FUNCTIONAL-PROPERTIES OF NEURONS IN MIDDLE TEMPORAL VISUAL AREA OF THE MACAQUE MONKEY .2. BINOCULAR INTERACTIONS AND SENSITIVITY TO BINOCULAR DISPARITY
FUNCTIONAL-PROPERTIES OF NEURONS IN MIDDLE TEMPORAL VISUAL AREA OF THE MACAQUE MONKEY .2. BINOCULAR INTERACTIONS AND SENSITIVITY TO BINOCULAR DISPARITY
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DOI：
10.1152/jn.1983.49.5.1148
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发表时间：
1983-01-01
影响因子：
2.5
通讯作者：
VANESSEN, DC
中科院分区：
文献类型：
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作者：
MAUNSELL, JHR;VANESSEN, DC
对5只猕猴的中颞叶视觉区（MT）进行电生理记录。使用计算机驱动的刺激器独立激活每只眼睛来检查双眼视力和视差选择性。从91个MT单个单元获得结果。MT中的大多数单元从两只眼睛接收大约平衡的输入，极少数单元只能通过一只眼睛驱动。在一种视差选择性测试中，使用具有不同但固定的水平视差的刺激来检查单元，从而模拟与动物不同距离的前沿平行运动。大约2/3的固定视差选择性测试单元（52/76）对水平视差表现出明显的敏感性。这些单元中的大多数可以被归为与之前在猕猴V1和V2中描述的相同的4类差异调谐单元：近、远、调谐兴奋和调谐抑制。测试了20个单位对垂直刺激差异的敏感性，这通常不会导致立体视觉。大多数人对垂直差距和水平差距同样敏感。单元还测试了对随着变化的视差移动的刺激的选择性，模拟了带有向动物或远离动物运动成分的轨迹（深度运动）。没有发现任何单位对深度运动具有真正的选择性。调整为固定视差的单元，如果只在其共同中心点远离单元最佳固定视差的轨迹上进行测试，则会表现出更喜欢深度运动。这并不被认为代表了深度运动的真正选择性，因为响应是充分的，更容易用固定视差的选择性来解释，这些单元的最佳总体响应是在最佳固定视差下进行正面平行运动。这一观察结果对深度选择性运动的解释具有重要意义。MT中对固定视差具有相当程度的选择性，加上先前证明的方向和速度选择性，表明MT非常适合于分析三维空间中的运动。
Electrophysiological recordings were made in the middle temporal visual area (MT) of 5 macaque monkeys. Binocularity and selectivity for disparity were examined using a computer-driven stimulator to activate each eye independently. Results were obtained from 91 single units in MT. Most units in MT receive approximately balanced inputs from the 2 eyes, and very few could be driven through only 1 eye. In 1 type of test for disparity selectivity, units were examined with stimuli that had different but fixed horizontal disparities, thereby simulating frontoparallel movements at different distances from the animal. About 2/3 of the units tested for fixed disparity selectivity (52/76) showed pronounced sensitivity to horizontal disparity. Most of these units could be grouped into the same 4 classes of disparity-tuned units that were previously described in V1 and V2 of the macaque: near, far, tuned excitatory and tuned inhibitory. Twenty units were tested for sensitivity to vertical stimulus disparity, which does not normally contribute to stereopsis. Most were as sensitive to vertical disparities as to horizontal. Units were also tested for selectivity for stimuli that moved with changing disparity, simulating trajectories with components of motion toward or away from the animal (motion in depth). No units were found to be truly selective for motion in depth. Units tuned for fixed disparity could appear to prefer motion in depth if tested only with trajectories whose common center point was far from the unit''s optimal fixed disparity. This is not considered this to represent genuine selectivity for motion in depth, since the responses are adequately and more easily explained in terms of selectivity for fixed disparity and the best overall response of these units is to frontoparallel motion at the optimal fixed disparity. This observation bears importantly on the interpretation of motion in depth selectivity. The presence of a substantial degree of selectivity for fixed disparity in MT, together with previously demonstrated selectivities for direction and speed, indicates that MT is well suited for the analysis of motion in 3-dimensional space.