INTEGRATION OF MOTION AND STEREOPSIS IN MIDDLE TEMPORAL CORTICAL AREA OF MACAQUES
INTEGRATION OF MOTION AND STEREOPSIS IN MIDDLE TEMPORAL CORTICAL AREA OF MACAQUES
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DOI：
10.1038/373609a0
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发表时间：
1995-02-16
期刊：
影响因子：
64.8
通讯作者：
ANDERSEN, RA
中科院分区：
文献类型：
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作者：
BRADLEY, DC;QIAN, N;ANDERSEN, RA
灵长类动物的视觉系统包含一个高度专业化的子系统，用于分析视野中的运动（1-6）。该子系统的关键元素是中颞（MT）皮质区，其中包含大多数方向选择神经元（1-3）。MT神经元也对双眼视差（深度）具有选择性，这令人困惑，因为它们对深度运动不敏感（7）。差异在MT中的作用是什么？我们的数据表明差异和透明运动检测之间存在重要联系。在给定的MT感受野内，不同方向的运动信号倾向于相互抑制（8）。这种抑制具有平均效应，其使MT对由光强度变化和其他非运动刺激（运动噪声）产生的随机运动信号的响应最小化9。但是，在没有视差线索的情况下，抑制也可能发生在通过视野的同一部分（透明运动）以不同方向移动的表面之间，从而损害对任一表面的检测。在这里，我们表明，抑制MT主要发生在运动信号具有相似的差距。因此，不同深度处的透明表面运动在MT中独立地表示（即，彼此不抑制），而来自给定表面的伪运动信号趋于抵消。据我们所知，这些结果提供了第一个证据的功能整合的运动和视差的MT。
THE primate visual system incorporates a highly specialized subsystem for the analysis of motion in the visual field(1-6). A key element of this subsystem is the middle temporal (MT) cortical area, which contains a majority of direction-selective neurons(1-3). MT neurons are also selective for binocular disparity (depth), which is perplexing given that they are not sensitive to motion through depth(7). What is the role of disparity in MT? Our data suggest an important link between disparity and transparent motion detection. Motion signals in different directions tend to inhibit each other within a given MT receptive field(8). This inhibition has an averaging effect which minimizes MT responses to random motion signals created by light intensity changes and other non-motion stimuli (motion noise)9. But, in the absence of disparity cues, inhibition may also occur between surfaces moving in different directions through the same part of the visual field (transparent motion), thus impairing the detection of either surface. Here we show that inhibition in MT occurs mainly between motion signals with similar disparities. Transparent surface movements at different depths are thus represented independently in MT (that is, without inhibiting each other) whereas spurious motion signals from a given surface tend to cancel out. To our knowledge, these results provide the first evidence for a functional integration of motion and disparity in MT.