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首页> 外文期刊>Journal of Neurophysiology >Responses of cells in the tail of the caudate nucleus during visual discrimination learning.
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Responses of cells in the tail of the caudate nucleus during visual discrimination learning.

机译：视觉辨别学习过程中尾状尾核中细胞的反应。

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1. The tail of the caudate nucleus and adjacent ventral putamen (ventrocaudal neostriatum) are major projection sites of the extrastriate visual cortex. Visual information is then relayed, directly or indirectly, to a variety of structures with motor functions. To test for a role of the ventrocaudal neostriatum in stimulus-response association learning, or habit formation, neuronal responses were recorded while monkeys performed a visual discrimination task. Additional data were collected from cells in cortical area TF, which serve as a comparison and control for the caudate data. 2. Two monkeys were trained to perform an asymmetrically reinforced go-no go visual discrimination. The stimuli were complex colored patterns, randomly assigned to be either positive or negative. The monkey was rewarded with juice for releasing a bar when a positive stimulus was presented, whereas a negative stimulus signaled that no reward was available and that the monkey should withhold its response. Neuronal responses were recorded both while the monkey performed the task with previously learned stimuli and while it learned the task with new stimuli. In some cases, responses were recorded during reversal learning. 3. There was no evidence that cells in the ventrocaudal neostriatum were influenced by the reward contingencies of the task. Cells did not fire preferentially to the onset of either positive or negative stimuli; neither did cells fire in response to the reward itself or in association with the motor response of the monkey. Only visual responses were apparent. 4. The visual properties of cells in these structures resembled those of cells in some of the cortical areas projecting to them. Most cells responded selectively to different visual stimuli. The degree of stimulus selectivity was assessed with discriminant analysis and was found to be quantitatively similar to that of inferior temporal cells tested with similar stimuli. Likewise, like inferior temporal cells, many cells in the ventrocaudal neostriatum had large, bilateral receptive fields. Some cells had "doughnut"-shaped receptive fields, with stronger responses in the periphery of both visual fields than at the fovea, similar to the fields of some cells in the superior temporal polysensory area. Although the absence of task-specific responses argues that ventrocaudal neostriatal cells are not themselves the mediators of visual learning in the task employed, their cortical-like visual properties suggest that they might relay visual information important for visuomotor plasticity in other structures. (ABSTRACT TRUNCATED AT 400 WORDS)
机译：1.尾状核的尾巴和邻近的腹侧壳状核（新尾状纹状体）是肝外视觉皮层的主要投射部位。视觉信息然后直接或间接地传递给具有运动功能的各种结构。为了测试新纹状体在刺激-反应联想学习或习惯形成中的作用，在猴子执行视觉辨别任务时记录了神经元反应。从皮层区域TF中的细胞中收集了其他数据，用作尾状数据的比较和对照。 2.训练了两只猴子，以进行不对称加强的禁忌行走视觉辨别。刺激是复杂的彩色图案，随机分配为正或负。当出现正面刺激时，猴子会因释放棒而获得果汁奖励，而负面刺激则表明没有奖励可用，猴子应保留其反应。在猴子用先前学习的刺激执行任务时，以及猴子用新的刺激学习任务时，都记录了神经元反应。在某些情况下，在逆向学习过程中记录了响应。 3.没有证据表明腹膜新纹状体中的细胞受到该任务奖励意外事件的影响。在阳性或阴性刺激发作之前，细胞都不会优先激发。细胞也没有响应奖励本身或与猴子的运动反应相关而激发。仅视觉反应是明显的。 4.这些结构中细胞的视觉特性类似于投射到它们的某些皮质区域中的细胞的视觉特性。大多数细胞对不同的视觉刺激选择性反应。通过判别分析评估了刺激的选择性程度，发现其在数量上与使用类似刺激测试的下颞颞细胞在数量上相似。同样，与下颞细胞一样，新纹状体腹侧的许多细胞具有较大的双侧感受野。一些细胞具有“甜甜圈”形的感受野，在两个视野的边缘处的反应都比在中央凹处的响应强，这类似于颞上多感觉区的一些细胞的视野。尽管缺乏针对特定任务的应答认为腹膜尾新纹状体细胞本身并不是所执行任务中视觉学习的介质，但它们的皮质样视觉特性表明它们可能会传递对其他结构中视觉运动可塑性重要的视觉信息。 （摘要以400字截断）

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