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.
Relationship between freezing behavior during fear extinction memory testing and REM sleep P-wave density during the postextinction training 6 h sleep—wake period. Note the inverse relationship (Spearman rank correlation) between postextinction training REM sleep P-wave density and freezing response during fear extinction memory testing, 24 h after training.
