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.
Tasks presented to participants. (A) P300 speller interface. (B) RSVP task: T1 is the letter “U” (presented in green); T2 (X) follows T1 with no intervening distracter (lag 1). (C) CD baseline task: In the test array, one of the four items changes orientation. (D) Selection task of the CD task: the participant is asked to focus on the red items ignoring the blue items. In the test array, one of the four red items changes orientation.
