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.
Stimuli to assess stereothresholds. One frame of two identical half images of (a) 0.07%, (b) 0.92%, and (c) 28.3% density 171 arc minutes X 171 arc minutes RDSs, presented side-by-side on the laptop monitor, with a superimposed line segment. In the experiment, the contrast of the RDs and the line segments shown in each panel were adjusted to the same multiple of the observers’ contrast detection thresholds.
