[FieldTrip] Best procedure for frontal alpha asymmetry

[Eelke Spaak]

Dear Harsimrat,

The two approaches should be equivalent, since power data is always
computed per channel.

Another thing which is probably good to note is that 14-18Hz is not
typically called 'alpha activity'. Depending on your research question, it
might or might not be appropriate to label it alpha anyway, but it is worth
thinking about that. (Typically, alpha would be 8-12Hz, or 7-14Hz or so.)

Best,
Eelke


On 29 November 2012 14:38, Harsimrat Singh <singhharsimrat at gmail.com> wrote:

> Dear Fieldtrippers
>
> I am trying to calculate the difference in the alpha power on the
> frontal electrodes for a subject wise analysis.
>
> Can someone please suggest what will be the correct approach.
>
> Run freq analysis with alpha freq (14-18 ) with a resolution of 2Hz on
> all channels and then do
>
> tf.powspctrm (:,left,:,:) –tf.powsprctrm(:,right,:,:)
>
> OR
>
> run freq analysis on left chans and right chans separately and then do
> subtraction.
>
> Best regards
> Harsimrat
>
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