.3389/fnhum.2022.822887] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2021] [Accepted: 03/16/2022] [Indexed: 11/13/2022] Open
Abstract
What principles and mechanisms allow humans to encode complex 3D information, and how can it be so fast, so accurately and so flexibly transformed into coordinated action? How do these processes work when developed to the limit of human physiological and cognitive capacity-as they are in high-speed sports, such as alpine skiing or motor racing? High-speed sports present not only physical challenges, but present some of the biggest perceptual-cognitive demands for the brain. The skill of these elite athletes is in many ways an attractive model for studying human performance "in the wild", and its neurocognitive basis. This article presents a framework theory for how these abilities may be realized in high-speed sports. It draws on a careful analysis of the case of the motorsport athlete, as well as theoretical concepts from: (1) cognitive neuroscience of wayfinding, steering, and driving; (2) cognitive psychology of expertise; (3) cognitive modeling and machine learning; (4) human-in-the loop modellling in vehicle system dynamics and human performance engineering; (5) experimental research (in the laboratory and in the field) on human visual guidance. The distinctive contribution is the way these are integrated, and the concept of chunking is used in a novel way to analyze a high-speed sport. The mechanisms invoked are domain-general, and not specific to motorsport or the use of a particular type of vehicle (or any vehicle for that matter); the egocentric chunking hypothesis should therefore apply to any dynamic task that requires similar core skills. It offers a framework for neuroscientists, psychologists, engineers, and computer scientists working in the field of expert sports performance, and may be useful in translating fundamental research into theory-based insight and recommendations for improving real-world elite performance. Specific experimental predictions and applicability of the hypotheses to other sports are discussed.
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Affiliation(s)
- Otto Lappi
- Cognitive Science/Traffic Research Unit (TRU)/TRUlab, University of Helsinki, Helsinki, Finland
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Di Marco S, Fattori P, Galati G, Galletti C, Lappe M, Maltempo T, Serra C, Sulpizio V, Pitzalis S. Preference for locomotion-compatible curved paths and forward direction of self-motion in somatomotor and visual areas. Cortex 2021; 137:74-92. [PMID: 33607346 DOI: 10.1016/j.cortex.2020.12.021] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2020] [Revised: 11/20/2020] [Accepted: 12/05/2020] [Indexed: 12/11/2022]
Abstract
During locomotion, leg movements define the direction of walking (forward or backward) and the path one is taking (straight or curved). These aspects of locomotion produce characteristic visual motion patterns during movement. Here, we tested whether cortical regions responding to either egomotion-compatible visual motion, or leg movements, or both, are sensitive to these locomotion-relevant aspects of visual motion. We compared a curved path (typically the visual feedback of a changing direction of movement in the environment) to a linear path for simulated forward and backward motion in an event-related fMRI experiment. We used an individual surface-based approach and two functional localizers to define (1) six egomotion-related areas (V6+, V3A, intraparietal motion area [IPSmot], cingulate sulcus visual area [CSv], posterior cingulate area [pCi], posterior insular cortex [PIC]) using the flow field stimulus and (2) three leg-related cortical regions (human PEc [hPEc], human PE [hPE] and primary somatosensory cortex [S-I]) using a somatomotor task. Then, we extracted the response from all these regions with respect to the main event-related fMRI experiment, consisting of passive viewing of an optic flow stimulus, simulating a forward or backward direction of self-motion in either linear or curved path. Results showed that some regions have a significant preference for the curved path motion (hPEc, hPE, S-I, IPSmot) or a preference for the forward motion (V3A), while other regions have both a significant preference for the curved path motion and for the forward compared to backward motion (V6+, CSv, pCi). We did not find any significant effects of the present stimuli in PIC. Since controlling locomotion mainly means controlling changes of walking direction in the environment during forward self-motion, such a differential functional profile among these cortical regions suggests that they play a differentiated role in the visual guidance of locomotion.
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Affiliation(s)
- Sara Di Marco
- Department of Movement, Human and Health Sciences, University of Rome ''Foro Italico'', Rome, Italy; Department of Cognitive and Motor Rehabilitation and Neuroimaging, Santa Lucia Foundation (IRCCS Fondazione Santa Lucia), Rome, Italy.
| | - Patrizia Fattori
- Department of Biomedical and Neuromotor Sciences, University of Bologna, Bologna, Italy
| | - Gaspare Galati
- Department of Cognitive and Motor Rehabilitation and Neuroimaging, Santa Lucia Foundation (IRCCS Fondazione Santa Lucia), Rome, Italy; Brain Imaging Laboratory, Department of Psychology, Sapienza University, Rome, Italy
| | - Claudio Galletti
- Department of Biomedical and Neuromotor Sciences, University of Bologna, Bologna, Italy
| | - Markus Lappe
- Institute for Psychology, University of Muenster, Muenster, Germany; Otto Creutzfeldt Center for Cognitive and Behavioral Neuroscience, University of Muenster, Muenster, Germany
| | - Teresa Maltempo
- Department of Movement, Human and Health Sciences, University of Rome ''Foro Italico'', Rome, Italy; Department of Cognitive and Motor Rehabilitation and Neuroimaging, Santa Lucia Foundation (IRCCS Fondazione Santa Lucia), Rome, Italy
| | - Chiara Serra
- Department of Movement, Human and Health Sciences, University of Rome ''Foro Italico'', Rome, Italy; Department of Cognitive and Motor Rehabilitation and Neuroimaging, Santa Lucia Foundation (IRCCS Fondazione Santa Lucia), Rome, Italy
| | - Valentina Sulpizio
- Department of Cognitive and Motor Rehabilitation and Neuroimaging, Santa Lucia Foundation (IRCCS Fondazione Santa Lucia), Rome, Italy; Department of Biomedical and Neuromotor Sciences, University of Bologna, Bologna, Italy
| | - Sabrina Pitzalis
- Department of Movement, Human and Health Sciences, University of Rome ''Foro Italico'', Rome, Italy; Department of Cognitive and Motor Rehabilitation and Neuroimaging, Santa Lucia Foundation (IRCCS Fondazione Santa Lucia), Rome, Italy
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Darekar A, Goussev V, McFadyen BJ, Lamontagne A, Fung J. Modeling spatial navigation in the presence of dynamic obstacles: a differential games approach. J Neurophysiol 2017; 119:990-1004. [PMID: 29187558 DOI: 10.1152/jn.00857.2016] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Obstacle circumvention strategies can be shaped by the dynamic interaction of an individual (evader) and an obstacle (pursuer). We have developed a mathematical model with predictive and emergent components, using experimental data from seven healthy young adults walking toward a target while avoiding collision with a stationary or moving obstacle (approaching head-on, or diagonally 30° left or right) in a virtual environment. Two linear properties from the predictive component enable the evader to predict the minimum distance between itself and the obstacle at all times, including the future intersection of trajectories. The emergent component uses the classical differential games model to solve for an optimal circumvention while reaching the target, wherein the locomotor strategy is influenced by the obstacle, target, and the evader velocity. Both model components were fitted to a different set of experimental data obtained from five poststroke and healthy participants to derive the minimum predicted distance (predictive component) and obstacle influence dimensions (emergent component) during circumvention. Minimum predicted distance between evader and pursuer was kept constant when the evader was closest to the obstacle in all participants. Obstacle influence dimensions varied depending on obstacle approach condition and preferred side of circumvention, reflecting differences in locomotor strategies between poststroke and healthy individuals. Additionally, important associations between model outputs and observed experimental outcomes were found. The model, supported by experimental data, suggests that both predictive and emergent processes can shape obstacle circumvention strategies in healthy and poststroke individuals. NEW & NOTEWORTHY Obstacle circumvention during goal-directed locomotion is modeled with a new mathematical approach comprising both predictive and emergent elements. The major novelty is using differential games solutions to illustrate the dynamic interactions between the individual as an evader and the approaching obstacle as a pursuer. The model is supported by experimental evidence that explains the behavior along the continuum of locomotor adaptation displayed by healthy subjects and individuals with stroke.
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Affiliation(s)
- Anuja Darekar
- School of Physical and Occupational Therapy, Faculty of Medicine, McGill University , Montreal, Quebec , Canada.,Feil and Oberfeld Research Center, Jewish Rehabilitation Hospital site of the Centre Intégré de Santé et Services Sociaux de Laval, Research Site of the Montreal Centre for Interdisciplinary Research in Rehabilitation , Laval, Quebec , Canada
| | - Valery Goussev
- Feil and Oberfeld Research Center, Jewish Rehabilitation Hospital site of the Centre Intégré de Santé et Services Sociaux de Laval, Research Site of the Montreal Centre for Interdisciplinary Research in Rehabilitation , Laval, Quebec , Canada
| | - Bradford J McFadyen
- Centre for Interdisciplinary Research in Rehabilitation and Social Integration at the Quebec Rehabilitation Institute , Montreal, Quebec , Canada.,Department of Rehabilitation, Faculty of Medicine, Laval University , Laval, Quebec , Canada
| | - Anouk Lamontagne
- School of Physical and Occupational Therapy, Faculty of Medicine, McGill University , Montreal, Quebec , Canada.,Feil and Oberfeld Research Center, Jewish Rehabilitation Hospital site of the Centre Intégré de Santé et Services Sociaux de Laval, Research Site of the Montreal Centre for Interdisciplinary Research in Rehabilitation , Laval, Quebec , Canada
| | - Joyce Fung
- School of Physical and Occupational Therapy, Faculty of Medicine, McGill University , Montreal, Quebec , Canada.,Feil and Oberfeld Research Center, Jewish Rehabilitation Hospital site of the Centre Intégré de Santé et Services Sociaux de Laval, Research Site of the Montreal Centre for Interdisciplinary Research in Rehabilitation , Laval, Quebec , Canada
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Kirollos R, Allison RS, Palmisano S. Cortical Correlates of the Simulated Viewpoint Oscillation Advantage for Vection. Multisens Res 2017. [DOI: 10.1163/22134808-00002593] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Behavioural studies have consistently found stronger vection responses for oscillating, compared to smooth/constant, patterns of radial flow (the simulated viewpoint oscillation advantage for vection). Traditional accounts predict that simulated viewpoint oscillation should impair vection by increasing visual–vestibular conflicts in stationary observers (as this visual oscillation simulates self-accelerations that should strongly stimulate the vestibular apparatus). However, support for increased vestibular activity during accelerating vection has been mixed in the brain imaging literature. This fMRI study examined BOLD activity in visual (cingulate sulcus visual area — CSv; medial temporal complex — MT+; V6; precuneus motion area — PcM) and vestibular regions (parieto-insular vestibular cortex — PIVC/posterior insular cortex — PIC; ventral intraparietal region — VIP) when stationary observers were exposed to vection-inducing optic flow (i.e., globally coherent oscillating and smooth self-motion displays) as well as two suitable control displays. In line with earlier studies in which no vection occurred, CSv and PIVC/PIC both showed significantly increased BOLD activity during oscillating global motion compared to the other motion conditions (although this effect was found for fewer subjects in PIVC/PIC). The increase in BOLD activity in PIVC/PIC during prolonged exposure to the oscillating (compared to smooth) patterns of global optical flow appears consistent with vestibular facilitation.
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Affiliation(s)
- Ramy Kirollos
- Centre for Vision Research, York University, Toronto, ON, M3J 1P3, Canada
| | - Robert S. Allison
- Centre for Vision Research, York University, Toronto, ON, M3J 1P3, Canada
| | - Stephen Palmisano
- Centre for Psychophysics, Psychophysiology, and Psychopharmacology
- School of Psychology, University of Wollongong, Wollongong, NSW, 2522, Australia
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8
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Beyeler M, Oros N, Dutt N, Krichmar JL. A GPU-accelerated cortical neural network model for visually guided robot navigation. Neural Netw 2015; 72:75-87. [PMID: 26494281 DOI: 10.1016/j.neunet.2015.09.005] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2015] [Revised: 07/17/2015] [Accepted: 09/22/2015] [Indexed: 11/27/2022]
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Nakashima R, Iwai R, Ueda S, Kumada T. Egocentric Direction and Position Perceptions are Dissociable Based on Only Static Lane Edge Information. Front Psychol 2015; 6:1837. [PMID: 26648895 PMCID: PMC4663249 DOI: 10.3389/fpsyg.2015.01837] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2015] [Accepted: 11/13/2015] [Indexed: 11/24/2022] Open
Abstract
When observers perceive several objects in a space, at the same time, they should effectively perceive their own position as a viewpoint. However, little is known about observers' percepts of their own spatial location based on the visual scene information viewed from them. Previous studies indicate that two distinct visual spatial processes exist in the locomotion situation: the egocentric position perception and egocentric direction perception. Those studies examined such perceptions in information rich visual environments where much dynamic and static visual information was available. This study examined these two perceptions in information of impoverished environments, including only static lane edge information (i.e., limited information). We investigated the visual factors associated with static lane edge information that may affect these perceptions. Especially, we examined the effects of the two factors on egocentric direction and position perceptions. One is the "uprightness factor" that "far" visual information is seen at upper location than "near" visual information. The other is the "central vision factor" that observers usually look at "far" visual information using central vision (i.e., foveal vision) whereas 'near' visual information using peripheral vision. Experiment 1 examined the effect of the "uprightness factor" using normal and inverted road images. Experiment 2 examined the effect of the "central vision factor" using normal and transposed road images where the upper half of the normal image was presented under the lower half. Experiment 3 aimed to replicate the results of Experiments 1 and 2. Results showed that egocentric direction perception is interfered with image inversion or image transposition, whereas egocentric position perception is robust against these image transformations. That is, both "uprightness" and "central vision" factors are important for egocentric direction perception, but not for egocentric position perception. Therefore, the two visual spatial perceptions about observers' own viewpoints are fundamentally dissociable.
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Affiliation(s)
- Ryoichi Nakashima
- RIKEN Brain Science Institute-TOYOTA Collaboration Center, RIKENWako, Japan
| | - Ritsuko Iwai
- RIKEN Brain Science Institute-TOYOTA Collaboration Center, RIKENWako, Japan
| | - Sayako Ueda
- RIKEN Brain Science Institute-TOYOTA Collaboration Center, RIKENWako, Japan
| | - Takatsune Kumada
- RIKEN Brain Science Institute-TOYOTA Collaboration Center, RIKENWako, Japan
- Graduate School of Informatics, Kyoto UniversityKyoto, Japan
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Taking the next step: cortical contributions to the control of locomotion. Curr Opin Neurobiol 2015; 33:25-33. [DOI: 10.1016/j.conb.2015.01.011] [Citation(s) in RCA: 130] [Impact Index Per Article: 14.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2014] [Revised: 01/11/2015] [Accepted: 01/13/2015] [Indexed: 11/20/2022]
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11
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Neural substrates underlying the passive observation and active control of translational egomotion. J Neurosci 2015; 35:4258-67. [PMID: 25762672 DOI: 10.1523/jneurosci.2647-14.2015] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Moving or static obstacles often get in the way while walking in daily life. Avoiding obstacles involves both perceptual processing of motion information and controlling appropriate defensive movements. Several higher-level motion areas, including the ventral intraparietal area (VIP), medial superior temporal area, parieto-insular vestibular cortex (PIVC), areas V6 and V6A, and cingulate sulcus visual area, have been identified in humans by passive viewing of optic flow patterns that simulate egomotion and object motion. However, the roles of these areas in the active control of egomotion in the real world remain unclear. Here, we used functional magnetic resonance imaging (fMRI) to map the neural substrates underlying the passive observation and active control of translational egomotion in humans. A wide-field virtual reality environment simulated a daily scenario where doors randomly swing outward while walking in a hallway. The stimuli of door-dodging events were essentially the same in two event-related fMRI experiments, which compared passive and active dodges in response to swinging doors. Passive dodges were controlled by a computer program, while active dodges were controlled by the subject. Passive dodges activated several higher-level areas distributed across three dorsal motion streams in the temporal, parietal, and cingulate cortex. Active dodges most strongly activated the temporal-vestibular stream, with peak activation located in the right PIVC. Other higher-level motion areas including VIP showed weaker to no activation in active dodges. These results suggest that PIVC plays an active role in sensing and guiding translational egomotion that moves an observer aside from impending obstacles.
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Frissen I, Mars F. The Effect of Visual Degradation on Anticipatory and Compensatory Steering Control. Q J Exp Psychol (Hove) 2014; 67:499-507. [DOI: 10.1080/17470218.2013.819518] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
It has long been held that steering a vehicle is subserved by two distinct visual processes, a compensatory one for maintaining lane position and an anticipatory one for previewing the curvature of the upcoming road. In this study, we investigated the robustness of these two steering control processes by systematically degrading their visual inputs. Performance was measured at the level of vehicle position and at the level of the actions on the steering wheel. The results show that the compensatory process is more robust to visual degradation than the anticipatory process. The results are also consistent with the idea that steering is under the supervision of a combination of compensatory and anticipatory mechanisms, although they suggest that the quality of the sensory information will determine how information is combined.
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Affiliation(s)
- Ilja Frissen
- IRCCyN (Institut de Recherche en Communications et Cybernétique de Nantes), CNRS, Ecole Centrale de Nantes, LUNAM Université, Nantes, France
| | - Franck Mars
- IRCCyN (Institut de Recherche en Communications et Cybernétique de Nantes), CNRS, Ecole Centrale de Nantes, LUNAM Université, Nantes, France
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