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Angle of gaze and optic flow direction modulate body sway
- Source :
- Journal of Electromyography and Kinesiology. 35:61-68
- Publication Year :
- 2017
- Publisher :
- Elsevier BV, 2017.
-
Abstract
- Optic flow is a crucial signal in maintaining postural stability. We sought to investigate whether the activity of postural muscles and body sway was modulated by eye position during the view of radial optic flow stimuli. We manipulated the spatial distribution of dot speed and the fixation point position to simulate specific heading directions combined with different gaze positions. The experiments were performed using stabilometry and surface electromyography (EMG) on 24 right-handed young, healthy volunteers. Center of pressure (COP) signals were analyzed considering antero-posterior and medio-lateral oscillation, COP speed, COP area, and the prevalent direction of oscillation of body sway. We found a significant main effect of body side in all COP parameters, with the right body side showing greater oscillations. The different combinations of optic flow and eye position evoked a non-uniform direction of oscillations in females. The EMG analysis showed a significant main effect for muscle and body side. The results showed that the eye position modulated body sway without changing the activity of principal leg postural muscles, suggesting that the extraretinal input regarding the eye position is a crucial signal that needs to be integrated with perceptual optic flow processing in order to control body sway.
- Subjects :
- Adult
Male
medicine.medical_specialty
genetic structures
Posture
Eye position
Biophysics
Neuroscience (miscellaneous)
Fixation, Ocular
Optic Flow
Electromyography
050105 experimental psychology
03 medical and health sciences
0302 clinical medicine
Physical medicine and rehabilitation
Center of pressure (terrestrial locomotion)
medicine
Humans
Gender difference
0501 psychology and cognitive sciences
Computer vision
Muscle, Skeletal
Postural Balance
Physics
medicine.diagnostic_test
business.industry
05 social sciences
Postural control
Flow direction
Gaze
Fixation point
Body sway
Biophysic
Postural stability
Female
Neurology (clinical)
Artificial intelligence
Visual system
business
psychological phenomena and processes
030217 neurology & neurosurgery
Subjects
Details
- ISSN :
- 10506411
- Volume :
- 35
- Database :
- OpenAIRE
- Journal :
- Journal of Electromyography and Kinesiology
- Accession number :
- edsair.doi.dedup.....70d5aef7e52ed58189f104fd6ccde1f1