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 used in grouping experiments. Note that circles in actual displays were red and blue (indicated by light and dark greys, respectively). The observer's task was to determine as quickly and accurately as possible whether the two bars were of the same or different orientations. Stimuli in (a), but not (b), are considered grouped by similarity for neurotypical observers.
