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.
(A) Sequential display with 70% of figures colored dark blue. In the original computer display, the dark figures were dark blue and the lighter ones were bright yellow. Participants were asked to guess what proportion were colored blue; the screen faded to gray after 10 s. (B) Random arrangement of same quantity.
