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首页> 外文期刊>Neuropsychologia >Bilateral hand representations in human primary proprioceptive areas.
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Bilateral hand representations in human primary proprioceptive areas.

机译：在人类主要本体感受性区域中的双边手部表示。

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Sensory representations in the postcentral gyrus are supposed to be strictly lateralised and to provide spatially unbiased representations of limb positions. However, electrophysiological and behavioural measurements in humans and non-human primates tentatively suggested some degree of bilateral processing even in early somatosensory areas. We report a patient who suffered a small and confined lesion of the hand area in the postcentral gyrus that resulted in a proprioceptive deficit without any concomitant primary motor impairment. We performed a finger position-matching task with target locations being defined proprioceptively. Without visual feedback of either hand, the patient demonstrated a significant leftward shift of perceived locations when reaching with the ipsilesional right hand to her contralesional left hand and an opposite rightward shift when reaching with the left hand to the position of the right hand. Although these directional errors improved when vision of the active hand was allowed, errors were still significantly larger than those of age-matched healthy controls with unconstrained view of the active contralesional hand. Reaching to visual targets without visual online feedback the patient revealed comparable errors with both hands. Reaching to visual targets with full visual feedback, she was as accurate as controls with either hand. In summary, our data demonstrate an effect of the right postcentral lesion on proprioceptive information processing for both hands. The results suggest an integration of contralateral and ipsilateral proprioceptive information already at this early processing stage possibly mediated by callosal connections.
机译：中央后回的感觉代表被严格地横向化，并提供肢体位置的空间无偏见。然而，人类和非人类灵长类动物的电生理和行为测量初步表明，即使在早期的体感区域，也有一定程度的双边处理。我们报告了一名患者，该患者在中枢回后手部区域受到了小而狭窄的病变，导致本体感受器缺陷，而没有任何原发性运动障碍。我们执行了手指位置匹配任务，并通过本体定义了目标位置。在没有两只手的视觉反馈的情况下，患者在患病右手到达对侧左手时表现出感知位置的明显左移，而在左手到达右手位置时表现出相反的右移。尽管在允许活动手的视线的情况下，这些方向性错误得到了改善，但是错误仍然比年龄匹配的健康对照者大，而活动对侧手的视野不受限制。在没有视觉在线反馈的情况下到达患者的视觉目标时，患者的双手出现了类似的错误。通过完全的视觉反馈达到视觉目标，她的两只手都与对照一样准确。总而言之，我们的数据证明了正确的中心后病变对双手本体感受信息处理的影响。结果表明对侧和同侧本体感受信息的整合已经在这个早期处理阶段，可能由call连接引起。

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