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ISSN : 1226-9654

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The effect on processing of reinforcer of the amygdala and mesolimbic system in albino rat

The Korean Journal of Cognitive and Biological Psychology / The Korean Journal of Cognitive and Biological Psychology, (P)1226-9654; (E)2733-466X
1992, v.4, pp.58-69
Hyuck-Chel Kwon (Chonbuk National University)
Kwon, H. (1992). The effect on processing of reinforcer of the amygdala and mesolimbic system in albino rat. The Korean Journal of Cognitive and Biological Psychology, 4, 58-69.

Abstract

This study examined the effects of (1)amygdaloid lesion, (2)dopamine agonist injections and antagonist injections into the nucleus accumbens, and (3)these injection treatments after amygdaloid lesion on acquisition of passive avoidance task. Seventy two rats were assigned to six groups: (1)apomorphin injected, (2)haloperidol injected, (3)saline injected, (4)amygdala lesioned and apomorphin injected, (5)amygdala lesioned and haloperidol injected, (6)amygdala lesioned and saline injected. Performances of one-trial passive avoidance task using shuttle box were recorded by program made of C language. It was found that amygdaloid lesion impaired passive avoidance learning. Haloperidol injections into the nucleus accumbens impaired the performance but did not alter the effect of amygdaloid lesion. Apomorphin injections into the nucleus accumbens had no effect on the performance but it altered the effect of amygdaloid lesion. These results showed that amygdala is involved in the processing of negative reinforcer which is withdrawl of aversive stimulus. And it was partly supported that the input from amygdala was modulated by dopamin in nucleus accumbens.

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The Korean Journal of Cognitive and Biological Psychology

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