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.
Left column: model time-series representative of (a) alert, eyes-open, (b) relaxed, eyes-closed, (c) sleep-stage 2 and (d) sleep-stage 4. Right column: corresponding time-series from human subjects (Nunez 1995). Note that the vertical normalizations differ between the two columns.
