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.
Visual degradation was realized by pixel displacement. From left to right, the figure shows examples of 0%, 10% and 20% of pixel displacements, that is, parafoveal previews with high to low salience.
