FIGURE 1.
Screenshot of the matrix version in which all the iterations were presented simultaneously. In the sequential version (not displayed here), only one iteration was presented at a time.
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.