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.
Examples of each stimulus display. A) Visual stimulus that targeted the M pathway (achromatic, lower spatial frequency, and higher temporal frequency (12 Hz). B) Visual stimuli that targeted the P pathway (lower luminance contrast, higher chromatic contrast, increased spatial frequency, alternating at 0.5 Hz).
