Successful overshadowing and blocking in hippocampectomized rats
Identifieur interne : 00E042 ( Main/Exploration ); précédent : 00E041; suivant : 00E043Successful 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 :
- Behavioural Brain Research [ 0166-4328 ] ; 1984.
Descripteurs français
- Wicri :
- topic : Traitement de l'information.
English descriptors
- KwdEn :
- Anterior plane, Auditory stimuli, Behav, Behaviour rates, Behavioural, Bilateral, Bilateral neocortical damage, Cingulum bundle, Classical conditioning, Clicker, Compound conditioning, Compound trials, Conditioning, Conditioning trials, Control animals, Control condition, Control conditions, Control group, Control groups, Correlated, Correlated condition, Correlated control, Correlated group, Cortical, Cortical control, Cortical damage, Cortical group, Cresyl violet, Dentate gyrus, Different results, Dorsal, Dorsal hippocampus, Dorsal thalamus, Entorhinal, Experimental psychology, Experimental study, Extensive hippocampal damage, Extensive lesions, Final test trial, Good evidence, Hippocampal, Hippocampal animals, Hippocampal damage, Hippocampal flexure, Hippocampal formation, Hippocampal function, Hippocampal group, Hippocampal lesion group, Hippocampal lesions, Hippocampal rats, Hippocampally, Hippocampus, Information processing, Inhibitory conditioning, Intermediate plane, Latent inhibition, Lesion, Lesion group, Lesion groups, Lesioned, Lesioned animals, Less suppression, Lever press training, Main groups, More suppression, Much suppression, Neocortical, Neocortical damage, Nictitating membrane conditioning, Nictitating membrane response, Other element, Overall analysis, Pavlovian conditioning, Physiol, Physiological saline, Posterior plane, Psychol, Rat, Reinforcement, Replication, Results histology, Rickert, Salient condition, Same rate, Second experiment, Second group, Second replication, Sham, Sham controls, Sham operations, Shamoperated animals, Significant differences, Significant effect, Significant effects, Significant interaction, Significant interactions, Similar effects, Similar levels, Sodium pentobarbitone, Stimulus selection, Suppression, Suppression ratio, Suppression ratios, Temporal pole, Test trials, Third test days, Trace conditioning, Unconditioned suppression, Unilateral entorhinal, Uninformative stimuli, Various stages, Ventral, Ventral lesions, Visual group, Visual stimuli.
- Teeft :
- Anterior plane, Auditory stimuli, Behav, Behaviour rates, Behavioural, Bilateral, Bilateral neocortical damage, Cingulum bundle, Classical conditioning, Clicker, Compound conditioning, Compound trials, Conditioning, Conditioning trials, Control animals, Control condition, Control conditions, Control group, Control groups, Correlated, Correlated condition, Correlated control, Correlated group, Cortical, Cortical control, Cortical damage, Cortical group, Cresyl violet, Dentate gyrus, Different results, Dorsal, Dorsal hippocampus, Dorsal thalamus, Entorhinal, Experimental psychology, Experimental study, Extensive hippocampal damage, Extensive lesions, Final test trial, Good evidence, Hippocampal, Hippocampal animals, Hippocampal damage, Hippocampal flexure, Hippocampal formation, Hippocampal function, Hippocampal group, Hippocampal lesion group, Hippocampal lesions, Hippocampal rats, Hippocampally, Hippocampus, Information processing, Inhibitory conditioning, Intermediate plane, Latent inhibition, Lesion, Lesion group, Lesion groups, Lesioned, Lesioned animals, Less suppression, Lever press training, Main groups, More suppression, Much suppression, Neocortical, Neocortical damage, Nictitating membrane conditioning, Nictitating membrane response, Other element, Overall analysis, Pavlovian conditioning, Physiol, Physiological saline, Posterior plane, Psychol, Rat, Reinforcement, Replication, Results histology, Rickert, Salient condition, Same rate, Second experiment, Second group, Second replication, Sham, Sham controls, Sham operations, Shamoperated animals, Significant differences, Significant effect, Significant effects, Significant interaction, Significant interactions, Similar effects, Similar levels, Sodium pentobarbitone, Stimulus selection, Suppression, Suppression ratio, Suppression ratios, Temporal pole, Test trials, Third test days, Trace conditioning, Unconditioned suppression, Unilateral entorhinal, Uninformative stimuli, Various stages, Ventral, Ventral lesions, Visual group, Visual stimuli.
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:
- Australie, France, Israël, Royaume-Uni
- Angleterre, Angleterre de l'Est, Oxfordshire
- Cambridge, Oxford
- Université d'Oxford, Université de Cambridge
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Le document en format XML
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<term>Similar levels</term>
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<term>Test trials</term>
<term>Third test days</term>
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<term>Unconditioned suppression</term>
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<term>Uninformative stimuli</term>
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<front><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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