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.
Note. Study duration refers to the average time in milliseconds spent studying each target. The circles represent mean study duration, and the error bars reflect plus or minus standard error. See the online article for the color version of this figure.
