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In the lateral geniculate nucleus of the mink, on-center and off-center neurons occupy separate layers [LeVay, S. &amp; McConnell, S.K. (1982) Nature (London) 300, 350-351]. To study the mode of termination of geniculate afferents in area 17, we recorded from their terminal arborizations in layer IV after the destruction of cortical neurons by injection of kainic acid. At the majority of recording sites, multifiber responses were entirely or predominantly of one type: on-center or off-center. Responses obtained during perpendicular penetrations showed the same preferred sign of contrast throughout the thickness of layer IV. During tangential penetrations through the layer, we encountered sequences of on- and off-center activity separated by stretches of mixed responses. We conclude that on- and off-center afferents terminate in separate, alternating patches that occupy the full thickness of layer IV. These coexist with another set of patches in which the same afferents are segregated by eye of origin.

Segregation of on- and off-center afferents in mink visual cortex.