Phasic and tonic cells in the cat's lateral geniculate nucleus.

FUKADA , Y. and SAITO, H. Phasic and Tonic Cells in the Cat's Lateral Geniculate Nucleus. Tohoku J. exp. Med., 1972, 106 (2),209-210 Relay neurons in the cat's lateral geniculate nucleus have either on-center or off-center receptive field. They are further classified into Type-I (phasic) and Type-‡U (tonic). Type-I cells are activated by faster conducting opfic tract fibers and send the visual information to visual cortex by faster conducting radiation fibers, while Type-‡U cells area ctivated by slower fibers and extend slower radiation fibers, while Type-‡U cells are activated by slower fibers and extend slower radiation fibers, while Type-‡U cells are activated by slower fibers and extend slower radiation fibers. cat's lateral geniculate nucleus; receptive field; discharge pattern; con duction velocity