Abstract

A sequential IRT analysis was carried out on the response output of two rats on DRL 15 sec LH 5 sec. It was found that burst responding (1) did not occur after a reinforced response, (2) was more likely to follow a nonreinforced response if the latter was preceded by a reinforced response, (3) increased in probability after a nonreinforced response when the prior run of reinforced responses was greater than one, and (4) decreased in probability as the last successfully timed response became more remote. As reinforcement on this schedule is known to initiate a more precise temporal discrimination, it was hypothesized that these results might explain a previously reported finding that burst responding increases in probability as an IRT approaches the lower bound of the reinforcement interval.

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