Learning to stand with unexpected sensorimotor delays

eLife

Patrick A Forbes¹  Romeo Chua²  Ian Franks²  J Timothy Inglis³  Jean-Sébastien Blouin⁴  Ryan M Peters⁵  Oscar Ortiz⁶  Brandon G Rasman⁷ 

[1] Department of Neuroscience, Erasmus MC, University Medical Center Rotterdam, Rotterdam, Netherlands;School of Kinesiology, University of British Columbia, Vancouver, Canada;School of Kinesiology, University of British Columbia, Vancouver, Canada;Djavad Mowafaghian Centre for Brain Health, University of British Columbia, Vancouver, Canada;School of Kinesiology, University of British Columbia, Vancouver, Canada;Djavad Mowafaghian Centre for Brain Health, University of British Columbia, Vancouver, Canada;Institute for Computing, Information and Cognitive Systems, University of British Columbia, Vancouver, Canada;School of Kinesiology, University of British Columbia, Vancouver, Canada;Faculty of Kinesiology, University of Calgary, Calgary, Canada;Hotchkiss Brain Institute, Calgary, Canada;School of Kinesiology, University of British Columbia, Vancouver, Canada;Faculty of Kinesiology, University of New Brunswick, Fredericton, Canada;School of Physical Education, Sport, and Exercise Sciences, University of Otago, Dunedin, New Zealand;Department of Neuroscience, Erasmus MC, University Medical Center Rotterdam, Rotterdam, Netherlands;School of Kinesiology, University of British Columbia, Vancouver, Canada;

关键词: sensorimotor delay;    sensorimotor adaptation;    standing balance control;    vestibular;    motion perception;    posture;    Human;   

DOI  :  10.7554/eLife.65085

来源: eLife Sciences Publications, Ltd

【 摘 要 】

Human standing balance relies on self-motion estimates that are used by the nervous system to detect unexpected movements and enable corrective responses and adaptations in control. These estimates must accommodate for inherent delays in sensory and motor pathways. Here, we used a robotic system to simulate human standing about the ankles in the anteroposterior direction and impose sensorimotor delays into the control of balance. Imposed delays destabilized standing, but through training, participants adapted and re-learned to balance with the delays. Before training, imposed delays attenuated vestibular contributions to balance and triggered perceptions of unexpected standing motion, suggesting increased uncertainty in the internal self-motion estimates. After training, vestibular contributions partially returned to baseline levels and larger delays were needed to evoke perceptions of unexpected standing motion. Through learning, the nervous system accommodates balance sensorimotor delays by causally linking whole-body sensory feedback (initially interpreted as imposed motion) to self-generated balance motor commands.

【 授权许可】

CC BY