title: An application of the active time model to multiple concurrent variable-interval schedules.
abstract: The current experiment investigates whether an active time model can account for anomalous results that have emerged from multiple schedule, concurrent variable-interval (VI) VI experiments. The model assumes that (1) during concurrent VI VI training pigeons learn a function that relates time since the most immediate response, i.e., active time, to changeover probabilities and (2) that molar preference is the result of an interaction between inter-response time frequencies and the learned active time changeover functions. Pigeons were trained under a concurrent VI 30-s VI 30-s schedule and a concurrent VI 60-s VI 60-s schedule. Probes were conducted in which VI 30-s and VI 60-s stimuli were paired. During these probes, birds allocated choices equally to the stimuli. The active time model accurately fit individual subject data. In contrast data were not fit by a variant of scalar expectancy theory proposed by Gibbon [Gibbon, J., 1995. Dynamics of time matching: arousal makes better seem worse. Psychon. Bull. Rev. 2, 208-215].
authors.affiliation: Vassar College, Poughkeepsie, NY 12603, USA.
authors.forename: Emily Kathryn
authors.initials: EK
authors.lastname: Brown
authors.forename: J Mark
authors.initials: JM
authors.lastname: Cleaveland
mesh_terms: D000818:Animals; D010856:Columbidae; D003216:Conditioning, Operant / Q000502:physiology*; D003627:Data Interpretation, Statistical; D008960:Models, Psychological; D012055:Reinforcement Schedule; D013997:Time Factors