Projections of small regions (domains) of primary motor cortex (M1), premotor cortex (PMC) and posterior parietal cortex (PPC) to the striatum of squirrel monkeys were revealed by restricted injections of anterograde tracers. As many as 8 classes of action-specific domains can be identified in PPC, as well as in PMC and M1, and some have been identified for injections by the action evoked by 0.5 s trains of electrical microstimulation. Injections of domains in all three cortical regions labeled dense patches of terminations in the matrix of the ipsilateral putamen, while providing sparse or no projections to corresponding regions of the contralateral putamen. When two or three of these domains were injected with different tracers, projection fields in the putamen were highly overlapped for injections in functionally matched domains across cortical areas, but were highly segregated for injections placed in functionally mismatched domains. While not all classes of domains were studied, the results suggest that the striatum potentially has separate representations of eight or more classes of actions that receive inputs from domains in three or more cortical regions in sensorimotor cortex. The overlap/segregation of cortico-striatal projections correlates with the strength of cortico-cortical connections between injected motor areas.

初级运动皮层 (M1)、前运动皮层 (PMC) 和后顶叶皮层 (PPC) 的小区域（域）向松鼠猴纹状体的投射通过限制性注射顺行示踪剂来揭示。在 PPC 以及 PMC 和 M1 中可以识别多达 8 类特定于动作的域，并且通过 0.5 s 电微刺激序列诱发的动作已识别出一些用于注射。在所有三个皮层区域注射域标记了同侧壳核矩阵中密集的终止斑块，同时向对侧壳核的相应区域提供稀疏或没有投影。当这些域中的两个或三个被注入不同的示踪剂时，壳核中的投影场高度重叠，用于跨皮质区域的功能匹配域中的注射，但对于放置在功能不匹配域中的注射则高度隔离。虽然并未研究所有类别的域，但结果表明，纹状体可能具有八种或更多类动作的单独表示，这些动作接收来自感觉运动皮层中三个或更多皮层区域的域的输入。皮质-纹状体投射的重叠/分离与注射运动区域之间皮质-皮质连接的强度相关。结果表明，纹状体可能具有八种或更多类动作的单独表示，这些动作接收来自感觉运动皮层中三个或更多皮层区域的域的输入。皮质-纹状体投射的重叠/分离与注射运动区域之间皮质-皮质连接的强度相关。结果表明，纹状体可能具有八种或更多类动作的单独表示，这些动作接收来自感觉运动皮层中三个或更多皮层区域的域的输入。皮质-纹状体投射的重叠/分离与注射运动区域之间皮质-皮质连接的强度相关。