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.
A representative example of hemodynamic signals from one subject during the cognitive task for oxygenated (HbO, top) and deoxygenated (Hb, bottom) hemoglobin. Onset of the task is marked by t = 0. Note a smaller amplitude scale for Hb responses.
