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Torres, L. Valencia; Araujo, S. da Costa; Sanchez, C. M. Olarte; Body, S.; Bradshaw, C. M.; Szabadi, E. – Journal of the Experimental Analysis of Behavior, 2011
Twelve rats made repeated choices on an adjusting-delay schedule between a smaller reinforcer (A) that was delivered immediately after a response and a larger reinforcer (B) that was delivered after a delay which increased or decreased by 20% depending on the subject's choices in successive blocks of trials. In two phases of the experiment (100…
Descriptors: Animals, Selection, Reinforcement, Time
Rodewald, Andrew M.; Hughes, Christine E.; Pitts, Raymond C. – Journal of the Experimental Analysis of Behavior, 2010
Four pigeons were exposed to a concurrent procedure similar to that used by Davison, Baum, and colleagues (e.g., Davison & Baum, 2000, 2006) in which seven components were arranged in a mixed schedule, and each programmed a different left:right reinforcer ratio (1:27, 1:9, 1:3, 1:1, 3:1, 9:1, 27:1). Components within each session were presented…
Descriptors: Behavioral Science Research, Animals, Animal Behavior, Reinforcement
Kangas, Brian D.; Berry, Meredith S.; Branch, Marc N. – Journal of the Experimental Analysis of Behavior, 2011
Despite its frequent use to assess effects of environmental and pharmacological variables on short-term memory, little is known about the development of delayed matching-to-sample (DMTS) performance. This study was designed to examine the dimensions and dynamics of DMTS performance development over a long period of exposure to provide a more…
Descriptors: Short Term Memory, Stimuli, Memory, Intervals
Kyonka, Elizabeth G. E.; Grace, Randolph C. – Journal of the Experimental Analysis of Behavior, 2008
Pigeons responded in a concurrent-chains procedure in which terminal-link reinforcer variables were changed unpredictably across sessions. In Experiment 1, the terminal-link schedules were fixed-interval (FI) 8 s and FI 16 s, and the reinforcer magnitudes were 2 s and 4 s. In Experiment 2 the probability of reinforcement (100% or 50%) was varied…
Descriptors: Preferences, Reinforcement, Change, Responses
Mazur, James E. – Journal of the Experimental Analysis of Behavior, 2005
In Experiment 1 with rats, a left lever press led to a 5-s delay and then a possible reinforcer. A right lever press led to an adjusting delay and then a certain reinforcer. This delay was adjusted over trials to estimate an indifference point, or a delay at which the two alternatives were chosen about equally often. Indifference points increased…
Descriptors: Probability, Reinforcement, Responses, Intervals