Weakened feedback abolishes neural oblique effect evoked by pseudo-natural visual stimuli in area 17 of the cat
Weakened feedback abolishes neural oblique effect evoked by pseudo-natural visual stimuli in area 17 of the cat
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DOI：
10.1016/j.neulet.2008.03.054
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发表时间：
2008-05
影响因子：
2.5
通讯作者：
W. Shen;Zhiyin Liang;T. Shou
中科院分区：
文献类型：
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作者：
W. Shen;Zhiyin Liang;T. Shou
心理倾斜效应是一种众所周知的现象，即人类和一些哺乳动物在视觉上对基本轮廓（垂直和水平）比斜向轮廓更敏感，这通常与视觉皮层中对基本方向的过度表征有关。然而，与倾斜效应相反，Essock等人[E.A.]Essock， J.K. DeFord， B.C. Hansen， M.J. Sinai，《斜向刺激是最好的（不是最坏的！）宽带刺激：水平效应》，《视觉评论》43(2003)1329-1335》报道了一种心理上的“水平效应”，即当使用独特的自然宽带刺激进行测试时，由斜向主导的视觉刺激被人类受试者感知得最好。在这项研究中，使用光学成像和类似的视觉刺激，我们发现在猫的17区有一个基本方向的过度代表，即神经倾斜效应，而不是“水平效应”。另外，在21a区添加GABA可以消除斜向效应，这是由于21a区神经元的优先取向移动（6.0%）和17区神经元的取向选择强度降低（26.9%）。这些结果表明，当动物观看更自然的场景时，倾斜效应是基于神经元的，而“水平效应”则没有证据。
The psychological oblique effect, a well-known phenomenon that humans and some mammals are more visually sensitive to cardinal (vertical and horizontal) contours than to oblique ones, has commonly been associated with the overrepresentation of cardinal orientations in the visual cortex. In contrast to the oblique effect, however, Essock et al. [E.A. Essock, J.K. DeFord, B.C. Hansen, M.J. Sinai, Oblique stimuli are seen best (not worst!) broad-band stimuli: a horizontal effect, Vision Res. 43 (2003) 1329–1335] reported a psychological ‘horizontal effect’, in which visual stimuli dominated by oblique orientations were best perceived by human subjects when tested with unique natural broad-band stimuli. In this study, using optical imaging and the similar visual stimuli, we found an overrepresentation of cardinal orientations, i.e. the neural oblique effect, but not ‘horizontal effect’, in area 17 of the cat. In addition, the oblique effect was abolished by GABA administration in area 21a due to the preferred orientation shifting (6.0%) and decrease of orientation selectivity strength of neurons (26.9%) in area 17. These results indicate a neuronal basis of the oblique effect when animals watch a more natural scene, whereas no evidence was found for the ‘horizontal effect’.