5 rats were trained on a free-operant avoidance schedule R-S = 20 min., S-S = 5 min., 3 with a response-produced stimulus and 2 without. As tested by avoidance extinction (shock removal) the response-produced stimulus had no conditioned reinforcing properties in those Ss trained without this response-produced stimulus. Ss trained with the response-produced stimulus did not show negatively accelerated response rates in the first extinction period when this stimulus was delivered. This conditioned reinforcing effect was of short durability.
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