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.
The bubbles are arranged along the two dimensions of spatial gap (no gap at the left, a gap at the right) and temporal delay (none at the bottom, a delay at the top). The distal & delayed animation was the S+. See text for additional details.
