info:eu-repo/semantics/article
Posttrial corticosterone administration enhances the effects of incentive downshift: Exploring the boundaries of this effect
Fecha
2009-12Registro en:
Ruetti, Eliana Martha; Justel, Nadia; Mustaca, Alba Elisabeth; Papini, Mauricio Roberto; Posttrial corticosterone administration enhances the effects of incentive downshift: Exploring the boundaries of this effect; American Psychological Association; Behavioral Neuroscience.; 123; 1; 12-2009; 137-144
0735-7044
CONICET Digital
CONICET
Autor
Ruetti, Eliana Martha
Justel, Nadia
Mustaca, Alba Elisabeth
Papini, Mauricio Roberto
Resumen
Posttrial administration of corticosterone was previously shown to enhance consummatory successive negative contrast (cSNC) in rats. The present series of experiments provides additional information that helps determine the boundaries of this effect. Posttrial corticosterone administration (1) enhances cSNC when rats experience a large downshift (32% to 4% sucrose), but not after a small downshift (8% to 4% sucrose; Experiment 1); (2) has no effect in an anticipatory negative contrast situation in which 4% sucrose precedes 32% sucrose in daily trials (Experiment 2); (3) does not support the development of a conditioned taste aversion to 4% sucrose, in the absence of an incentive downshift (Experiment 3); and (4) facilitates the extinction of consummatory behavior (Experiment 4). These results suggest that corticosterone facilitates the encoding of an egocentric aversive memory of the incentive downshift experience.