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.
Accuracy by item type, task and age group: a) accuracy in the which-N task with digits; b) accuracy in the which-More task with digits; c) accuracy in the which-N task with dots; d) accuracy in the which-More task with dots. The gray dotted line represents the chance level.
