X-CELL AND Y-CELL IN THE LATERAL GENICULATE-NUCLEUS OF MACAQUE MONKEYS
X-CELL AND Y-CELL IN THE LATERAL GENICULATE-NUCLEUS OF MACAQUE MONKEYS
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DOI：
10.1113/jphysiol.1982.sp014333
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发表时间：
1982-01-01
影响因子：
5.5
通讯作者：
SHAPLEY, RM
中科院分区：
文献类型：
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作者：
KAPLAN, E;SHAPLEY, RM
根据视觉诱发神经信号的空间叠加，将猕猴外侧膝状体核（lgn）细胞分为2个功能群。如果细胞对精细正弦光栅的对比度反转的响应处于基本时间调制频率，并且零位置距离峰值响应的位置四分之一周期，则细胞被称为X细胞。如果细胞对这种刺激的反应是调制频率的两倍，并且几乎不依赖于空间相位，则称为Y细胞。在lgn的4个背侧小细胞层中的细胞中，99%是X细胞;腹侧2个大细胞层中75%的细胞也是X细胞。剩下的是Y细胞。证实了以前的研究结果，即大细胞有一个较短的反应潜伏期电刺激视交叉。大细胞比小细胞具有更高的对比敏感度。猕猴lgn中存在两种不同类型的X细胞：小细胞X细胞和大细胞X细胞。它们在性质上的巨大差异表明它们在视觉中具有不同的功能。大细胞层中的Y细胞形成第三功能群，其空间特性明显不同于X细胞。显然，猕猴lgn的大细胞层可能与猫lgn的A和A1层同源。
Cells of the lateral geniculate nucleus (lgn) in macaque monkeys were sorted into 2 functional groups on the basis of spatial summation of visually evoked neural signals. Cells were called X cells if their responses to contrast reversal of fine sine gratings were at the fundamental temporal modulation frequency with null positons one quarter of a cycle away from positions for peak response. Cells were called Y cells if their responses to such stimuli were at twice the modulation frequency and were approximately independent of spatial phase. Of the cells in the 4 dorsal parvocellular layers of the lgn, 99% were X cells; .apprx. 75% of the cells in the 2 ventral magnocellular layers were also X cells. The remainder were Y cells. Previous findings that magnocellular cells had a shorter latency of response to electrical stimulation of the optic chiasm were confirmed. Magnocellular cells had much higher contrast sensitivities than did parvocellular cells. Two distinct classes of X cells exist in the macaque lgn: parvocellular X cells and magnocellular X cells. The great difference in their properties suggests that they have different functions in vision. The Y cells in the magnocellular layers form a 3rd functional group with spatial properties distinctly different from the X cells. Evidently, the magnocellular layers of the macaque monkey lgn may be homologous to the A and A1 layers of the cat lgn.