Abstract
We argue in this paper for the inclusion in the primary emotional systems enumerated by Panksepp of a neural system that organises disgust responses. The DISGUST system arose phylogenetically in response to danger to the internal milieu from pathogens and their toxic products. We suggest that the primitive emotive circuit, which originally provided defence by regulating consummatory behaviours, gave rise to a primary emotional system that facilitates evaluation of reinforcers. Unlike the sensory affect of distaste from which it is experimentally dissociable, disgust responses can involve flexible learned components triggered by several modalities. The anterior insula is implicated as playing a major role in the DISGUST system both in organising disgust responses in the individual and recognising disgust responses in others.
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