Facilitation of discrimination transfers under amphetamine: the relative control by S+ and S- and general transfer effects.

Abstract:

:Rats were trained in a Y-maze on a two-choice simultaneous black-white discrimination with either black or white as S+. Animals were then transferred to one of three discrimination tasks. In task 1 (New S-), a new stimulus, either vertical or horizontal stripes, was substituted for the original S-. In task 2 (New S+), a new stimulus, either vertical or horizontal stripes as in task 1, was substituted for the original S+. In task 3 (New S+/S-) animals were trained on horizontal-vertical discrimination. The pre-trial administration of 1 mg/kg d-amphetamine facilitated the acquisition of the original black-white discrimination with both black as S+ and white as S+. Likewise, the drug improved performance in all three transfer conditions. However, the course of learning in the three transfer tasks was different in the placebo- and amphetamine-treated animals. Amphetamine-treated animals were disrupted more by a change in S+ than by a change in S-, whereas the opposite pattern was evident in the placebo controls. When both discriminative stimuli were changed, placebo animals exhibited pronounced decrement in performance, whereas amphetamine animals exhibited excellent learning. The implications of these findings for the effects of amphetamine on discrimination learning are discussed.

journal_title

Psychopharmacology

authors

Weiner I,Feldon J,Ben-Horin E

doi

10.1007/BF00179945

subject

Has Abstract

pub_date

1987-01-01 00:00:00

pages

261-7

issue

2

eissn

0033-3158

issn

1432-2072

journal_volume

93

pub_type

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