Linked Life Data

11275294

Source:http://linkedlifedata.com/resource/pubmed/id/11275294

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
1-2
pubmed:dateCreated
2001-3-29
pubmed:abstractText
The present investigation was aimed at elucidating the dose and time dependency of scopolamine-induced recovery of inhibitory avoidance after its extinction. Two experiments were conducted: in the first, we analyzed the effects of four doses (1, 2, 4, and 8 mg/kg) of the musacrinic receptor antagonist scopolamine, on the expression of this conditioned response once it had been extinguished. Independent groups of rats were trained in a one-trial, step-through inhibitory avoidance task and submitted to daily retention (extinction) tests. After extinction had occurred, animals were injected intraperitoneally 10 min before retention testing, either with saline or scopolamine. Results show that scopolamine produced a dose-dependent recovery of the avoidance response. The second experiment was carried out in the same animals, which were now tested for retention of inhibitory avoidance at 1, 2, 3, 6, and 9 months after completion of the first experiment. All rats received counterbalanced injections of saline or scopolamine 10 min before testing at each time interval. Reliable recovery of the avoidance response was observed at the 1-month interval with a clear dose dependency while, after the second month, only the groups treated with the two higher doses continued responding. The results indicate that recovery of the extinguished response produced by muscarinic blockade follows dose- and time-dependent curves, and can be achieved long after a single training session. These data suggest that the inhibitory avoidance memory trace is retained in the brain after behavioural extinction of this response, thus supporting the view of extinction as new learning that affects the retrieval of the original memory, but does not modify its storage.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Jun
pubmed:issn
0166-4328
pubmed:author
pubmed:issnType
Print
pubmed:volume
121
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
173-9
pubmed:dateRevised
2011-11-17
pubmed:meshHeading
pubmed:year
2001
pubmed:articleTitle
Dose- and time-dependent scopolamine-induced recovery of an inhibitory avoidance response after its extinction in rats.
pubmed:affiliation
Departamento de Fisiología, Facultad de Medicina, Universidad Nacional Autónoma de México, P.O. Box 70-250, Mexico 04510 D.F., Mexico. roldan26@servidor.unam.mx
pubmed:publicationType
Journal Article