Frequency 3D mapping and inter-channel stability of EEG intrinsic function pulsation: Indicators towards autism spectrum diagnosis

Autism spectrum is one of the serious disorders influencing mental capacities and hence behavior. The present work investigates the potential of detecting irregularities of EEG activity and connectivity in Autism Spectrum by studying the inter-channel stability of EEG components point-by-point pulsation as well as by frequency 3D mapping. First, Empirical Mode Decomposition is used to find the Intrinsic Mode Functions of every EEG channel. Second, the Phase derivatives of analytic intrinsic modes are then calculated. Third, each phase derivative function obtained for an intrinsic mode is plotted versus the phase derivative function of the counterpart intrinsic mode in another channel. Finally, the stability loops found out are then analyzed. Furthermore, 3D mapping of EEG frequency bands (Delta, Theta, Alpha and Beta) is conducted and examined.