Abstract
The light-avoidance behavior of normal rats and rats with primary visual system lesions was examined in a differentially illuminated two-choice chamber over 28-58 days. Light avoidance in normal rats was distributed as a J curve, with some rats spending little time in the light and some rats spending up to 12 h each day in the light. Normal rats ate in the dark compartment, hoarded food to the dark, but defecated in the lighted compartment. Enucleation abolished light avoidance and the other behaviors. Neither small nor large posterior neocortex lesions affected light avoidance or other behaviors. Avoidance behavior was also unchanged following superior colliculus lesions and pretectal lesions, but was increased by lateral geniculate lesions, posterior thalamus lesions or combined posterior neocortex and hippocampal lesions, and posterior neocortex and superior colliculus lesions. The results do not support previous suggestions that primary optic-center lesions decrease light avoidance in the rat.
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