Neocortex and feeding behavior in the rat

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Consummatory behavior and weight-regulation capacity were measured in 12 normal male Long-Evans rats and in 43 similar Ss that survived complete (C), sequential unilateral (U), anterolateral (A), or posterior (P) neocortical ablations. Groups C and A displayed aphagia and adipsia followed by a sequence of recovery stages qualitatively identical to, but shorter than, recovery typically seen following lateral hypothalamic lesions. After recovery, Group C displayed long-term effects of finickiness and prandial drinking. These effects and a measure of recovery of body-weight-regulation capacity were significantly intercorrelated with lesion size, and body-weight set point remained significantly lower than normal. Group U was relatively unaffected by the 1st unilateral ablation and showed, relative to Group C, facilitated recovery of consummatory behaviors following the 2nd ablation, but displayed the long-term effects. Group P, though significantly affected by the lesion, did not display the pattern or intensity of effects described for the other bilaterally ablated groups. (47 ref) (PsycINFO Database Record (c) 2006 APA, all rights reserved)

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