Abstract
Ninety-six male albino rats were trained to leverpress for sucrose on either a continuous reinforcement schedule (CRF) or a variable ratio schedule of reinforcement (VR). Following acquisition, a leverpress produced footshock followed by ECS for half of the subjects in each group. For the remaining subjects, a leverpress produced footshock only. All subjects were then tested in an extinction session either 4, 24, or 48 h after treatment. Results showed an insignificant PRE for subjects tested 4 or 24 h after treatment; however, when the ECS-test interval was increased to 48 h there was apparent spontaneous recovery of the PRE.
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