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Successful overshadowing and blocking in hippocampectomized rats

Identifieur interne : 00E042 ( Main/Exploration ); précédent : 00E041; suivant : 00E043

Successful overshadowing and blocking in hippocampectomized rats

Auteurs : P. Garrud [Royaume-Uni] ; J. N. P. Rawlins [Royaume-Uni] ; N. J. Mackintosh [Royaume-Uni] ; G. Goodall [France] ; M. M. Cotton [Australie] ; J. Feldon [Israël]

Source :

RBID : ISTEX:E48454EF171803F2944FF54E69CCE26AD8DFC1D9

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English descriptors

Abstract

Abstract: Overshadowing (Experiment 1) and blocking (Experiment 2) were investigated using a conditioned suppression paradigm in rats. Neither hippocampectomy nor cortical control lesions affected the extent to which a salient stimulus overshadowed a less salient one. Nor did the lesions affect the extent to which a stimulus that was highly correlated with shock overshadow a stimulus that was less well correlated with shock. Finally, the lesions did not alter the extent to which a previously reinforced stimulus blocked conditioning to another stimulus when both were presented as a reinforced compound stimulus. It is thus possible for hippocampectomized rats to show apparently normal overshadowing and blocking, at least under some testing conditions.

Url:
DOI: 10.1016/0166-4328(84)90201-8


Affiliations:


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Le document en format XML

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<div type="abstract" xml:lang="en">Abstract: Overshadowing (Experiment 1) and blocking (Experiment 2) were investigated using a conditioned suppression paradigm in rats. Neither hippocampectomy nor cortical control lesions affected the extent to which a salient stimulus overshadowed a less salient one. Nor did the lesions affect the extent to which a stimulus that was highly correlated with shock overshadow a stimulus that was less well correlated with shock. Finally, the lesions did not alter the extent to which a previously reinforced stimulus blocked conditioning to another stimulus when both were presented as a reinforced compound stimulus. It is thus possible for hippocampectomized rats to show apparently normal overshadowing and blocking, at least under some testing conditions.</div>
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