Dose-dependent impairing effects of morphine on avoidance acquisition and performance in male mice.

Abstract:

:The effects of morphine (6.3, 12.6, and 25.2 mg/kg) on active avoidance behavior of BALB/C mice are explored in three acquisition sessions and in two subsequent performance sessions. Morphine-treated animals showed an increase in avoidance acquisition with respect to control group without differences in performance. However, a dramatical, concomitant rise in the locomotor activity of the animals (increase in the number of crossings during the intertrial intervals) prompted us to transform the data employing a formula with which a measure of actual learning was obtained. Applying this formula, we have observed that morphine administration impairs, dose-dependently, acquisition and performance of avoidance. Thus, the impairing effects of morphine on avoidance could be masked by their stimulant effects on locomotor activity.

journal_name

Neurobiol Learn Mem

authors

Aguilar MA,Miñarro J,Simón VM

doi

10.1006/nlme.1997.3804

subject

Has Abstract

pub_date

1998-03-01 00:00:00

pages

92-105

issue

2

eissn

1074-7427

issn

1095-9564

pii

S1074-7427(97)93804-1

journal_volume

69

pub_type

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