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.
Surround suppression stimuli. Subjects indicated whether they perceived a difference in contrast between any one segment (target) and the other segments in the annulus under three conditions: A, NS; B, PS; and C, OS. The annulus is identical in all three conditions in this figure.
