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.
Letters correspond to scene images in Figure 1. The 7-minute movie comprises four main scenes (c-f), with introductory and finale scenes (b and g). The movie begins and ends with five seconds during which a fixation cross is presented (a and h). Transparent boxes indicate transitional periods during which scenes are switching.
