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Within-Session Changes In The Vi Response Function: Separating Food Density From Elapsed Session Time, James Dougan, Laura Campbell
Within-Session Changes In The Vi Response Function: Separating Food Density From Elapsed Session Time, James Dougan, Laura Campbell
Scholarship
Previous studies examining the relationship between response rate and reinforcement rate on variable- interval schedules (the variable-interval response function) have confounded elapsed session time with within-session changes in food density. The present experiments attempted to manipulate these factors independently and thus isolate their effects on responding. In Experiment 1, 7 rats pressed a bar for food on a series of four variable-interval schedules (7.5 s, 15 s, 30 s, and 480 s). Elapsed session time was held constant while food density was manipulated via a presession feeding. Changes in food density altered the form of the variable-interval response function, independently …
Session Duration And The Vi Response Function: With-In Session Prospective And Retrospective Efffects, James Dougan, Alfred Kuh, K. Vink
Session Duration And The Vi Response Function: With-In Session Prospective And Retrospective Efffects, James Dougan, Alfred Kuh, K. Vink
Scholarship
Two experiments examined the effects of session duration on responding during simple variable-interval schedules. In Experiment 1, rats were exposed to a series of simple variable-interval schedules differing in both session duration (10 min or 30 min) and scheduled reinforcement rate (7.5 s,15 s, 30 s, and 480 s). The functions relating response rate to reinforcement rate were predominantly monotonic for the short (10-min) sessions but were predominantly bitonic for the long (30-min) sessions, when data from the entire session were considered. Examination of responding within sessions suggested that differences in the whole-session data were produced by a combination of …
Behavioral Contrast In Competitive And Non-Competitive Environments, James Dougan, Frances Mcsweeney, Valeri Farmer-Dougan
Behavioral Contrast In Competitive And Non-Competitive Environments, James Dougan, Frances Mcsweeney, Valeri Farmer-Dougan
Scholarship
Three experiments examined the effects of opportunities for an alternative response (drinking) on positive behavioral contrast of rats' food-reinforced bar pressing. In both Experiments I and 2 the baseline multiple variable-interval schedules were rich (variable interval 10-s), and contrast was examined both with and without a water bottle present. In Experiment 1, the rats were not water deprived. When one component of the multiple schedule was changed to extinction, the rate of bar pressing increased in the constant component (positive behavioral contrast). The magnitude of contrast was larger when the bottle was absent than when it was present, as predicted …
Some Parameters Of Behavioral Contrast And Allocation Of Interim Behavior In Rats, James Dougan, Frances Mcsweeney, Valeri Farmer
Some Parameters Of Behavioral Contrast And Allocation Of Interim Behavior In Rats, James Dougan, Frances Mcsweeney, Valeri Farmer
Scholarship
Two experiments examined the effects of baseline reinforcement rate and component duration on behavioral contrast and on re-allocation of interim behavior in rats. Positive behavioral contrast occurred during multiple variable-interval 10-second extinction (VI 10 EXT) after a multiple VI 10 VI 10 baseline condition, but not during multiple VI 60 EXT following multiple VI 60 VI 60 baseline. Component duration had no significant effect on contrast. These results differed from those found in studies of pigeons' key pecking. Contrast was accompanied by an increased rate of drinking in the changed component, but drinking in the constant component did not decrease. …