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The relationship between stereotypy and memory improvement produced by amphetamine

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Abstract

This study examined the possibility that amphetamine-induced stereotypy and facilitation of memory consolidation are both mediated by amphetamine's stimulation of dopaminergic activity in the caudate nucleus. In the first experiment, rats were given pairings of a tone and a shock followed by SC amphetamine (2 mg/kg). The amount of stereotypy and increased locomotor activity produced by the injection were measured immediately. Retention of the tone-shock association was evaluated 48 h later by observing the ability of the tone to suppress drinking. The degree of retention was significantly correlated with the amount of stereotypy but not with the amount of locomotion previously measured. In the second experiment, amphetamine was microinjected into the caudate nucleus (10 μg/μl) and its ability to produce the same three behavioral effects was examined. These injections produced increased stereotypy and improved retention, but no increase in locomotion. The correlation of memory facilitation with stereotypy and the fact that both were produced by intracaudate amphetamine suggest that they may be mediated by the same neuropharmacological substrate, namely amphetamine-induced release of dopamine in the caudate.

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Authors and Affiliations

  1. Department of Psychology, McGill University, 1205 Docteur Penfield Ave., H3A 1B1, Montreal, Quebec, Canada

    Geoffrey D. Carr & Norman M. White

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  1. Geoffrey D. Carr
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  2. Norman M. White
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Carr, G.D., White, N.M. The relationship between stereotypy and memory improvement produced by amphetamine. Psychopharmacology 82, 203–209 (1984). https://doi.org/10.1007/BF00427774

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  • DOI: https://doi.org/10.1007/BF00427774

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