EEG Data Plotting - Power Spectrum, Spectrogram, Frequency spectrum of alpha, beta, delta and theta

An electroencephalogram (EEG) detect electrical activity in brain using electrode attached to scalp.

This submission contains an exercise problem of plotting EEG Data, Power spectrum using FFT and Pwelch method, FDA tool box - Spectrogram, Frequency Spectrum of Alpha, Beta, Theta and Delta.
Reference: [ ] John L.Semmlow. Biosignal and Medical Image Processing. 2nd edition, CRC Press, 2009