A functional and perceptual signature of the second visual area in primates.

A functional and perceptual signature of the second visual area in primates.
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DOI:
10.1038/nn.3402
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发表时间:
2013-07
影响因子:
25
通讯作者:
Movshon, Anthony
Movshon, Anthony
中科院分区:
医学1区
文献类型:
--
作者:
Freeman, Jeremy;Ziemba, Corey M.;Heeger, David J.;Simoncelli, Eero P.;Movshon, Anthony

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关于第二视觉皮质区(V2)的功能,目前还没有被普遍接受的解释,部分原因是没有简单的反应特性将V2神经元与初级视觉皮质区(V1)的神经元区分开来。我们构建了复制自然纹理图像中发现的高阶统计依赖性的合成刺激,并使用它们来刺激猕猴V1和V2神经元。大多数V2细胞对这些纹理的反应比控制缺乏自然结构的刺激更强烈;V1细胞则没有。人类的功能磁共振成像测量显示V1和V2之间的差异与神经元的测量结果相似。人类观察者在不同类型的纹理中检测自然结构的能力可以通过V2的神经元和fMRI反应的强度很好地预测,但在V1中却不能。总之,这些结果揭示了V2在自然图像结构表示中的一种新颖而特殊的作用。
There is no generally accepted account of the function of the second visual cortical area (V2), partly because no simple response properties robustly distinguish V2 neurons from those in primary visual cortex (V1). We constructed synthetic stimuli replicating the higher-order statistical dependencies found in natural texture images, and used them to stimulate macaque V1 and V2 neurons. Most V2 cells responded more vigorously to these textures than to control stimuli lacking naturalistic structure; V1 cells did not. fMRI measurements in humans revealed differences between V1 and V2 that paralleled the neuronal measurements. The ability of human observers to detect naturalistic structure in different types of texture was well predicted by the strength of neuronal and fMRI responses in V2 but not in V1. Together, these results reveal a novel and particular role for V2 in the representation of natural image structure.
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