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.
Mean percentage correct on quizzes for students who played the review game and participated in the attention control. Weekly group performance is displayed in the top panel. Individual performance in each condition is displayed in the bottom panel. Error bars represent the range of quiz scores.
