Abstract
Pigeons responded to concurrent variable-interval variable-interval schedules of food reinforcement. Interchangeover times and reinforcements were recorded in intact time series during acquisition following several schedule-density manipulations. Probability of a changeover, while constant as a function of time since the previous changeover, was found to be a nonmonotonically increasing function of time since reinforcement. Autocorrelation analyses of intact time series revealed the presence of statistically significant sequential dependencies in the time series during acquisition, but not during asymptotic performance. Lag transformations of actual interchangeover times revealed inhomogeneities in the time series not shown in the autocorrelations or in the overall distribution of interchangeover times.
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