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ISSN : 1226-9654

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Vol.11 No.1

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Electrolytic lesions of anterior cingulate cortex facilitate extinction of conditioned fear in rats

The Korean Journal of Cognitive and Biological Psychology / The Korean Journal of Cognitive and Biological Psychology, (P)1226-9654; (E)2733-466X
1999, v.11 no.1, pp.31-44
Younghwa Yoon (Korea Neuropsychological Research Institute, Dept. of Psychology, Korea University)
Yoon, Y. (1999). Electrolytic lesions of anterior cingulate cortex facilitate extinction of conditioned fear in rats. The Korean Journal of Cognitive and Biological Psychology, 11(1), 31-44.

Abstract

This study investigated the role of anterior cingulate cortex (Acc: Brodman area 24) in the fear conditioning in rats using Pavlovian conditioning paradigm. Conditioned fear (freezing responses) was measured during both the acquisition and the extinction phases of the task. Conditioned fear was measured both at the conditioned stimulus (CS) and at contextual stimuli during both phases. Acc lesions attenuated conditioned fear to contextual stimuli but not to CS during acquisition. Acc lesions prompted extinction to both contextual stimuli and CS. These results show that Acc lesions facilitate extinction of conditioned fear to context and CS and decrease conditioned fear of context and suggest that Acc may be involved in the acquisition of conditioned fear to contextual stimuli, and in the inhibition of extinction of conditioned fear both to contextual stimuli and to CS.

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The Korean Journal of Cognitive and Biological Psychology

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