Surround suppression by high spatial frequency stimuli in the cat primary visual cortex
Surround suppression by high spatial frequency stimuli in the cat primary visual cortex
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DOI：
10.1111/j.1460-9568.2010.07572.x
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发表时间：
2011-01
影响因子：
3.4
通讯作者：
Hironobu Osaki;T. Naito;O. Sadakane;M. Okamoto;Hiromichi Sato
中科院分区：
文献类型：
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作者：
Hironobu Osaki;T. Naito;O. Sadakane;M. Okamoto;Hiromichi Sato
环绕抑制是一种现象，其中刺激经典外感受野抑制性地调节初级视觉皮层（V1）（也称为17区）中神经元的视觉反应。已知环绕抑制调谐到比经典感受野调谐到的频率低得多且宽得多的空间频率（SF）。在这项研究中，我们测试了不同的SFs对环绕抑制的影响，通过使用圆形正弦光栅补丁，涵盖了经典的感受野和extraclassical感受野。使用面积总和调谐曲线，我们在猫V1中发现了高SF调谐的环绕声抑制。这种高SF调谐的环绕声抑制导致SF调谐在大刺激下转向低SF。通过模拟一个缺乏抑制性环绕机制的模型神经元，我们证实了这些首选的SF移位在没有环绕抑制的情况下不会发生。我们推测，高SF调谐抑制（根据大小改变首选SF）在功能上有助于V1中视觉图像的尺度不变处理。
Surround suppression is a phenomenon whereby stimulation of the extraclassical receptive field suppressively modulates the visual responses of neurons in the primary visual cortex (V1) (also known as area 17). It is known that surround suppression tunes to spatial frequencies (SFs) that are much lower and broader than the frequencies to which the classical receptive field tunes. In this study, we tested the effects of varying SFs on surround suppression by using a circular sinusoidal grating patch that covered both the classical receptive field and the extraclassical receptive field. Using area‐summation tuning curves, we found high‐SF‐tuned surround suppression in the cat V1. This high‐SF‐tuned surround suppression causes the SF tuning to shift to low SF for large stimuli. By simulating a model neuron lacking a suppressive surround mechanism, we confirmed that these preferred SF shifts do not occur in the absence of surround suppression. We surmise that the high‐SF‐tuned suppression, which shifts the preferred SF according to size, functionally contributes to the scale‐invariant processing of visual images in V1.