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A Discrete-Trial Choice Procedure for Assessing the Periodic Equivalent of an Aperiodic Ratio Schedule

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Abstract

Various procedures used to evaluate preference between fixed- and variable-ratio schedules (Fr, Vr) of reinforcement have often yielded differing results with respect to the extent to which subjects will choose a Vr over an equal valued Fr schedule. A discrete-trial choice procedure, therefore, was employed in the present study in an attempt to derive a more sensitive measure of the Fr equivalent of various Vr schedules. Twelve rats were presented with choice trials consisting of various ratio values which were systematically varied across sessions according to the psychophysical method of limits. In all, the Fr equivalency measures obtained for the various Vr schedules were lower than the Vr value, demonstrating that given equal valued Vr and Fr schedules, the subjects preferred the Vr. The preference measures did vary as a function of intertriai interval (Iti) length, although the results were inconclusive. Initial response latencies (Irls) for the choice responses coincided well with overall preference measures, suggesting that they, too, could be used as a measure of preference. Also, Iti response measures were used to adjust the choice measures, indicating that such response biases as position preferences could be effectively corrected for within this type of procedure. In conclusion, the discrete-trial choice procedure as employed in psychophysics methodology holds promise for evolving a comprehensive means of evaluating operant choice.

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Authors and Affiliations

  1. Western Michigan University, USA

    Michael J. Boivin & Arthur G. Snapper

Authors
  1. Michael J. Boivin
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  2. Arthur G. Snapper
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Additional information

This study was completed by Michael J. Boivin in partial fulfillment of the doctoral degree at Western Michigan University. The authors would like to thank Drs. Jack Michael and David Lyon for their comments and helpful suggestions during the course of this study. Betty Videto, Pamela England, and Jody Miller devoted a great deal of time and effort towards the preparation of this manuscript, and their efforts are greatly appreciated. The authors would also like to thank Dr. Robert Cobez and Tom Pritzel for their assistance in maintaining the apparatus during the study.

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Boivin, M.J., Snapper, A.G. A Discrete-Trial Choice Procedure for Assessing the Periodic Equivalent of an Aperiodic Ratio Schedule. Psychol Rec 36, 257–283 (1986). https://doi.org/10.1007/BF03394945

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