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.
Mean performance across subjects for each of the three task conditions, gap closure (Exp 1, filled circles), time-to-contact (Exp 2, filled squares) and time-to-passage (Exp 3, filled diamonds). Error bars correspond to s.e.m. across subjects.
