Four women pressed a button in five two-component concurrent variable-ratio variable-ratio (conc VR VR) schedules of monetary reinforcement. There was no consistent tendency towards “probability matching” (distribution of responses between the two components in proportion to the relative probabilities of reinforcement); three of the four subjects showed exclusive preference for the schedule associated with the higher probability of reinforcement. These results are similar to results previously obtained with pigeons and rats in concurrent VR VR schedules.
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