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).
Dynamic Bi-Spectral Analyses
$700.00
Description
Dynamic Bi-Spectral Analyses
There are two categories of Cross-Frequency analyses in NeuroGuide™. First is the “Bi-Spectrum” that uses the Hilbert transform to calculate the instantaneous amplitude “Envelope” of absolute power, absolute amplitude, coherence, phase differences, amplitude asymmetry and phase reset (1st derivative of straightened phase). Then the FFT is used to compute the spectrum of the “Envelope” that is plotted from 0.032 Hz to 5 Hz to cover the “Infra-Low”aspects of the human EEG. This frequency range corresponds to the frequency range of the fMRI as well as the use of DC EEG amplifiers. DC amplifiers are seriously limited by artifact, e.g., the metal-to-scalp electrical exchange rather than the EEG. The Bi-Spectrum avoids such artifact and instead measures the cross-frequency oscillations for a range of different metrics.
To activate the Cross-Frequency Bi-Spectra click View > Dynamic Bi-Spectral Analysis.
The Bi-Spectral analyses are an add on product that includes:
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Spectrum of the Time Series of Instantaneous Absolute Power
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Spectrum of the Time Series of Instantaneous Absolute Amplitude
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Spectrum of the Time Series of Instantaneous Coherence
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Spectrum of the Time Series of Instantaneous Phase Differences
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Spectrum of the Time Series of Instantaneous Amplitude Differences
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Spectrum of the Time Series of Phase Reset
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Cross-Frequency Power Correlation (0.032 Hz to 5.0 Hz)
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Cross-Frequency Phase Shift Duration (n:m phase synchrony)
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Cross-Frequency Phase Lock Duration (n:m phase synchrony)
