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.
Grand average waveforms of the contingent negative variation (CNV) at Fz, Cz, and Pz; S1 and S2 are the warning and stimulus onset times, respectively. Early CNV refers to the period 550–750 msec following presentation of the warning light (stimulus 1); late CNV refers to the period 200 msec prior to the onset of the Go/No‐Go cue for button press (stimulus 2).
