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Bi-phase locking - a tool for probing non-linear interaction in the human brain.

Abstract：

:We present a novel method for detecting frequency-frequency coupling between the electrical output of cortical areas as measured by electrocorticography (ECoG), electroencephalography (EEG) and magnetoencephalography (MEG), the biphase-locking value (bPLV). Our method is an extension of the well known phase-locking value (PLV) and is specifically sensitive to non-linear interactions, i.e. quadratic phase coupling across frequencies. Due to its sensitivity to non-linear interactions, it is robust to spurious synchronization arising from linear crosstalk, which is an especially useful property when analyzing data recorded by EEG/MEG. We discuss the statistical properties of the bPLV, specifically the distribution of the bPLV under assumption of random phases between the signals of interest. We also compare the bPLV to the PLV for cortical interactions that are computed for simulated EEG/MEG data. These data were mapped to the cortex using an inverse solution. We demonstrate our method for event related ECoG data recorded from the motor cortex of an epileptic patient, who performed a cued finger movement task. We find highly significant, movement related increase of the bPLV between the alpha (12 Hz) and high gamma (77 Hz) band in a pre-motor area, coupling to high gamma at 89 Hz in the motor cortex.

journal_name

Neuroimage

journal_title

NeuroImage

authors

Darvas F,Ojemann JG,Sorensen LB

doi

10.1016/j.neuroimage.2009.01.034

subject

Has Abstract

pub_date

2009-05-15 00:00:00

pages

123-32

issue

1

eissn

1053-8119

issn

1095-9572

pii

S1053-8119(09)00094-9

journal_volume

46

pub_type

杂志文章

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