How can I distinguish between two similar EEG signals? I have two EEG signals that are very similar. The difference is only in amplitudes. However, they are coming from two different cognitive processes. What are some methods, beside FFT, for distinguishing between two very similar signals in terms of statistical information? Please let me know. Thank you

BSS.
yet another thing to try could be wavelet transform. Wavelets are powerful tools for analysis of signal. You could take a DWT of your signal and compare may be the most significant coefficients. Anyway but it would be helpful if you could post some sample data.