Pigeons were exposed to the concurrent‐chains procedure in two experiments designed to
investigate the effects of unequal numbers of reinforcers on choice. In Experiment 1, the …

Pigeons chose between equivalent two‐component mixed and multiple terminal‐link
schedules of reinforcement in the concurrent‐chains procedure. The pigeons preferred the …

Pigeons responded on concurrent‐chains schedules with equal variable‐interval schedules
as initial links. One terminal link delivered a single reinforcer after a fixed delay, and the …

Pigeons' responses in the presence of two concurrently available (initial‐link) stimuli
produced one of two different (terminal‐link) stimuli according to identical but independent …

Pigeons' choices between alternatives that provided different percentages of reinforcement
in mixed schedules were studied using the concurrent‐chains procedure. In Experiment 1 …

Six pigeons were trained in concurrent‐chain schedules with equal aperiodic initial links
and delays to reinforcers in the terminal links. The terminal links always lasted 30 s. In …

In concurrent, two‐member chains, the completion of one or the other of two initial
percentage fixed‐interval 90‐sec links produced a terminal link in which the completion of a …

A concurrent‐chains procedure was used to examine pigeons' preferences between
segmented and unsegmented terminal‐link schedules of reinforcement. During the initial …

Each of five pigeons was exposed to two or more durations of access to mixed grains on two‐
link, chained, interval schedules in which both links were identical fixed‐interval or variable …

Pigeons were trained on a two‐link concurrent chain schedule in which responding on
either of two keys in the initial link occasionally produced a terminal link, signaled by a …