psychophysiological responses during motor imagery

使用功能磁共振成像来测量运动想象过程中的大脑活动。一位世界级游泳运动员参与了这项研究。包括5个表象任务：无任务提示的游泳表象、有任务提示的游泳表象、比赛预演、无任务提示的跑步表象、有任务提示的跑步表象。被试选择任务进行比较：1)熟练表演和非熟练表演的表象；2)有特定任务线索和无任务线索的表象；3)心理练习表象和心理排练表象。除赛跑预演外，其余四项任务均采用区块范式(Rest-Image)，激活辅助运动区(SMA)，这与前人关于SMA主要参与运动表象的研究结果一致。在无任务线索的表象中，无论是游泳还是跑步，运动前皮质和初级运动皮质都被激活。只有在没有任务提示的游泳图像中，才能观察到右侧小脑的轻微激活。这些发现大体上支持了先前的研究，即运动想象与实际运动表现共享共同的神经网络。然而，由于数据点不足，本研究没有显示出不同任务之间的任何差异。

Brain activity during motor imagery was measured, using Functional magnetic resonance imaging. One world-class swimmer participated in the study. Five imagery tasks were included ; swimming image without task cue, swimming image with task cue, race rehearsal, running image without task cue, running image with task cue. The tasks were chosen to compare between 1) imagery of skilled performance and unskilled performance, 2) imagery with specific task cue and without task cue, and 3) mental practice imagery and mental rehearsal imagery. Block paradigm (Rest-Image) was utilized In four tasks except for race rehearsal, supplementary motor area (SMA) was activated, being consistent with previous findings that SMA is largely involved in motor imagery. During imagery without task cue, both in swimming and running, premotor cortex and primary motor cortex were activated. Only in swimming image without task cue, slight activation of right cerebellum was observed. These findings generally support the previous studies that motor imagery shares the common nueralnetwork with actual motor performance. The present study, however, did not show any difference among varied tasks, due to insufficient data point.