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.
Potential mechanisms for duration selectivity proposed by the following: Narins and Capranica, 1980 (A); Casseday et al., 1994, 2000; Covey et al., 1996; Ehrlich et al., 1997 (B); and Fuzessery and Hall, 1999 (C). For explanation, see Introduction.
