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 stimuli of different contrasts
(A) Catch stimulus.
(B) Low contrast stimulus (RGB contrasts: 30/225).
(C) High contrast stimulus (RGB contrasts:40/215).
(D) Maximum contrast stimulus (RGB contrasts:100/155). Adapted from Di Gregorio et al. (2022).
