Abstract

Four groups of rats underwent fear conditioning or control procedures prior to shuttle-box training. The four groups in the first part of the experiment received either inescapable signal-shock pairings, unpaired presentations of signal and shock, signal presentations only, or signal-shock pairings in which shock could be terminated by escape response. The result of the subsequent avoidance training demonstrated that animals which received the inescapable signal-shock pairings performed significantly better than the other three groups.

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