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共线特征会削弱大鼠的视觉检测能力。

Collinear features impair visual detection by rats.

作者信息

Meier Philip, Flister Erik, Reinagel Pamela

机构信息

Department of Neurosciences, University of California-San Diego, 9500 Gilman Drive, La Jolla, CA 92093-0357, USA.

出版信息

J Vis. 2011 Mar 31;11(3):22. doi: 10.1167/11.3.22.

Abstract

We measure rats' ability to detect an oriented visual target grating located between two flanking stimuli ("flankers"). Flankers varied in contrast, orientation, angular position, and sign. Rats are impaired at detecting visual targets with collinear flankers, compared to configurations where flankers differ from the target in orientation or angular position. In particular, rats are more likely to miss the target when flankers are collinear. The same impairment is found even when the flanker luminance was sign-reversed relative to the target. These findings suggest that contour alignment alters visual processing in rats, despite their lack of orientation columns in the visual cortex. This is the first report that the arrangement of visual features relative to each other affects visual behavior in rats. To provide a conceptual framework for our findings, we relate our stimuli to a contrast normalization model of early visual processing. We suggest a pattern-sensitive generalization of the model that could account for a collinear deficit. These experiments were performed using a novel method for automated high-throughput training and testing of visual behavior in rodents.

摘要

我们测量大鼠检测位于两个侧翼刺激(“侧翼”)之间的定向视觉目标光栅的能力。侧翼在对比度、方向、角位置和符号方面有所不同。与侧翼在方向或角位置上与目标不同的配置相比,大鼠在检测具有共线侧翼的视觉目标时存在障碍。特别是,当侧翼共线时,大鼠更有可能错过目标。即使侧翼亮度相对于目标符号反转,也会发现相同的障碍。这些发现表明,轮廓对齐会改变大鼠的视觉处理,尽管它们的视觉皮层中缺乏定向柱。这是第一份关于视觉特征彼此之间的排列会影响大鼠视觉行为的报告。为了为我们的发现提供一个概念框架,我们将我们的刺激与早期视觉处理的对比度归一化模型联系起来。我们提出了该模型的一种模式敏感的推广,它可以解释共线缺陷。这些实验是使用一种用于啮齿动物视觉行为的自动高通量训练和测试的新方法进行的。

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