| Abstract: | In Exp I, 24 intact male Lister rats were given either lactose or sucrose solutions. Although on 1st exposure they readily consumed lactose, its ingestion produced a conditioned taste avoidance (CTA) that was partly extinguished by repeated sucrose exposure after lactose conditioning. In Exp II, 8 Ss with large bilateral electrolytic lesions of the basolateral amygdala and 10 with either sham or no operations were given 2 pairings of saline with LiCl injections (upper gastrointestinal tract discomfort) and, in a separate condition, access to high levels of lactose (lower gastrointestinal tract discomfort). CTAs were measured both by 2-bottle tests and by video recordings of orofacial and somatic responses. The lesions attenuated LiCl-induced but not lactose-induced CTA, results demonstrating that a CTA can occur without the basolateral amygdala. Findings suggest that aversions based on distaste can be distinguished from avoidances based on danger, not only in terms of orofacial responses but also in terms of their neuroanatomical substrate. (31 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved) |
