Successful overshadowing and blocking in hippocampectomized rats

P. Garrud*, J. N.P. Rawlins, N. J. Mackintosh, G. Goodall, M. M. Cotton, J. Feldon

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


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.

Original languageEnglish
Pages (from-to)39-53
Number of pages15
JournalBehavioural Brain Research
Issue number1
StatePublished - Apr 1984


  • blocking
  • conditioned suppression
  • hippocampus
  • overshadowing
  • rat


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