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Ardonceau V, Poulin-Charronnat B, Bonnet C, Sirandré C, Michel-Colent C. Vertical prism adaptation, but not sound presentation, modulates the visuospatial representation: A manual line-bisection study. Cortex 2024; 177:330-345. [PMID: 38908363 DOI: 10.1016/j.cortex.2024.05.014] [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: 09/12/2023] [Revised: 04/04/2024] [Accepted: 05/21/2024] [Indexed: 06/24/2024]
Abstract
The present study aimed at testing whether vertical prism adaptation (PA) can modulate vertical visuospatial representation, assessed with a vertical manual line-bisection (MLB) task (Experiment 1). In a second time, we wanted to investigate the potential influence of sound presentation during such a task. Sound is a spatially valued element that has previously been reported to modify horizontal visuospatial representation. In Experiment 2, we presented either a high pitch, a low pitch, or no sound during the same MLB as in Experiment 1. With this experiment, we also searched for an eventual interaction between the effect of sound presentation and the potential cognitive aftereffects of vertical PA on visual representation. Both Experiments 1 and 2 were constructed with the same design and conducted with two distinct groups of young healthy right-handed participants. First, we assessed the initial sensorimotor state with an open-loop pointing task, and the initial representational state through a vertical MLB (with addition of sound for Experiment 2). Then participants were submitted to a 16-minute PA procedure and were tested again on the open-loop pointing task and the MLB to assess the aftereffects following prism removal. Our results showed sensorimotor aftereffects following both upward and downward PA, in a direction opposed to the optical deviation used. The early aftereffects measured following PA were symmetrical, but at the end of the experiment the residual aftereffects were smaller following downward PA than upward PA. We also provide a new insight on the aftereffects of vertical PA on visuospatial representation, showing that downward PA (but not upward PA) can produce an upward bias on the manual line-bisection task. This is the first proof of such cognitive aftereffects following vertical PA. However, we found no effect of sound presentation on the vertical visual space representation and no interaction between PA and sound presentation.
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Affiliation(s)
- Vincent Ardonceau
- Inserm U1093 - CAPS, Université de Bourgogne, UFR des Sciences du Sport, Dijon, France.
| | | | | | - Cyril Sirandré
- Inserm U1093 - CAPS, Université de Bourgogne, UFR des Sciences du Sport, Dijon, France
| | - Carine Michel-Colent
- Inserm U1093 - CAPS, Université de Bourgogne, UFR des Sciences du Sport, Dijon, France
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Swainson A, Woodward KM, Boca M, Rolinski M, Collard P, Cerminara NL, Apps R, Whone AL, Gilchrist ID. Slower rates of prism adaptation but intact aftereffects in patients with early to mid-stage Parkinson's disease. Neuropsychologia 2023; 189:108681. [PMID: 37709193 DOI: 10.1016/j.neuropsychologia.2023.108681] [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: 05/05/2023] [Revised: 09/08/2023] [Accepted: 09/11/2023] [Indexed: 09/16/2023]
Abstract
There is currently mixed evidence on the effect of Parkinson's disease on motor adaptation. Some studies report that patients display adaptation comparable to age-matched controls, while others report a complete inability to adapt to novel sensory perturbations. Here, early to mid-stage Parkinson's patients were recruited to perform a prism adaptation task. When compared to controls, patients showed slower rates of initial adaptation but intact aftereffects. These results support the suggestion that patients with early to mid-stage Parkinson's disease display intact adaptation driven by sensory prediction errors, as shown by the intact aftereffect. But impaired facilitation of performance through cognitive strategies informed by task error, as shown by the impaired initial adaptation. These results support recent studies that suggest that patients with Parkinson's disease retain the ability to perform visuomotor adaptation, but display altered use of cognitive strategies to aid performance and generalises these previous findings to the classical prism adaptation task.
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Affiliation(s)
- Alex Swainson
- University of Bristol, School of Physiology, Pharmacology and Neuroscience, Bristol, BS8 1TD, United Kingdom.
| | - Kathryn M Woodward
- Bristol Medical School, University of Bristol, Bristol, BS8 1UD, United Kingdom
| | - Mihaela Boca
- Bristol Brain Centre, Southmead Hospital, Bristol, BS10 5FN, United Kingdom
| | - Michal Rolinski
- Bristol Brain Centre, Southmead Hospital, Bristol, BS10 5FN, United Kingdom
| | - Philip Collard
- University of Bristol, School of Psychological Science, Bristol, BS8 1TU, United Kingdom
| | - Nadia L Cerminara
- University of Bristol, School of Physiology, Pharmacology and Neuroscience, Bristol, BS8 1TD, United Kingdom
| | - Richard Apps
- University of Bristol, School of Physiology, Pharmacology and Neuroscience, Bristol, BS8 1TD, United Kingdom
| | - Alan L Whone
- Bristol Brain Centre, Southmead Hospital, Bristol, BS10 5FN, United Kingdom
| | - Iain D Gilchrist
- University of Bristol, School of Psychological Science, Bristol, BS8 1TU, United Kingdom
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Bonnet C, Poulin-Charronnat B, Ardonceau V, Sirandré C, Bard P, Michel C. Visuomanual Vertical Prism Adaptation: Aftereffects on Visuospatial and Auditory Frequency Representations. Front Psychol 2022; 13:850495. [PMID: 35558701 PMCID: PMC9087268 DOI: 10.3389/fpsyg.2022.850495] [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: 01/07/2022] [Accepted: 03/15/2022] [Indexed: 11/23/2022] Open
Abstract
Sensorimotor aftereffects have been widely studied after lateral prism adaptation but not after vertical prism adaptation. It is thus well-known that lateral prism adaptation produces aftereffects on visuospatial representation and, recently, on auditory perception. This study aimed to explore the sensorimotor after-effects of vertical prism adaptation as well as its aftereffects on vertical visuospatial representation (Experiment 1) and on auditory frequency representation (Experiment 2). The experimental procedure was similar in both experiments: before and after prism adaptation to an upward or a downward optical deviation, healthy young participants performed an visual open-loop pointing task and a visual (Experiment 1) or an auditory (Experiment 2) perceptual bisection task. In the visual task, the participants had to indicate if they perceived the bisection as higher or lower than the true center of a line. In the auditory task, the participants had to indicate if they perceived the target auditory frequency closer to the low or the high limit of an auditory interval. For sensorimotor aftereffects, pointing errors were computed by means of a vertical touchscreen. For the perceptual bisection task, we measured the percentage of “down” (Experiment 1) or “low” responses (Experiment 2), and we computed the visual (Experiment 1) or the auditory (Experiment 2) subjective center for each participant. Statistical analyses were carried out separately for each optical deviation in each experiment. Sensorimotor aftereffects were observed in both experiments, in the opposite direction to the optical deviation (all ps < 0.01). No significant aftereffects occurred on visuospatial representation (all ps > 0.5), whereas the percentage of “low” responses and the auditory subjective center significantly increased after adaptation to a downward optical deviation (all ps < 0.05). Unlike lateral prism adaptation aftereffects that have been previously shown in both visuospatial horizontal representation and auditory frequency representation, aftereffects of vertical prism adaptation occurred in the auditory frequency representation but not in the vertical visuospatial representation. These results suggest that both vertical and lateral prism adaptations share a common substrate dedicated to the auditory modality (probably the temporal cortex), and that vertical adaptation does not act on the neural substrate of vertical visuospatial representation.
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Affiliation(s)
- Clémence Bonnet
- INSERM UMR 1093-CAPS, Université Bourgogne Franche-Comté, UFR des Sciences du Sport, Dijon, France
| | | | - Vincent Ardonceau
- INSERM UMR 1093-CAPS, Université Bourgogne Franche-Comté, UFR des Sciences du Sport, Dijon, France
| | - Cyril Sirandré
- INSERM UMR 1093-CAPS, Université Bourgogne Franche-Comté, UFR des Sciences du Sport, Dijon, France
| | - Patrick Bard
- LEAD, CNRS UMR 5022, Université Bourgogne Franche-Comté, Dijon, France
| | - Carine Michel
- INSERM UMR 1093-CAPS, Université Bourgogne Franche-Comté, UFR des Sciences du Sport, Dijon, France
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Two weeks of twice-daily prism adaptation treatment does not improve posture or gait in Parkinson's disease: a double-blind randomized controlled trial. Trials 2021; 22:846. [PMID: 34823572 PMCID: PMC8620921 DOI: 10.1186/s13063-021-05832-2] [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: 11/12/2020] [Accepted: 11/15/2021] [Indexed: 11/10/2022] Open
Abstract
Background Gait difficulties in Parkinson’s disease have been related to problems shifting the center of gravity forward. We previously showed reduced forward stepping latencies for people with Parkinson’s disease after one session of adaptation to upward visual shifts, which produces downward motor after-effects and potentially shifts the center of gravity forward. Here we tested if repeated prism adaptation improved gait and postural control in Parkinson’s disease through a parallel, double-blind, randomized, sham-controlled trial. Methods We recruited participants with idiopathic Parkinson’s disease aged 40–85 and meeting any one of three clinical criteria: (1) Hoehn and Yahr Stage II.5–IV; (2) scoring > 0 on the gait, freezing of gait, and/or postural stability items of the Movement Disorder Society Unified Parkinson’s Disease Rating Scale; or (3) Timed Up and Go > 12 s. Sealed envelope style randomization allocated participants to two weeks of twice-daily prism adaptation or sham treatment. Participants, care givers, and those assessing the outcomes were blinded to group assignment. Primary outcomes were changes in postural control measured using the Berg Balance Scale and the Limits of Stability, Sensory Organization, and Motor Control tests from the Smart EquiTest system. Secondary outcomes included other physiotherapy and questionnaire measures. Outcomes were assessed at the Dartmouth Hitchcock Medical Center immediately before and after the treatment period, with further long-term postal follow-up over 3 months. Outcomes were analyzed using analyses of variance with follow-up t tests. Results Eighteen participants were allocated to undergo prism adaptation, of which sixteen were analyzed. Thirteen participants were allocated to undergo sham treatment, and all were analyzed. The prism adaptation group showed increased forward stepping velocity on the Limits of Stability test (pre: M=2.33, SEM=0.24; post: M=2.88, SEM=0.26; t(15)=3.2, p=.005, d=.819). The sham group showed no such change (pre: M=2.13, SEM=0.22; 1d post: M=2.24, SEM=0.22; t(13)=.636, p=.537, d=.176). However, there were no group differences for any other outcome measures and no indications that prism adaptation produced functional improvements in posture, gait, or activities of daily living. Conclusions Prism adaptation does not improve gait or postural control in Parkinson’s disease. Trial registration ClinicalTrials.govNCT02380859. Registered prospectively on 5 March 2015. Supplementary Information The online version contains supplementary material available at 10.1186/s13063-021-05832-2.
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Halicka M, Vittersø AD, McCullough H, Goebel A, Heelas L, Proulx MJ, Bultitude JH. Prism adaptation treatment for upper-limb complex regional pain syndrome: a double-blind randomized controlled trial. Pain 2021; 162:471-489. [PMID: 32833791 PMCID: PMC7808368 DOI: 10.1097/j.pain.0000000000002053] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2020] [Revised: 07/14/2020] [Accepted: 08/03/2020] [Indexed: 12/17/2022]
Abstract
ABSTRACT Initial evidence suggested that people with complex regional pain syndrome (CRPS) have reduced attention to the affected side of their body and the surrounding space, which might be related to pain and other clinical symptoms. Three previous unblinded, uncontrolled studies showed pain relief after treatment with prism adaptation, an intervention that has been used to counter lateralised attention bias in brain-lesioned patients. To provide a robust test of its effectiveness for CRPS, we conducted a double-blind randomized controlled trial of prism adaptation for unilateral upper-limb CRPS-I. Forty-nine eligible adults with CRPS were randomized to undergo 2 weeks of twice-daily home-based prism adaptation treatment (n = 23) or sham treatment (n = 26). Outcomes were assessed in person 4 weeks before and immediately before treatment, and immediately after and 4 weeks after treatment. Long-term postal follow-ups were conducted 3 and 6 months after treatment. We examined the effects of prism adaptation vs sham treatment on current pain intensity and the CRPS symptom severity score (primary outcomes), as well as sensory, motor, and autonomic functions, self-reported psychological functioning, and experimentally tested neuropsychological functions (secondary outcomes). We found no evidence that primary or secondary outcomes differed between the prism adaptation and sham treatment groups when tested at either time point after treatment. Overall, CRPS severity significantly decreased over time for both groups, but we found no benefits of prism adaptation beyond sham treatment. Our findings do not support the efficacy of prism adaptation treatment for relieving upper-limb CRPS-I. This trial was prospectively registered (ISRCTN46828292).
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Affiliation(s)
- Monika Halicka
- Centre for Pain Research, University of Bath, Bath, United Kingdom
- Department of Psychology, University of Bath, Bath, United Kingdom
| | - Axel D. Vittersø
- Centre for Pain Research, University of Bath, Bath, United Kingdom
- Department of Psychology, University of Bath, Bath, United Kingdom
- Department of Sport and Health Sciences, University of Exeter, Exeter, United Kingdom
| | - Hayley McCullough
- Department of Translational Medicine, Pain Research Institute, University of Liverpool, Liverpool, United Kingdom
| | - Andreas Goebel
- Department of Translational Medicine, Pain Research Institute, University of Liverpool, Liverpool, United Kingdom
- Department of Pain Medicine, Walton Centre NHS Foundation Trust, Liverpool, United Kingdom
| | - Leila Heelas
- Optimise Pain Rehabilitation Unit, Oxford University Hospitals NHS Trust, Oxford, United Kingdom
| | - Michael J. Proulx
- Department of Psychology, University of Bath, Bath, United Kingdom
- Department of Computer Science, Centre for Real & Virtual Environments Augmentation Labs, University of Bath, Bath, United Kingdom
| | - Janet H. Bultitude
- Centre for Pain Research, University of Bath, Bath, United Kingdom
- Department of Psychology, University of Bath, Bath, United Kingdom
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Prablanc C, Panico F, Fleury L, Pisella L, Nijboer T, Kitazawa S, Rossetti Y. Adapting terminology: clarifying prism adaptation vocabulary, concepts, and methods. Neurosci Res 2020; 153:8-21. [DOI: 10.1016/j.neures.2019.03.003] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2019] [Revised: 02/22/2019] [Accepted: 03/18/2019] [Indexed: 11/16/2022]
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Halicka M, Vittersø AD, Proulx MJ, Bultitude JH. Pain reduction by inducing sensory-motor adaptation in Complex Regional Pain Syndrome (CRPS PRISMA): protocol for a double-blind randomized controlled trial. BMC Neurol 2020; 20:62. [PMID: 32075590 PMCID: PMC7031894 DOI: 10.1186/s12883-020-1604-z] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2018] [Accepted: 01/07/2020] [Indexed: 01/04/2023] Open
Abstract
BACKGROUND Complex Regional Pain Syndrome (CRPS) presents as chronic, continuous pain and sensory, autonomic, and motor abnormalities affecting one or more extremities. People with CRPS can also show changes in their perception of and attention to the affected body part and sensory information in the affected side of space. Prism Adaptation (PA) is a behavioural intervention targeted at reducing attention deficits in post-stroke hemispatial neglect. PA also appears to reduce pain and other CRPS symptoms; however, these therapeutic effects have been demonstrated only in small unblinded studies. This paper describes the protocol for an ongoing double-blind, randomized, sham-controlled clinical trial that will evaluate the efficacy of PA treatment for CRPS. The secondary aims of the study are to examine the relationships between neuropsychological changes (such as spatial attention, space and body representation, and motor spatial performance) and clinical manifestations of CRPS, as well as symptom improvement. METHODS Forty-two participants with upper-limb CRPS type I will undergo 2 weeks of twice-daily PA treatment or sham treatment. The primary outcome measures are current pain intensity and CRPS severity score, measured immediately before and after the treatment period. Secondary outcome measures include the results of self-report questionnaires about pain, movement, symptoms interference, and body representation; clinical assessments of sensory, motor, and autonomic functions; and computer-based psychophysical tests of neuropsychological functions. Data are collected in four research visits: 4 weeks and 1 day before treatment, and 1 day and 4 weeks after the end of treatment. Additional follow-up through postal questionnaires is conducted 3 and 6 months post-treatment. DISCUSSION It is hypothesised that participants undergoing PA treatment, compared to those receiving sham treatment, will show greater reduction in pain and CRPS severity score, and improvements on other clinical and neuropsychological measures. Also, more pronounced neuropsychological symptoms are predicted to correlate with more severe clinical CRPS symptoms. This study will provide the first randomized double-blind evaluation of the therapeutic effects of PA that could be implemented as a rehabilitation method for CRPS, and will contribute to the understanding of how neuropsychological changes in body representation and attention pertain to the manifestation and treatment of CRPS. TRIAL REGISTRATION (27/03/2017): ISRCTN46828292 (ISRCTN - ISRCTN46828292: Treatment of complex regional pain syndrome (CRPS) with sensory-motor adaptation).
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Affiliation(s)
- Monika Halicka
- Centre for Pain Research, University of Bath, Claverton Down Road, Bath, BA2 7AY UK
- Department of Psychology, University of Bath, Claverton Down Road, Bath, BA2 7AY UK
| | - Axel D. Vittersø
- Centre for Pain Research, University of Bath, Claverton Down Road, Bath, BA2 7AY UK
- Department of Psychology, University of Bath, Claverton Down Road, Bath, BA2 7AY UK
- Department of Sport & Health Sciences, University of Exeter, Prince of Wales Road, Exeter, EX4 4SB UK
| | - Michael J. Proulx
- Department of Psychology, University of Bath, Claverton Down Road, Bath, BA2 7AY UK
- Centre for Real and Virtual Environments Augmentation Labs, Department of Computer Science, University of Bath, Claverton Down Road, Bath, BA2 7AY UK
| | - Janet H. Bultitude
- Centre for Pain Research, University of Bath, Claverton Down Road, Bath, BA2 7AY UK
- Department of Psychology, University of Bath, Claverton Down Road, Bath, BA2 7AY UK
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On the mechanisms underlying Prism Adaptation: A review of neuro-imaging and neuro-stimulation studies. Cortex 2020; 123:57-71. [DOI: 10.1016/j.cortex.2019.10.003] [Citation(s) in RCA: 34] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2019] [Revised: 09/19/2019] [Accepted: 10/16/2019] [Indexed: 01/09/2023]
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Petitet P, O'Reilly JX, O'Shea J. Towards a neuro-computational account of prism adaptation. Neuropsychologia 2017; 115:188-203. [PMID: 29248498 PMCID: PMC6018603 DOI: 10.1016/j.neuropsychologia.2017.12.021] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2017] [Revised: 11/14/2017] [Accepted: 12/11/2017] [Indexed: 12/15/2022]
Abstract
Prism adaptation has a long history as an experimental paradigm used to investigate the functional and neural processes that underlie sensorimotor control. In the neuropsychology literature, prism adaptation behaviour is typically explained by reference to a traditional cognitive psychology framework that distinguishes putative functions, such as 'strategic control' versus 'spatial realignment'. This theoretical framework lacks conceptual clarity, quantitative precision and explanatory power. Here, we advocate for an alternative computational framework that offers several advantages: 1) an algorithmic explanatory account of the computations and operations that drive behaviour; 2) expressed in quantitative mathematical terms; 3) embedded within a principled theoretical framework (Bayesian decision theory, state-space modelling); 4) that offers a means to generate and test quantitative behavioural predictions. This computational framework offers a route towards mechanistic neurocognitive explanations of prism adaptation behaviour. Thus it constitutes a conceptual advance compared to the traditional theoretical framework. In this paper, we illustrate how Bayesian decision theory and state-space models offer principled explanations for a range of behavioural phenomena in the field of prism adaptation (e.g. visual capture, magnitude of visual versus proprioceptive realignment, spontaneous recovery and dynamics of adaptation memory). We argue that this explanatory framework can advance understanding of the functional and neural mechanisms that implement prism adaptation behaviour, by enabling quantitative tests of hypotheses that go beyond merely descriptive mapping claims that ‘brain area X is (somehow) involved in psychological process Y’. Traditional neuropsychological models of prism adaptation lack precision. Computational models improve explanatory and predictive power. A range of adaptation phenomena can be explained quantitatively. Mathematics offers a bridge between neural mechanisms and behaviour. A neuro-computational approach will advance neuropsychology.
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Affiliation(s)
- Pierre Petitet
- Wellcome Centre for Integrative Neuroimaging (WIN), Oxford Centre for Functional MRI of the Brain (FMRIB), Nuffield Department of Clinical Neurosciences (NDCN), University of Oxford, John Radcliffe Hospital, Headington, Oxford, UK.
| | - Jill X O'Reilly
- Wellcome Centre for Integrative Neuroimaging (WIN), Oxford Centre for Functional MRI of the Brain (FMRIB), Nuffield Department of Clinical Neurosciences (NDCN), University of Oxford, John Radcliffe Hospital, Headington, Oxford, UK; Donders Institute for Brain, Cognition and Behaviour, Radboud University, Nijmegen, Netherlands; Department of Experimental Psychology, University of Oxford, 9 South Parks Road, Oxford OX1 3UD, UK
| | - Jacinta O'Shea
- Wellcome Centre for Integrative Neuroimaging (WIN), Oxford Centre for Functional MRI of the Brain (FMRIB), Nuffield Department of Clinical Neurosciences (NDCN), University of Oxford, John Radcliffe Hospital, Headington, Oxford, UK; Donders Institute for Brain, Cognition and Behaviour, Radboud University, Nijmegen, Netherlands.
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Ohmura Y, Yano S, Katsuhira J, Migita M, Yozu A, Kondo T. Inclination of standing posture due to the presentation of tilted view through an immersive head-mounted display. J Phys Ther Sci 2017; 29:228-231. [PMID: 28265145 PMCID: PMC5332976 DOI: 10.1589/jpts.29.228] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2016] [Accepted: 11/02/2016] [Indexed: 11/24/2022] Open
Abstract
[Purpose] The purpose of the present study is to clarify whether tilted scenery presented
through an immersive head-mounted display (HMD) causes the inclination of standing
posture. [Subjects and Methods] Eleven healthy young adult males who provided informed
consent participated in the experiment. An immersive HMD and a stereo camera were employed
to develop a visual inclination system. The subjects maintained a standing posture twice
for 5s each while wearing the visual inclination system. They performed this task under
two conditions: normal view and 20° leftward tilted view. A three-dimensional motion
analysis system was used to measure the subjects’ postures, and two force plates were used
to measure the vertical component of the floor reaction force of each leg. [Results] In
the 20° leftward tilted view, the head and trunk angles in the frontal plane were
similarly inclined toward the left, and the vertical component of the floor reaction force
increased in the left leg, whereas it decreased in the right leg. [Conclusion] When the
view in the immersive HMD was tilted, the participants’ trunk side bent toward the same
side as that of the view. This visual inclination system seems to be a simple intervention
for changing standing posture.
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Affiliation(s)
- Yuji Ohmura
- Department of Physical Therapy, School of Nursing and Rehabilitation Sciences at Odawara, International University of Health and Welfare, Japan; Department of Computer and Information Sciences, Graduate School of Engineering, Tokyo University of Agriculture and Technology, Japan
| | - Shiro Yano
- Department of Computer and Information Sciences, Graduate School of Engineering, Tokyo University of Agriculture and Technology, Japan
| | - Junji Katsuhira
- Department of Prosthetics & Orthotics and Assistive Technology, Faculty of Medical Technology, Niigata University of Health and Welfare, Japan; Department of Medical Research and Management for Musculoskeletal Pain 22nd Century Medical and Research Center, Faculty of Medicine, The University of Tokyo Hospital, Japan
| | - Masato Migita
- Department of Physical Therapy, School of Nursing and Rehabilitation Sciences at Odawara, International University of Health and Welfare, Japan
| | - Arito Yozu
- Department of Rehabilitation Medicine, The University of Tokyo Hospital, Japan
| | - Toshiyuki Kondo
- Department of Computer and Information Sciences, Graduate School of Engineering, Tokyo University of Agriculture and Technology, Japan
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