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Chemical Senses Advance Access originally published online on November 16, 2006
Chemical Senses 2007 32(1):105-109; doi:10.1093/chemse/bjj045
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© The Author 2006. Published by Oxford University Press. All rights reserved. For permissions, please e-mail: journals.permissions@oxfordjournals.org

Brain Regions Responsible for the Expression of Conditioned Taste Aversion in Rats

Takashi Yamamoto

Department of Behavioral Physiology, Graduate School of Human Sciences, Osaka University, 1-2 Yamadaoka, Suita, Osaka 565-0871, Japan

Correspondence to be sent to: Takashi Yamamoto, Department of Behavioral Physiology, Graduate School of Human Sciences, Osaka University, 1-2 Yamadaoka, Suita, Osaka, 565-0871, Japan. e-mail: yamamoto{at}hus.osaka-u.ac.jp


  Abstract

Conditioned taste aversion (CTA) is acquired when the ingestion of a food is followed by malaise. CTA is a kind of fear learning making animals avoid subsequent intake of the food and show aversive behavior to the taste of the food. To elucidate the brain regions responsible for the expression of CTA, our previous electrophysiological and recent c-fos immunohistochemical studies have been reviewed. Among a variety of brain regions including the parabrachial nucleus, amygdala, insular cortex, supramammillary nucleus, nucleus accumbens, and ventral pallidum that are involved in different phases of CTA expression, the enhanced taste sensitivity to facilitate detection of the conditioned stimulus may originate in the central nucleus of the amygdala and the hedonic shift, from positive to negative, may originate in the basolateral nucleus of the amygdala.

Key words: amygdala, basolateral nucleus, c-fos, electrophysiology, parabrachial nucleus, reward system


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