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The effects of phencyclidine on latent inhibition in taste aversion conditioning: differential effects of preexposure and conditioning

Journal article
Authors Erik Pålsson
Daniel Klamer
Caroline Wass
Trevor Archer
Jörgen Engel
Lennart Svensson
Published in Behav Brain Res
Volume 157
Issue 1
Pages 139-46
Publication year 2005
Published at Department of Psychology
Institute of Physiology and Pharmacology, Dept of Pharmacology
Pages 139-46
Language en
Links www.ncbi.nlm.nih.gov/entrez/query.f...
Keywords Analysis of Variance, Animals, Avoidance Learning/*drug effects, Conditioning, Classical/*drug effects, Dextroamphetamine/pharmacology, Drug Administration Schedule, Enzyme Inhibitors/pharmacology, Hallucinogens/*administration & dosage, *Inhibition (Psychology), Injections, Subcutaneous, Male, NG-Nitroarginine Methyl Ester/pharmacology, Phencyclidine/*administration & dosage, Rats, Rats, Sprague-Dawley, Taste/drug effects
Subject categories Physiology

Abstract

Latent inhibition (LI) is a behavioural procedure in which preexposure to a stimulus not followed by reinforcement retards subsequent conditioning to this stimulus when it is paired with reinforcement. Changes in LI thus reflect greater or lesser retardation of learning which essentially implies a potentiation or an attenuation of the LI effect. LI has proved sensitive to psychotomimetic and antipsychotic treatment, which has encouraged its use to model learning and attention deficits in schizophrenia. In the present study, experiments were conducted to evaluate the effects of the psychotomimetic drug, phencyclidine (PCP, 2 mg/kg), and compare it with D-amphetamine (D-AMP, 0.33 and 1 mg/kg), on LI using a conditioned taste aversion procedure. PCP was found to potentiate LI when administered acutely prior to the conditioning trails, while no such effect was observed when administered prior to the preexposure trials. D-AMP, on the other hand, disrupted LI possibly due to a failure to induce a persistent taste aversion conditioning.

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