Erich Sutter more than 20 years ago developed an amazing EEG BCI system based on eye movements for ALS patients for whom eye movements were the only motor output available. The patient would foveate a rich screen of letters or words, each flickering with their own shifted pseudo-random orthogonal m-sequence.
<br><br>But without that foveation I don't know of any EEG based BCI system that gives more than about 1 bit per second. If anyone knows of such a system it would be good to post to this list.<br>Stan Klein<br><br><div>
<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"><div bgcolor="#ffffff" text="#000000">Another application area of interest to you might be: 'accessibility'
technology for the disabled. Several research projects have used
realtime spontaneous-EEG as part of a Brain Computer Interface or
'BCI'. Through watching two objects on a computer screen the subject
is asked to bring the two objects closer together (or farther apart).
Electrode site placement, eeg frequency bands of interest, and the
programming interface to the computer ... must all be provided to
complete the 'circuit'.<br>
<br>
EEG baselines must be obtained for 'normal' subjects in eyes-open,
eyes-closed, and in cognitive challenge or task performance. Measures
of ratios between power spectra across frequency bands or coherence of
eeg energy across regions of scalp - possibly reflecting underlying
neural source populations - are all topics and problems of enormous
potential.<br>
<br>
Dr. Timothy C. Aarset<br>
biomechanical engineer<br>
neuropsych lab brandeis univ<br>
</div>
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