[FieldTrip] wPLI and analysis of band frequencies

Eliana Garcia elilife at gmail.com
Fri Feb 10 16:26:46 CET 2012


I am currently trying to analyze my data using the wPLI. However I would
like to do a band frequency analysis i.e calculate a wPLI value for example
for the beta band, but this is not possible since  the wPLI is calculated
for a time window (according to the time-frequency transformation
resolution) and for a certain specific frequency across trials. Guggisberg
et al ('Mapping functional connectivity in  Patients with Brain lesions')
solved this problem in the case of coherence, calculating the sum of
autospectra and sum of cross-spectra of the corresponding frequency bins.

However, I think that this approach will influence a lot false negatives in
the case of the wPLI, since the shifts of phases for the components of the
certain band can somehow cancel to each other.

Another idea could be to calculate the wPLI for each frequency bin and then
average across the band frequency, but I am not sure if this will be really
representative of functional connectivity for this band.

I still have no clue and what could be the best approach.

Thank you so much,

Eliana García Cossio
Applied Neurotechnology Lab.
Graduate School of Neural and Behavioral Science - Max Planck Research
Institute of Medical Psychology and Behavioral Neurobiology
Universität Tübingen
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