The conditioned eyeblink response: A role for the GABA-B receptor?

O. A. Ramirez, A. F. Nordholm, David Gellerman, J. K. Thompson, R. F. Thompson

Research output: Contribution to journalArticle

12 Scopus citations

Abstract

In well-trained animals, infusion of the GABA-B agonist baclofen into the cerebellar interpositus nucleus and overlying cortex abolished the conditioned response (CR) with no effect on the unconditioned response (UR) with doses at or above 5.0 mM. Infusion of the GABA-B antagonist CGP 5584-5A alone had no effect on the CR or UR. However, administration of 5 mM baclofen soon after infusion of CGP 5584-5A (15 min) resulted in no reduction of percent CR and only partial reduction of CR amplitude. Naive animals given interpositus infusions of baclofen during training showed no learning, yet learned normally in postinfusion training. The distribution of (radiolabelled) baclofen was localized and remained within the cerebellum. The results presented here are consistent with a growing body of literature supporting the hypothesis that the memory trace for eyeblink conditioning is formed and stored in the cerebellum and may involve GABAergic mechanisms.

Original languageEnglish (US)
Pages (from-to)127-132
Number of pages6
JournalPharmacology Biochemistry and Behavior
Volume58
Issue number1
DOIs
StatePublished - Sep 1 1997
Externally publishedYes

Keywords

  • Baclofen
  • Cerebellum
  • Eyeblink conditioning
  • GABA-B receptors
  • Interpositus nucleus

ASJC Scopus subject areas

  • Biochemistry
  • Toxicology
  • Pharmacology
  • Clinical Biochemistry
  • Biological Psychiatry
  • Behavioral Neuroscience

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