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.
Example stimulus sequence from the experimental task. The target stimuli were photographs of real-world scenes presented at the center of the screen. Subjects were tested on a randomly selected 10% of trials. In each test, four quadrants from four different images (one matching the immediately preceding scene, three selected at random from the other task scenes).
