title: Within-session responding as a function of force required for lever press.
abstract: Four male Sprague-Dawley rats pressed a lever for food reinforcers delivered by a multiple variable interval 1-min variable interval 1-min schedule. Components alternated every 5 min. The force required to move the lever was 0.25, 0.15, 1.10, 0.75, and 0.50 N in different conditions. Changes in the force requirement did not alter the within-session pattern of responding. These results are consistent with other experiments suggesting that muscle warm-up and fatigue are not sufficient explanations for the within-session pattern of responding.
authors.affiliation: Department of Psychology, McNeese State University, Lake Charles, LA 70609, USA.
authors.forename: C L
authors.initials: CL
authors.lastname: Melville
authors.forename: L R
authors.initials: LR
authors.lastname: Rybiski
authors.forename: B
authors.initials: B
authors.lastname: Kamrani