Figure 1.
Schematic view of the four electrode montages used here. The red rectangle is the active electrode(s), while the black rectangle is the reference one.
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.