[FieldTrip] baseline_normalization

[Gio Piantoni]

Hi Ivan,

If you multiply the values by 100, you get the "percentage change",
which is very straightforward to interpret.

Cheers,
G

On Mon, Nov 12, 2012 at 11:24 AM, Eelke Spaak <eelke.spaak at donders.ru.nl> wrote:
> Dear Ivan,
>
> Yes, you are correct. I think "relative change of spectral power"
> covers what the formula means quite well.
>
> Best,
> Eelke
>
> 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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