Extended training extinction effect under massed and spaced extinction trials.

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Abstract
The previously reported negative relationship between extent of acquisition and response speed during extinction on the straight runway when large numbers of training trials are used was investigated under markedly different extinction intertrial intervals. Two degrees of training, 60 or 190 trials, were factorially combined with 2 extinction intertrial intervals, 1 min. or 24 hr., and extinction was evaluated over 3 5-trial blocks separated by at least 48 hr. Results for the postrecovery speed measure showed that 190 acquisition trials led to faster extinction than 60 trials for both extinction intertrial intervals. Also, under massed extinction decrements within a 5-trial block decrease during extinction following 60 acquisition trials but increase following 190 trials.

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