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' responses in the presence of two concurrently available (initial‐link) stimuli
produced one of two different (terminal‐link) stimuli. The rate of reinforcement in the …

Five pigeons were trained in a concurrent‐chain procedure. In the initial links, equal
nonindependent variable‐interval schedules were available concurrently on two keys …

Pigeons were trained on a two‐key choice procedure in which a pair of equal and
concurrently available variable‐interval schedules (initial links) arranged entry into one or …

Pigeons were trained on a two‐link concurrent chain schedule in which responses on two
keys were reinforced according to independent variable‐interval schedules by the …

Pigeons performed on second‐order schedules of reinforcement consisting of four fixed‐
interval components. Only the terminal component ended with food. Performance was …

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 …

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 …

Three pigeons pecked for food on a synthetic variable‐interval schedule of reinforcement
that had two independent parts: a variable‐interval schedule that arranged a distribution of …

In a two‐link, concurrent‐chain schedule, pigeons' pecks on each key during the initial link
occasionally produced a terminal link, during which only that key was operative. Responses …