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  • Title: Free-operant performance on variable interval schedules with a linear feedback loop: no evidence for molar sensitivities in rats.
    Author: Reed P, Soh M, Hildebrandt T, DeJongh J, Shek WY.
    Journal: J Exp Psychol Anim Behav Process; 2000 Oct; 26(4):416-27. PubMed ID: 11056882.
    Abstract:
    Four experiments examined rats' sensitivity to molar and molecular factors on instrumental schedules of reinforcement. Rats were exposed to a variable interval schedule with a positive feedback loop (VI+), such that faster responding led to a shorter interreinforcement interval. In Experiments 1 and 2, rats responded faster on a variable response (VR) schedule than on either a VI schedule matched for reinforcement rate or a VI+ schedule matched for the feedback function. In Experiment 3, rats responded no differently on a VI schedule than they did on a VI+ schedule with equated rates of reinforcement. In Experiment 4, rats responded faster on a VI+ schedule with an interresponse time requirement yoked to that experienced on a VR schedule, than on a VI+ schedule with the same feedback function as the VR schedule. Taken together these results suggest that rats are more sensitive to the molecular than the molar properties of the schedules.
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