FUNCTIONAL-PROPERTIES OF NEURONS IN MIDDLE TEMPORAL VISUAL AREA OF THE MACAQUE MONKEY .1. SELECTIVITY FOR STIMULUS DIRECTION, SPEED, AND ORIENTATION
FUNCTIONAL-PROPERTIES OF NEURONS IN MIDDLE TEMPORAL VISUAL AREA OF THE MACAQUE MONKEY .1. SELECTIVITY FOR STIMULUS DIRECTION, SPEED, AND ORIENTATION
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DOI：
10.1152/jn.1983.49.5.1127
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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
记录来自麻醉的麻痹猕猴的中颞视觉区（MT）的单个单位。用计算机驱动的刺激器对刺激方向、速度和方向的选择性进行定量测试。数据取自组织学鉴定为MT的168个单位。背景以上的反应，刺激移动在一个单位的首选方向是，平均而言，10.9倍，刺激移动在相反的方向。附近的单位有一个明显的倾向，有类似的首选方向。大多数单位也急剧调整刺激运动的速度。对于某些细胞的反应下降到不到一半的速度只有2个因素的最佳;平均而言，反应大于半最大只有超过7.7倍的速度范围。不同单元的优选速度的分布是单峰的，峰值接近32 °/s。s;首选速度的总范围从2扩展到256 °/ S.附近的单位通常对类似的运动速度反应最好。MT中的大多数单位表现出选择性的刺激方向时，测试与固定，闪烁的酒吧。静止的刺激一般只引起短暂的反应，当平均超过刺激的持续时间，反应远小于移动刺激。首选的方向通常是，但不总是，垂直于首选的运动方向。本研究的结果与以前的定量调查的猫头鹰猴的比较显示了惊人的相似性，在MT的2个物种的响应特性。猕猴MT的方向和速度选择性的存在表明，这一领域是更专门的视觉运动的分析比以前认识到的。
Recordings were made from single units in the middle temporal visual area (MT) of anesthetized, paralyzed macaque monkeys. A computer-driven stimulator was used to make quantitative tests of selectivity for stimulus direction, speed and orientation. The data were taken from 168 units that were histologically identified as being in MT. The response above background to stimuli moving in a unit''s preferred direction was, on average, 10.9 times that to stimuli moving in the opposite direction. There was a marked tendency for nearby units to have similar preferred directions. Most units were also sharply tuned for the speed of stimulus motion. For some cells the response fell to less than half-maximal at speeds only a factor of 2 from the optimum; on average, responses were grater than half-maximal only over a 7.7-fold range of speed. The distribution of preferred speeds for different units was unimodal, with a peak near 32.degree./s; the total range of preferred speeds extended from 2-256.degree./s. Nearby units generally responded best to similar speeds of motion. Most units in MT showed selectivity for stimulus orientation when tested with stationary, flashed bars. Stationary stimuli generally elicited only brief responses; when averaged over the duration of the stimulus, the responses were much less than those to moving stimuli. The preferred orientation was usually, but not always, perpendicular to the preferred direction of movement. A comparison of the results of this study with a previous quantitative investigation in the owl monkey shows a striking similarity in response properties in MT of the 2 spp. The presence of both direction and speed selectivity in MT of the macaque suggests that this area is more specialized for the analysis of visual motion than was previously recognized.