Early development of X-cells in kitten lateral geniculate nucleus

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Science  14 Oct 1977:
Vol. 198, Issue 4313, pp. 202-204
DOI: 10.1126/science.905824


Lateral geniculate nucleus cells of the kitten were classified as X-cells or Y-cells with a contrast reversal test and their latencies to optic chiasm shock were measured. X-cells with mature latencies were found as early as 21 days. Y-cells did not have adult latencies at 40 days. The early development of some X-cells may be due to differential rates of fiber myelination and synaptic maturation within the lateral geniculate nucleus.

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