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.
Participants saw two symbols on the screen, and selected one with a button press. If no response was made within 2 s, they were shown a ‘GO’ prompt. Feedback was determined probabilistically, was shown for 2 s, and was either the smiling or frowning face.
