Local signals from beyond the receptive fields of striate cortical neurons.
Local signals from beyond the receptive fields of striate cortical neurons.
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DOI：
10.1152/jn.00005.2003
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发表时间：
2003-08
影响因子：
2.5
通讯作者：
James R. Müller;A. Metha;J. Krauskopf;P. Lennie
中科院分区：
文献类型：
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作者：
James R. Müller;A. Metha;J. Krauskopf;P. Lennie
我们在麻醉猕猴身上研究了纹状皮质神经元对感受野内部模式的反应是如何被外部环境模式改变的。由周围环境带来的神经元反应的变化是即时和短暂的：它们出现的潜伏期与感受野内对刺激的反应相同(这表明局部纹状皮质有来源)，但最快27毫秒后就变得不那么有效。周围信号似乎通过与感受野产生的分裂相互作用(归一化)来施加影响。在略微倾斜于择优取向的方向上呈现的周围图案一致地变形了复杂(但不简单)单元的取向调谐曲线，排斥了择优取向，但不降低择优光栅与略微倾斜取向的取向的区分能力。通过降低响应度和改变复杂细胞在刺激空间的局部调谐，周围模式降低了神经元对特定刺激的反应之间的相关性，从而减少了图像表示的冗余性。
We examined in anesthetized macaque how the responses of a striate cortical neuron to patterns inside the receptive field were altered by surrounding patterns outside it. The changes in a neuron's response brought about by a surround are immediate and transient: they arise with the same latency as the response to a stimulus within the receptive field (this argues for a source locally in striate cortex) and become less effective as soon as 27 ms later. Surround signals appeared to exert their influence through divisive interaction (normalization) with those arising in the receptive field. Surrounding patterns presented at orientations slightly oblique to the preferred orientation consistently deformed orientation tuning curves of complex (but not simple) cells, repelling the preferred orientation but without decreasing the discriminability of the preferred grating and ones at slightly oblique orientations. By reducing responsivity and changing the tuning of complex cells locally in stimulus space, surrounding patterns reduce the correlations among responses of neurons to a particular stimulus, thus reducing the redundancy of image representation.