Neural Basis for Stereopsis from Second-Order Contrast Cues
Neural Basis for Stereopsis from Second-Order Contrast Cues
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DOI：
10.1523/jneurosci.4379-05.2006
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发表时间：
2006-04
期刊：
影响因子：
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通讯作者：
Hiroki Tanaka;I. Ohzawa
中科院分区：
文献类型：
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作者：
Hiroki Tanaka;I. Ohzawa
Humans and animals use visual cues such as brightness and color boundaries to identify objects and navigate through environments. However, even when these cues are not available, we can effortlessly perform these tasks by using second-order cues such as contrast variation (envelope) of patterns on surfaces. Previously, numerous psychophysical studies examined properties of binocular depth processing based on the contrast-envelope cues and suggested the existence of a stereo system that uses these cues. However, its physiological substrate has not been identified yet. Here, we show that a subset of cortical neurons in cat area 18 show binocular interactions for the contrast-envelope stimuli. These neurons are capable of representing a variety of depths in the three-dimensional space based on the information available from contrast cues alone. Furthermore, these neurons show similar disparity-tuning curves for borders defined by both luminance and contrast cues. This cue-invariant tuning is consistent with a linear binocular convergence model for monocular luminance and contrast-envelope processing pathways.
