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Two experiments were conducted to investigate the hypothesis that the medial frontal cortex and dorsomedial thalamus constitute a neural system mediating a common set of behaviors. Rats with bilateral medial frontal lesions, unilateral medial frontal lesions, bilateral medial thalamic lesions, unilateral medial thalamic lesions, contralateral medial frontal and medial thalamic lesions, and sham operations were compared on spontaneous alternation and visual-tactile discrimination. Only rats with bilateral medial thalamic lesions were found to be deficient on the two tasks. Thus, while the present experiments are consistent with earlier work demonstrating that a functional medial thalamus is necessary for normal spontaneous alternation and discrimination, the present experiments failed to support the notion that the medial thalamus and medial frontal cortex constitute a common behavioral system.

A comparison of the effects of medial frontal, dorsomedial thalamic, and combination lesions on discrimination and spontaneous alternation in the rat