I have a question of the P300 copy mode.
I am trying using the special command "Backspace" in the P300 copy mode. I found that the subject can use "Backspace" to correct the errors many times for the characters in the middle of the target phrase. However, the subject can't use "Backspace" to correct the error if the he/she spelled the last target character incorrectly.
For example, if the target phrase is "GREAT", the subject can correct any errors if he/she made any mistake in spelling "G", "R", "E" and "A". But the subject could not correct the error of the last character "T". When the set of intensification of "T" finishes, the P300 Speller will end automatically with a message "Time Out" on the screen.
Since I want to use the "Backspace" to correct the errors in the whole spelling process, is there any way to control the running time of the P300 Speller Copy Mode? Thanks.
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