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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 …