Abstract
In Experiment 1, groups were given a trial sequence in differential conditioning in which all S+ trials preceded all S− trials (+− schedule) or one in which some S+ trials followed S− trials (+−+ schedule) and either a 1- or a 30-min intertrial interval (ITI). ITI affected discrimination learning only in the +− schedule condition; schedule affected discrimination only at massed trials. In Experiment.2, all groups received a +−+ schedule. In two groups, given a 1- or 15-min ITI between all trials, discrimination learning was independent of ITI. Discrimination learning was facilitated in two other groups given a 1-min ITI between all trials except between S− and the subsequent S+ trial, when the ITI was either 15 or 60 min. The results were discussed in terms of their implications for internal reward-related stimulus control of behavior in differential conditioning.
Published Version
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