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    A fast statistical significance test for baseline correction and comparative analysis in phase locking.

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    A fast statist...pdf (1.994Mb)  Published version
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    Attribution 4.0 International
    Date Issued
    2013
    Related DOI
    10.3389/fninf.2013.00003
    Author
    Rana, Kunjan D.
    Vaina, Lucia Maria
    Hämäläinen, Matti
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    Permanent Link
    https://hdl.handle.net/2144/18664
    Citation
    Rana KD, Vaina LM and Hämäläinen MS (2013) A fast statistical significance test for baseline correction and comparative analysis in phase locking. Front. Neuroinform. 7:3. doi: 10.3389/fninf.2013.00003
    Abstract
    Human perception, cognition, and action are supported by a complex network of interconnected brain regions. There is an increasing interest in measuring and characterizing these networks as a function of time and frequency, and inter-areal phase locking is often used to reveal these networks. This measure assesses the consistency of phase angles between the electrophysiological activity in two areas at a specific time and frequency. Non-invasively, the signals from which phase locking is computed can be measured with magnetoencephalography (MEG) and electroencephalography (EEG). However, due to the lack of spatial specificity of reconstructed source signals in MEG and EEG, inter-areal phase locking may be confounded by false positives resulting from crosstalk. Traditional phase locking estimates assume that no phase locking exists when the distribution of phase angles is uniform. However, this conjecture is not true when crosstalk is present. We propose a novel method to improve the reliability of the phase-locking measure by sampling phase angles from a baseline, such as from a prestimulus period or from resting-state data, and by contrasting this distribution against one observed during the time period of interest.
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    Attribution 4.0 International
    This Document is Protected by copyright and was first published by Frontiers. All rights reserved. it is reproduced with permission.
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