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 ideal observer discriminates between preferred- and null-direction motion better in response to narrow bar. Narrow and wide bars with 20% contrast were presented at velocities from 25 μm/s to 6,400 μm/s. Responses from On-Off DSGCs (n = 5) were recorded extracellularly. Discrimination between preferred and null direction is shown for Off (top) and On (bottom) responses. Dashed line shows 68% discrimination threshold.
