Putative pyramidal neurons and interneurons in the monkey parietal cortex make different contributions to the performance of a visual grouping task.
Putative pyramidal neurons and interneurons in the monkey parietal cortex make different contributions to the performance of a visual grouping task.
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DOI：
10.1152/jn.00160.2010
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发表时间：
2010-09
影响因子：
2.5
通讯作者：
I. Yokoi;H. Komatsu
中科院分区：
文献类型：
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作者：
I. Yokoi;H. Komatsu
离散元素的视觉分组是对象识别的重要功能。我们最近进行了一项实验来研究视觉分组的神经相关性。我们记录了猴子执行分组检测任务时的神经元活动，其中它们辨别由交叉排列的离散点组成的视觉模式，并检测具有相同对比度的点水平或垂直对齐的目标。我们发现顶内沟侧岸的一些神经元表现出与视觉分组相关的活动。在本研究中，我们分析了不同类型的神经元如何促进视觉分组。我们根据动作电位的持续时间将记录的神经元分类为假定的锥体神经元或假定的中间神经元。我们发现假定的锥体神经元对目标的方向表现出选择性，并且这种选择性通过对特定目标方向的关注而增强。相比之下，无论目标的方向如何，假定的中间神经元对目标刺激的反应比对非目标刺激的反应更强烈。这些结果表明，不同类别的顶叶神经元对离散元素的分组有不同的贡献。
Visual grouping of discrete elements is an important function for object recognition. We recently conducted an experiment to study neural correlates of visual grouping. We recorded neuronal activities while monkeys performed a grouping detection task in which they discriminated visual patterns composed of discrete dots arranged in a cross and detected targets in which dots with the same contrast were aligned horizontally or vertically. We found that some neurons in the lateral bank of the intraparietal sulcus exhibit activity related to visual grouping. In the present study, we analyzed how different types of neurons contribute to visual grouping. We classified the recorded neurons as putative pyramidal neurons or putative interneurons, depending on the duration of their action potentials. We found that putative pyramidal neurons exhibited selectivity for the orientation of the target, and this selectivity was enhanced by attention to a particular target orientation. By contrast, putative interneurons responded more strongly to the target stimuli than to the nontargets, regardless of the orientation of the target. These results suggest that different classes of parietal neurons contribute differently to the grouping of discrete elements.