[FieldTrip] wavelet analysis
jan.schoffelen at donders.ru.nl
Tue Jun 21 09:08:34 CEST 2011
Thanks for your message. I gave the faq a good read, and I agree that
the answer can be made a bit more clear. I updated the faqs you
mentioned and hope that this explains the issue better.
Let me know if it is still not clear.
On Jun 18, 2011, at 11:09 AM, Manuel Mercier wrote:
> Dear Field-trippers
> I recently ran some time frequency analysis using the wavelet method.
> I was surprise to see that whereas I asked for a step of 1Hz, it was
> the case every alternate step (for foi=2:1:10 ; I got [2 3.2 4 5.2 6
> 7.2 8
> 9.2 10]), and it was also the case when I changed the toi (2.5, 1.5
> constant trials length of 2.5 sec and sampling freq 1000Hz).
> I found a kind of explanation following the faq
> Still it is not clear to me why this refers to Fourier transform.
>> From my (none specialist) point of view it is possible to produce a
> wavelet of any size (Hz;Dt).
> It is clear that there is some limitations based on the duration of
> epochs and the number of time points. But in the present case it
> be a problem, is it?
> Would be please if someone can help me with this issue.
> Thanks in advance
> fieldtrip mailing list
> fieldtrip at donders.ru.nl
Dr. J.M. (Jan-Mathijs) Schoffelen
Donders Institute for Brain, Cognition and Behaviour,
Centre for Cognitive Neuroimaging,
Radboud University Nijmegen, The Netherlands
J.Schoffelen at donders.ru.nl
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