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.
Screen display used for the P300 speller in this study. The word to be spelled is displayed in the top left, with the current target character in parentheses. Rows and columns are flashed in random order prior to character selection. If feedback is desired, the selected choice is displayed below the intended target after character selection has been made.
