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.
Experimental design used in this study. Animals in the CS-only condition were presented with tones during fear conditioning in the absence of any footshock. Arrows under the boxes indicate the number of animals that were euthanized to assay c-Fos in the fear extinction circuit.
