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.
Mean MR signal intensity in left thalamus for the healthy comparison (black circle) and bipolar (black square) groups across three successive 5-min vigilance periods corresponding to performance early, intermediate, and late in the 15-min vigil.
