Selected events initiated sessions of fixed-ratio 10 training for 3 rats. These events were eliminated during 14 extinction sessions. In the following 3 extinction sessions, the early session events occurred as secondary reinforcement after every tenth bar response. 2 Ss demonstrated response recovery. In the next 6 extinction sessions with the same 3 Ss, the early session events occurred after every fifth bar response. The response rate increased for all Ss. The results indicate that an extinguished response rate is sensitive to events associated with the start of the training session. These events suggest a possible explanation of the phenomenon of spontaneous recovery.
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