Wavelets EEG

The Wavelets transform is used to perform a spectral analysis of EEG signals. Unlike the FFT,

which calculates the entire frequency spectrum for a given interval, the Wavelets transform

performs a local analysis of non-stationary signals in the time-frequency domain. Accordingly,

it provides simultaneously the frequency content of the signal in the vicinity of each time

point. You can use this transform to analyze short-lasting changes in the frequency spectrum

of the EEG signal over time.

FFT analysis cannot detect short-lasting spectral changes, because the FFT depicts the frequency

spectrum over a longer time interval.