Differential effects of posterior thalamic lesions of retention of various visual habits

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2 experiments are reported on the effects of pretectal diencephalic (nucleus-posterior thalami) lesions on retention of 3 different visual discrimination habits in rats. In Experiment 1 these lesions were found to have a significantly greater effect on a simultaneous brightness discrimination than on a simultaneous form discrimination. Increasing the difficulty of the brightness habit did not exaggerate the retention loss produced by such lesions. In Experiment 2 partial destruction of the nucleus posterior in rats lacking the striate cortex significantly interfered with the retention of a brightness discrimination. Partial damage to the superior colliculus, however, had no effect. (20 ref.) (PsycINFO Database Record (c) 2006 APA, all rights reserved)

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