Role of daily reward sequences on S- discrimination contrasts in rats.

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Abstract
Conducted 3 experiments to examine the role of within-day sequences of large (L) and small (S) reward in S- negative contrast effects (NCEs) in differential conditioning of naive albino rats. Exp. I demonstrated an NCE for 2 groups receiving LLSS or LSSL sequences, respectively, but not for an SSLL group. Correlated startboxes were used as prestart cues. Exp. II used 2 trials/day in regular and irregular sequences, and demonstrated the necessity of at least occasional L-S transitions in producing an S- NCE. Exp. III supported these findings using 3 trials/day. These combined results are interpreted as requiring a revision of extant notions of expectancy. (17 ref.) (PsycINFO Database Record (c) 2006 APA, all rights reserved)

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