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Learn Mem. 2005 Nov-Dec;12(6):557-63. Epub 2005 Nov 14.

Cholinergic septo-hippocampal innervation is required for trace eyeblink classical conditioning.

Author information

1
División de Neurociencias, Universidad Pablo de Olavide de Sevilla, 41013-Sevilla, Spain.

Abstract

We studied the effects of a selective lesion in rats, with 192-IgG-saporin, of the cholinergic neurons located in the medial septum/diagonal band (MSDB) complex on the acquisition of classical and instrumental conditioning paradigms. The MSDB lesion induced a marked deficit in the acquisition, but not in the retrieval, of eyeblink classical conditioning using a trace paradigm. Such a deficit was task-selective, as lesioned rats were able to acquire a fixed-interval operant conditioning as controls, and was not due to nonspecific motor alterations, because spontaneous locomotion and blink reflexes were not disturbed by the MSDB lesion. The deficit in the acquisition of a trace eyeblink classical conditioning was reverted by the systemic administration of carbachol, a nonselective cholinergic muscarinic agonist, but not by lobeline, a nicotinic agonist. These results suggest a key role of muscarinic denervation on the acquisition of new motor abilities using trace classical conditioning procedures. It might also be suggested that muscarinic agents would be useful for the amelioration of some associative learning deficits observed at early stages in patients with Alzheimer's disease.

PMID:
16287719
PMCID:
PMC1356172
DOI:
10.1101/lm.28105
[Indexed for MEDLINE]
Free PMC Article

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