Abstract
Rats previously trained on a successive brightness discrimination—go left in the presence of two black cards and go right in the presence of two white cards—sustained bilateral lesions to one of nine brain regions (parietal cortex, anterior cingulate cortex, posterior cingulate cortex, cerebellum, anterior thalamus, ventromedial thalamus, ventrolateral thalamus, lateral thalamus, and ventrobasal thalamus) thought to be concerned with the maintenance of habits having a proprioceptive-kinesthetic basis. The retention test disclosed that each of the nine brain-damaged groups showed significant deficits in the performance of the successive problem. Damage to the motor cortex, hippocampus, septofornix, or medial longitudinal fasciculus also led to significant retention deficits, but mammillary body or mediodorsal thalamic lesions had no effect. These findings suggest that left-right differentiation has a proprioceptive-kinesthetic basis in addition to a possible vestibular basis.
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