Successful overshadowing and blocking in hippocampectomized rats.

Journal article

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.

Authors: Garrud, P; Rawlins, J; Mackintosh, N; Goodall, G; Cotton, M

• Publication status: Published
• Journal: Behavioural brain research
• Volume: 12
• Issue: 1
• Pages: 39-53
• Publication date: 1984-04-01
• DOI: 10.1016/0166-4328(84)90201-8
• EISSN: 1872-7549
• ISSN: 0166-4328
• Language: English
• Keywords: Cerebral Cortex; Association Learning; Attention; Rats, Inbred Strains; Rats; Conditioning (Psychology); Male; Animals; Discrimination Learning; Hippocampus; Corpus Callosum; Learning