EEG signal processing with wavelet or fft?
Here are links to the coding.  I am doing something else, so I have not dug into the code to see how the algorithms work.  If you need help analyzing the code set up a private &quot;room&quot; here and we can discuss it there.  I am sure that it requires more chit-chat than the hall monitors like here :)
a simple Processing application 
ARDUINO BRAIN LIBRARY
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Thanks for the lead!  I had an application for treating certain dementia problems using something like this but haven't followed up.