[FieldTrip] baseline_normalization

Eelke Spaak eelke.spaak at donders.ru.nl
Mon Nov 12 11:24:42 CET 2012

Dear Ivan,

Yes, you are correct. I think "relative change of spectral power"
covers what the formula means quite well.


On 12 November 2012 11:16, Ivan Chakalov <chakalov.ivan at googlemail.com> wrote:
> Dear Fieldtrippers,
> I have question regarding the baseline normalization using Time Frequency
> Analyses on a sensor space-level. I have used “Hanning tapper “for analyzing
> MEG data with “relchange” (relative change) baseline-normalization. So far I
> have no idea how to report the obtained results in terms of units or
> dimensions?  Should it be called “relative change of the spectral power”? As
> I understood, if Pa is the spectral power of the post-rigger time-period and
> Pb is the spectral power of the pre-trigger period, the “relchange” value is
> calculated as: Pa-Pb/Pb
> Am I correct?
> Thank you in advanced!
> Ivan Chakalov
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