VISUAL PROPERTIES OF NEURONS IN AREA V4 OF THE MACAQUE - SENSITIVITY TO STIMULUS FORM
VISUAL PROPERTIES OF NEURONS IN AREA V4 OF THE MACAQUE - SENSITIVITY TO STIMULUS FORM
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DOI：
10.1152/jn.1987.57.3.835
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发表时间：
1987-03-01
影响因子：
2.5
通讯作者：
SCHEIN, SJ
中科院分区：
文献类型：
--
作者：
DESIMONE, R;SCHEIN, SJ
V4区是猕猴纹前皮层中的一个视觉组织区域，是下颞叶皮层视觉输入的主要来源，已知对物体识别至关重要。为了研究V4细胞对刺激形式的选择性，我们定量测量了322个细胞对长度、宽度、方向和对比度极性不同的条形和空间频率、相位、方向和整体大小不同的正弦光栅的反应。V4中记录的所有细胞都位于月前回的下部。感受野几乎完全位于下视野中央5度的代表内，感受野的线性尺寸比相应的纹状体皮质（V1）的代表大4-7倍。几乎所有的感受野都由重叠的暗区和亮区组成，就像V1中的“经典”复杂野一样，但暗区和亮区的相对强度往往不同。少数细胞只对光或暗刺激作出反应。V4中的许多细胞对刺激方向有选择性，少数细胞对运动方向也有选择性。尽管取向选择性细胞的中值取向带宽（52度）比V1中取向细胞所报告的更宽，但约8%的取向细胞的带宽小于30度，这几乎与V1中最窄调谐的细胞一样窄。选择运动方向的细胞比例（13%）与V1中报告的无显著差异。绝大多数的V4细胞被调谐到条形的长度和宽度，并且最佳条形的“形状”因细胞而异，如已经报道的猫头鹰猴的背外侧视觉区（DL）中的细胞，猕猴中的V4的可能同源物。优选的长度和宽度独立地从大约0.05度到6度变化，最小的优选条大约是V1中最小感受野的大小，最大的优选条大于V1中的任何野。最佳条的大小和感受野的大小之间的关系因细胞而异。例如，一些细胞对比场窄得多或短得多的条反应最好，而另一些细胞对在长度、宽度或两个维度上填充（但不延伸超出）兴奋性场的条反应最好。（400字处截断摘要）
Area V4, a visuotopically organized area in prestriate cortex of the macaque, is the major source of visual input to the inferior temporal cortex, known to be crucial for object recognition. To examine the selectivity of cells in V4 for stimulus form, we quantitatively measured the responses of 322 cells to bars varying in length, width, orientation, and polarity of contrast, and sinusoidal gratings varying in spatial frequency, phase, orientation, and overall size. All of the cells recorded in V4 were located on the lower portion of the prelunate gyrus. Receptive fields were located almost exclusively within the representation of the central 5 degrees of the lower visual field, and receptive field size, in linear dimension, was 4-7 times greater than that in the corresponding representation of striate cortex (V1). Nearly all receptive fields consisted of overlapping dark and light zones, like “classic” complex fields in V1, but the relative strengths of the dark and light zones often differed. A few cells responded exclusively to light or dark stimuli. Many cells in V4 were selective for stimulus orientation, and a few were selective for direction of motion as well. Although the median orientation bandwidth of the orientation-selective cells (52 degrees) was wider than that reported for oriented cells in V1, approximately 8% of the oriented cells had bandwidths of less than 30 degrees, which is nearly as narrow as the most narrowly tuned cells in V1. The proportion of cells selective for direction of motion (13%) was not markedly different from that reported in V1. The large majority of V4 cells were tuned to the length and width of bars, and the “shape” of the optimal bar varied from cell to cell, as has been reported for cells in the dorsolateral visual area (DL) of the owl monkey, a possible homologue of V4 in the macaque. Preferred lengths and widths varied independently from approximately 0.05 to 6 degrees, with the smallest preferred bars about the size of the smallest receptive fields in V1 and the largest preferred bars larger than any fields in V1. The relationship between the size of the optimal bar and the size of the receptive field varied from cell to cell. Some cells, for example, responded best to bars much narrower or shorter than the field, whereas other cells responded best to bars that filled (but did not extend beyond) the excitatory field in the length, width, or both dimensions.(ABSTRACT TRUNCATED AT 400 WORDS)