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.
Responses during extinction. A, Mean ± SEM responses to the green key during the extinction session made by AP-5-treated (solid columns), lesioned (hatched columns), and vehicle-treated (open columns) pigeons. B, Means ± SEM values for the pre/post response ratio to the green (solid bars) and red (hatched bars) keys, respectively.
