The Bi-Spectral Analyses Surface Database for a 2nd NeuroGuide License.
Dynamic Bi-Spectral Analyses for a 2nd NG License
Dynamic Bi-Spectral Analyses for a 2nd NeuroGuide License
There are two categories of Bi-Spectral analyses in NeuroGuide™. First is the spectral analyses of the time series of instantaneous absolute power, relative power, coherence, phase differences, amplitude asymmetry and phase reset (1st derivative of straightened phase). The first spectrum is the Hilbert transform of the EEG microvolt time series x(t) using Complex Demodulation to produce a new time series x'(t) of instantaneous power and magnitude and coherence and phase. The new time series is defined within frequency bands at specific center frequencies. The Bi-Spectrum is the Fourier transform of the Hilbert transformed time series from each electrode at each time point [(x'(t); y'(t) ….. n'(t)] to produce the instantaneous time series Bi-spectrum.
To activate this Bi-Spectral analysis click View > Dynamic Bi-Spectrum.
The second is the Cross-Frequency Bi-Spectrum which includes the cross-frequency power correlation (1 Hz to 50 Hz) and the Cross-Frequency Phase Shift Duration and the Cross-Frequency Phase Lock Duration.
To activate the Cross-Frequency Bi-Spectra click Analysis > Bi-Spectral Analysis.
The Bi-Spectral analyses are an add on product that 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
Cross-Frequency Power Correlation (1Hz to 50 Hz)
Cross-Frequency Phase Shift Duration (n:m phase synchrony)
Cross-Frequency Phase Lock Duration (n:m phase synchrony)