RECEPTIVE-FIELD PROPERTIES OF NEURONS IN AREA V3 OF MACAQUE MONKEY EXTRASTRIATE CORTEX
RECEPTIVE-FIELD PROPERTIES OF NEURONS IN AREA V3 OF MACAQUE MONKEY EXTRASTRIATE CORTEX
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DOI：
10.1152/jn.1987.57.4.889
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发表时间：
1987-04-01
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：
FELLEMAN, DJ;VANESSEN, DC
在麻醉猕猴的半时记录过程中，观察了147个经组织学证实位于V3区神经元的感受野特性。定量分析神经元对方向、方向、速度、双眼视差和颜色的选择性。V3区多数神经元(76%)具有较强的方向选择性；40%的神经元表现出较强的方向选择性。大多数细胞对刺激速度进行了调节，几乎一半的细胞在16度/S时表现出最佳反应。最佳速度的分布主要在4度到32度/S之间。V3中的几个细胞显示出多峰的方位和/或方向调节曲线。这些细胞有两个或更多不同轴的窄调峰。在某些方面，它们类似于猫区19的高级超复杂细胞，可能有助于比之前的视觉区域更高水平的形态或运动分析。大约一半(45%)的细胞对双眼视差有选择性。其中大约一半是兴奋的，因为当仅通过任一只眼睛测试时，它们显示出弱的反应，但显示出以注视平面为中心的强大的双眼促进作用。其他视差选择细胞在固定平面前后的反应被调谐、抑制或不对称。与以前的报道相反，V3中大约20%的神经元对颜色具有选择性，对最好的单色波长的反应是最差的几倍。平均而言，颜色选择细胞子集的颜色调谐曲线在80-100 nm的半最大响应处具有全带宽。V3区神经元的感受场特性与视皮层其他区域的神经元感受场特性的比较表明，V3区与MT一样，非常适合于分析刺激运动的几个方面。V3也可能参与形态分析的某些方面，特别是在低对比度水平。与Vp区相比，以前被认为是V3部分的腹侧V2前的一条薄条皮质表明，V3区比Vp区更具方向选择性。反之，颜色选择细胞在VP中占多数，而在V3中占少数。这表明视觉信息在上视野和下视野中的处理方式不同。
Receptive field properties of 147 neurons histologically verified to be located in area V3 were investigated during semichronic recording from paralyzed anesthetized macaque monkeys. Quantitative analyses were made of neuron selectivities for direction, orientation, speed, binocular disparity, and color. The majority of neurons in V3 (76%) were strongly orientation selective; 40% demonstrated strong direction selectivity. Most cells were tuned for stimulus speed and almost half showed optimum responses at 16 degrees/s. The distribution of optimum speeds ranged primarily from 4 to 32 degrees/s. Several cells in V3 displayed multi-peaked orientation- and/or direction-tuning curves. These cells had two or more narrowly tuned peaks that were not co-axial. In some ways, they resemble higher-order hypercomplex cells of cat area 19 and may subserve a higher level of form or motion analysis than is seen at antecedent visual areas. Roughly half (45%) of the cells were selective for binocular disparity. Approximately half of these were tuned excitatory in that they showed weak responses when tested through either eye alone, but showed strong binocular facilitation centered on the fixation plane. The other disparity-selective cells were tuned inhibitory or asymmetric in their responses in front and behind the fixation plane. Contrary to previous reports, approximately 20% of the neurons in V3 were color selective in terms of showing a severalfold greater response to the best monochromatic wavelength compared with the worst. Color-tuning curves of the subset of color selective cells had, on average, a full bandwidth at half maximum response of 80-100 nm. A comparison of the receptive field properties of neurons in V3 to those in other areas of visual cortex suggests that V3, like MT, is well suited for the analysis of several aspects of stimulus motion. V3 may also be involved in some aspects of form analysis, particularly at low contrast levels. Comparison with area VP, a thin strip of cortex anterior to ventral V2, which was previously considered part of V3, indicates that direction selectivity is much more prevalent in V3 than in VP. Conversely, color-selective cells are the majority in VP but a minority in V3. This suggests that visual information is processed differently in the upper and lower visual fields.