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.
Experiment 1. (A) Design. (B) Conditioned freezing behavior during extinction, retention test and retest, by group. Extinction results in reduced fear expression at test in the AAA, AAB and ABB groups but not in the ABA group. (C) The min-by-min pattern of freezing during the 15-min exposure to A or B (extinction session). Data are expressed as means (+/- SEM in panel C), in panel B symbols represent individual data points.
