Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Percent of reinforcers earned for staying, for all six birds in Experiment 4. Left (dark) bars represent the first five days of training. Middle (light) bars represent the second five days of training. Right (medium) bars represent the 30th and final day of training.
