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.
Group average time-frequency maps of phase locking. A, Midline frontal (Fz), central (Cz), and occipital (Oz) sites. The early evoked gamma band response (circled in yellow) can be distinguished from the low-frequency VEP. B, Square minus No-Square difference map at the left occipital site (O1).
