期刊
JOURNAL OF NEUROPHYSIOLOGY
卷 90, 期 3, 页码 1852-1864出版社
AMER PHYSIOLOGICAL SOC
DOI: 10.1152/jn.00417.2003
关键词
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资金
- NEI NIH HHS [EY-05253] Funding Source: Medline
The Y pathway in the cat visual system is traditionally viewed as a single channel that originates in the retina. However, most Y cells from the contralateral retina diverge to innervate two different layers of the lateral geniculate nucleus, suggesting a possible channel split: Y C ( Y geniculate cell in layer C) and Y A ( Y geniculate cell in layer A). We tested the functional significance of this anatomical divergence by comparing the response properties of simultaneously recorded Y C and Y A geniculate cells with overlapping receptive fields. Our results demonstrate that Y C and Y A cells significantly differ in a large number of temporal and spatial parameters including response latency, response transiency, receptive-field size, and linearity of spatial summation. Furthermore, for some of these parameters, the differences between Y C and Y A cells are as pronounced as the differences between Y and X cells in layer A. These results along with results from previous studies strongly suggest that Y retinal afferents diverge into two separate channels at the level of the thalamus.
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