[FieldTrip] Best procedure for frontal alpha asymmetry

[Harsimrat Singh]

Thanks Elke and Jorn

Apologies for mismatch 'name' and 'freq range'. Actually I went out
looking for higher freqs than alpha but didn't change the name.
I agree with Elke that the outcome should be same. I think I will go
with the convention - freq analysis on all channels and then
separating out the ones I need.

Best regards
Harsimrat

On 29 November 2012 14:15, Eelke Spaak <eelke.spaak at donders.ru.nl> wrote:
> 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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>
>
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