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 …

In a discrete‐trials procedure with pigeons, a response on a green key led to a 4‐s delay
(during which green houselights were lit) and then a reinforcer might or might not be …

Previous studies of choice between two delayed reinforcers have indicated that the relative
immediacy of the reinforcer is a major determinant of the relative frequency of responding …

Pigeons chose between two alternatives that differed in the probability of reinforcement and
the delay to reinforcement. A peck on the red key always produced a delay of 5 s and then a …

Two experiments measured pigeons' choices between probabilistic reinforcers and certain
but delayed reinforcers. In Experiment 1, a peck on a red key led to a 5‐s delay and then a …

In Experiment 1, pigeons' pecks on a green key led to a 5‐s delay with green houselights,
and then food was delivered on 20%(or, in other conditions, 50%) of the trials. Pecks on a …

A discrete‐trials adjusting‐delay procedure was used to investigate the conditions under
which pigeons might show a preference for partial reinforcement over 100% reinforcement …

As many of the chapters in this volume illustrate, a host of procedures have been used to
study choice between delayed reinforcers. One dimension that helps to distinguish among …

An adjusting procedure was used to measure choices between fixed and variable delays
before reinforcement in 3 White Carneaux and 1 racing pigeon. The schedule of delays that …

In an adjusting‐delay choice procedure, pigeons could peck on either a red key or a green
key. A peck on the red key always led to a delay associated with red houselights and then …