Purchase the Surface Effective Connectivity add-on to generate Raw and Z Scored Surface Phase Slope Index bitmaps and tab-delimited-text files.
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The amplitude of higher EEG frequencies (e.g., beta) are related to the phase of lower EEG frequencies (e.g., theta). Therefore, this is a surface EEG measure of the correlation between the phase and amplitude of the EEG across frequencies and scalp locations, for example delta and beta or theta and alpha-2 or theta and high beta (Gamma), etc. This is a unique and important metric that in part reflects the coupling between the upper cortical layers (I-III that generate beta) and the lower cortical layers (V-VI) that generate delta and theta. This add-on quantifies the coupling and provides a normative database comparison (Z scores) to help link symptoms to dysregulation in the brain.
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Surface Cross-Frequency Power is an EEG measure of the correlation of power between frequencies and scalp locations, for example delta and beta or theta and alpha-2 or theta and high beta (Gamma), etc. A given brain region communicates with other brain region over a range of frequencies. Currently available for Raw Values Only.
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Surface Cross-Frequency Coherence is an EEG measure of the Coherence (amplitude independent coupling) between frequencies and scalp locations, for example delta & beta or theta & alpha-2 or theta & high beta (Gamma), etc. A given brain region communicates with other brain regions over a range of frequencies. This add-on quantifies the coupling and provides a normative database comparison (Z scores) to help link symptoms to dysregulation in the brain.
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The Bi-Spectral analyses includes: Spectrum of the Time Series of Instantaneous Power; Spectrum of the Time Series Relative Power; Spectrum of the Time Series of Instantaneous Coherence; Spectrum of the Time Series of Instantaneous Phase Differences; Spectrum of the Time Series of Instantaneous Amplitude Differences; Spectrum of the Time Series of Phase Reset; and Cross-Frequency Power Correlation (1Hz to 50 Hz).