[FieldTrip] Negative values of debiased wPLI

Ramin Azodi raminazodiaval at gmail.com
Mon Jan 20 19:58:53 CET 2014


I a bit confused about result which I got from debiased wPLI, because it
has the negative value inside the 'wpli_debiasedspctrm'. As I searched for
that I found this strange explanation,

"...We therefore estimated the squared wPLI by using the debiased wPLI
estimator (Vinck et al., 2011), ranging from zero *(negative values can
incidentally occur because of limited sampling)* to one (maximum

Beta coherence within human ventromedial prefrontal cortex precedes
value choices, N. Lipsman  et al, NeuroImage 85 (2014) 769–778.

Could someone explain me, what it means and what should I do with these
negative values?

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