Sensorimotor adaptation in response to proprioceptive bias

被引:13
|
作者
Bernier, Pierre-Michel
Chua, Romeo
Inglis, J. Timothy
Franks, Ian M.
机构
[1] Univ British Columbia, Sch Human Kinet, Vancouver, BC V6T 1Z1, Canada
[2] CNRS, UMR Mouvement & Percetp, Marseille, France
[3] Univ Mediterranee, Marseille, France
基金
加拿大自然科学与工程研究理事会;
关键词
visuomotor adaptation; vision; proprioception; vibration; muscle spindle;
D O I
10.1007/s00221-006-0658-5
中图分类号
Q189 [神经科学];
学科分类号
071006 ;
摘要
Studies investigating visuo-motor adaptation typically introduce sensory conflicts by manipulating visual information (prisms, cursor gains). The purpose of the present study was to determine whether similar adaptation would be observed when a conflict is created through distortion of the proprioceptive sense, rather than through visual distortion. We used a coordinated movement task that required participants to release thumb and index finger at a specific elbow angle during passive elbow extension. Participants could not see their arm, but were shown a cursor representing the forearm on a video screen. In the proprioceptive group, a sensory conflict was introduced by vibrating the biceps brachii muscle, introducing a discrepancy of approximately 7.5 degrees between the proprioceptively perceived and visually perceived elbow angle. In the visual group, a conflict of similar magnitude was obtained by introducing a gain of 7.5 degrees to the cursor with respect to forearm position. Adaptation was assessed by the presence of plastic changes in release elbow angles following a period of exposure to the sensory conflict (i.e., aftereffects). Both groups showed high accuracy during exposure despite the sensory conflicts. More importantly, the visual group presented large and persistent aftereffects, while the proprioceptive group presented none. We suggest that the proprioceptive group's lack of adaptation was due to the artificial muscle spindle activity resulting from vibration, which prevented visual and proprioceptive signals to be merged into a common frame of reference.
引用
收藏
页码:147 / 156
页数:10
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