Experiments on single, multiple, and concurrent schedules of reinforcement find various
correlations between the rate of responding and the rate or magnitude of reinforcement. For …

Interval schedules of reinforcement maintained pigeons' key‐pecking in six experiments.
Each schedule was specified in terms of mean interval, which determined the maximum rate …

Frequency and magnitude of reinforcement were varied in concurrent variable‐interval
variable‐interval schedules of reinforcement. The relative response rate to the two stimuli …

Recent research on multiple schedule interactions is reviewed. Contrary to formulations that
view contrast as the result of elicited behavior controlled by the stimulus‐reinforcer …

In Experiment 1, matching of relative response rates to relative rates of reinforcement was
obtained in concurrent variable‐interval schedules when the absolute values of the two …

When a pigeon's pecks on two keys were reinforced concurrently by two independent
variable‐interval (VI) schedules, one for each key, the response rate on either key was given …

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 …

Pigeons chose between alternatives that differed in the number of reinforcers and in the
delay to each reinforcer. A peck on a red key produced the same consequences on every …

Two differences between ratio and interval performance are well known:(a) Higher rates
occur on ratio schedules, and (b) ratio schedules are unable to maintain responding at low …

Responding by pigeons on one key of a two‐key chamber alternated the color of the second
key, on which responding produced food according to a variable‐interval schedule of …