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.
Vertical lines indicate phase changes, the horizontal line indicates indifference between the two altrnatives (50%), and the solid horizontal line indicates sessions where the left response key intermittently malfunctioned.
