Motor and parietal cortical areas both underlie kinaesthesia
Motor and parietal cortical areas both underlie kinaesthesia
复制标题
DOI：
10.1016/s0926-6410(02)00221-5
复制
发表时间：
2003-03-01
期刊：
影响因子：
--
通讯作者：
Roll, JP
中科院分区：
文献类型：
--
作者：
Romaiguère, P;Anton, JL;Roll, JP
肌腱振动长期以来被认为是通过激活肌梭初级末梢来唤起对错觉运动的感知。然而，很少有研究涉及导致这些动觉错觉的皮层过程。我们设想了一个功能磁共振成像实验来研究参与这些错觉的皮层结构。由于肌梭传入投射到参与运动控制的不同皮层区域，因此有必要区分与感觉过程相关的激活和与感知过程相关的激活。为此，我们设计并比较了不同的条件。在两种错觉条件下，右腕屈肌和伸肌群的肌腱在不同频率下的共同振动诱发了慢或快错觉运动的感知。在没有错觉的条件下，这些拮抗肌群的肌腱以相同频率的共同振动不会引起运动的感觉。结果表明，在这两种错觉条件下，大多数参与感觉运动控制的皮层区域都被激活。然而，在大多数区域，当感知到的运动更快时，激活往往更大。在无错觉条件下，运动区和运动前区很少或不被激活。具体的对比表明，一个虚幻的运动的感知是特别相关的激活在左前运动，感觉运动，顶叶皮层以及在双边补充运动和扣带运动区。我们的结论是，运动区和顶骨区的激活对于动觉的产生是必要的。(C)2002 Elsevier Science B.V.保留所有权利。
Tendon vibration has long been known to evoke perception of illusory movements through activation of muscle spindle primary endings. Few studies, however, have dealt with the cortical processes resulting in these kinaesthetic illusions. We conceived an fMRI experiment to investigate the cortical structures taking part in these illusory perceptions. Since muscle spindle afferents project onto different cortical areas involved in motor control it was necessary to discriminate between activation related to sensory processes and activation related to perceptual processes. To this end, we designed and compared different conditions. In two illusion conditions, covibration at different frequencies of the tendons of the right wrist flexor and extensor muscle groups evoked perception of slow or fast illusory movements. In a no illusion condition, covibration at the same frequency of the tendons of these antagonist muscle groups did not evoke a sensation of movement. Results showed activation of most cortical areas involved in sensorimotor control in both illusion conditions. However, in most areas, activation tended to be larger when the movement perceived was faster. In the no illusion condition, motor and premotor areas were little or not activated. Specific contrasts showed that perception of an illusory movement was specifically related to activation in the left premotor, sensorimotor, and parietal cortices as well as in bilateral supplementary motor and cingulate motor areas. We conclude that activation in motor as well as in parietal areas is necessary for a kinaesthetic sensation to arise. (C) 2002 Elsevier Science B.V. All rights reserved.