Shape encoding consistency across colors in primate V4
Shape encoding consistency across colors in primate V4
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DOI：
10.1152/jn.01063.2011
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发表时间：
2012-09-01
影响因子：
2.5
通讯作者：
Pasupathy, Anitha
中科院分区：
文献类型：
--
作者：
Bushnell, Brittany N.;Pasupathy, Anitha
Bushnell BN，Pasupathy A。灵长类动物 V4 中颜色之间的形状编码一致性。 《神经生理学杂志》108：1299-1308，2012 年。首次发表于 2012 年 6 月 6 日； doi:10.1152/jn.01063.2011.-灵长类动物皮层 V4 区的神经元对视觉刺激的形式和颜色敏感。为了确定形状选择性在不同颜色之间是否保持一致，我们研究了清醒猴子中单个 V4 神经元对以两种不同颜色呈现的一组二维形状的反应。对于每个神经元，我们选择了两种视觉上不同的颜色，并能引起可靠且不同的反应。在神经元中，两种颜色响应之间的相关系数范围为 -0.03 至 0.93（中位数 0.54）。具有高度一致的形状响应（即高相关系数）的神经元对不同形状的响应表现出更大的分散性，即更大的形状选择性，并且也倾向于具有较少偏心的感受野位置；在形状选择性神经元中，形状一致性范围为 0.16 至 0.93（中位数 0.63）。形状反应的一致性与所使用的刺激颜色之间的物理差异和神经元颜色调节的强度无关。最后，我们发现我们对形状响应一致性的测量受到刺激重复次数的强烈影响：基于少于 10 次重复的一致性估计被大大低估。总之，我们的结果表明，可能有助于形状感知和辨别的神经元表现出的形状响应在不同颜色之间基本一致，从而有助于使用更简单的算法来解码来自 V4 神经元群体的形状信息。
Bushnell BN, Pasupathy A. Shape encoding consistency across colors in primate V4. J Neurophysiol 108: 1299-1308, 2012. First published June 6, 2012; doi:10.1152/jn.01063.2011.-Neurons in primate cortical area V4 are sensitive to the form and color of visual stimuli. To determine whether form selectivity remains consistent across colors, we studied the responses of single V4 neurons in awake monkeys to a set of two-dimensional shapes presented in two different colors. For each neuron, we chose two colors that were visually distinct and that evoked reliable and different responses. Across neurons, the correlation coefficient between responses in the two colors ranged from -0.03 to 0.93 (median 0.54). Neurons with highly consistent shape responses, i.e., high correlation coefficients, showed greater dispersion in their responses to the different shapes, i.e., greater shape selectivity, and also tended to have less eccentric receptive field locations; among shape-selective neurons, shape consistency ranged from 0.16 to 0.93 (median 0.63). Consistency of shape responses was independent of the physical difference between the stimulus colors used and the strength of neuronal color tuning. Finally, we found that our measurement of shape response consistency was strongly influenced by the number of stimulus repeats: consistency estimates based on fewer than 10 repeats were substantially underestimated. In conclusion, our results suggest that neurons that are likely to contribute to shape perception and discrimination exhibit shape responses that are largely consistent across colors, facilitating the use of simpler algorithms for decoding shape information from V4 neuronal populations.