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首页> 外文期刊>Journal of Neurophysiology >Neuronal activity in the primate motor thalamus during visually triggered and internally generated limb movements.
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Neuronal activity in the primate motor thalamus during visually triggered and internally generated limb movements.

机译：在视觉触发和内部产生的肢体运动过程中，灵长类运动丘脑的神经元活动。

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Single-unit recordings were made from the basal-ganglia- and cerebellar-receiving areas of the thalamus in two monkeys trained to make arm movements that were either visually triggered (VT) or internally generated (IG). A total of 203 neurons displaying movement-related changes in activity were examined in detail. Most of these cells (69%) showed an increase in firing rate in relation to the onset of movement and could be categorized according to whether they fired in the VT task exclusively, in the IG task exclusively, or in both tasks. The proportion of cells in each category was found to vary between each of the cerebellar-receiving [oral portion of the ventral posterolateral nucleus (VPLo) and area X] and basal-ganglia-receiving [oral portion of the ventral lateral nucleus (VLo) and parvocellular portion of the ventral anterior nucleus (VApc)] nuclei that were examined. In particular, in area X the largest group of cells (52%) showed an increase in activity during the VT task only, whereas in VApc the largest group of cells (53%) fired in the IG task only. In contrast to this, relatively high degree of task specificity, in both VPLo and VLo the largest group of cells ( approximately 55%) burst in relation to both tasks. Of the cells that were active in both tasks, a higher proportion were preferentially active in the VT task in VPLo and area X, and the IG task in VLo and VApc. In addition, cells in all four nuclei became active earlier relative to movement onset in the IG task compared with the VT task. These results demonstrate that functional distinctions do exist in the cerebellar- and basal-ganglia-receiving portions of the primate motor thalamus in relation to the types of cues used to initiate and control movement. These distinctions are most clear in area X and VApc, and are much less apparent in VPLo and VLo.
机译：从两只猴子的丘脑的基底神经节和小脑接收区域进行了单单位记录，这些猴子经过训练后可以进行视觉触发（VT）或内部产生（IG）的手臂动作。总共检查了203个神经元，这些神经元显示出与运动相关的活动变化。这些电池中的大多数（69％）显示出与运动开始有关的发射速率增加，可以根据是在VT任务中，仅在IG任务中还是在两个任务中均进行发射进行分类。发现每个类别中的细胞比例在每个小脑接收区[腹侧后外侧核的口腔部分（VPLo）和X区域]和基底神经节接收区[腹侧外侧核的口腔部分（VLo）之间有所不同和腹侧前核（VApc）]小核的小细胞部分。特别是，在区域X中，最大的一组细胞（52％）仅在VT任务期间显示出活动增加，而在VApc中，最大的一组细胞（53％）仅在IG任务中发射。与此相反，相对较高的任务特异性，在VPLo和VLo中，最大的一组细胞（约55％）相对于这两个任务都爆发了。在两个任务中都处于活动状态的单元中，较高比例的优先级在VPLo和X区域中的VT任务中以及在VLo和VApc中的IG任务中处于活动状态。此外，与VT任务相比，相对于IG任务中的运动开始，所有四个核中的细胞都变得更活跃。这些结果表明，在灵长类动物丘脑的小脑和基底神经节接收部分确实存在功能差异，这与用于启动和控制运动的提示类型有关。这些区别在区域X和VApc中最明显，而在VPLo和VLo中则不太明显。

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