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Document Type

Article

Abstract

Two groups of rats were trained to press the lever in a serial
feature-ambiguous (FA) task. A feature stimulus (X) signaled
reinforcement during one target stimulus that was otherwise
nonreinforced (a feature-positive or FP discrimination component),
but X signaled nonreinforcement during another target stimulus
that was otherwise reinforced (a feature-negative or FN
discrimination component). Two different reinforcers, pellets and
sucrose solution, were employed for the FP and FN components
in a differential outcomes group, whereas they were randomly
chosen for the FP and FN components in a mixed outcomes
group. The differential group showed better discrimination
performance than the mixed group. Implications for underlying
mechanisms of the DOE in general and of conditioned modulation
are discussed.

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