[FieldTrip] Cluster-based permutation test with individual frequency bands

[Eelke Spaak]

Dear Sebastian,

> How would I only include those frequencies that fall into each participant’s alpha band? As far as I understand it, the cfg.frequency argument of ft_freqstatistics only allows the specification of a fixed band.

You're right. The solution I'd use is to hack the freq structures a
bit: compute a per-participant average powspctrm in the band of
interest (using either ft_selectdata or mean()), and then simply
replace the freq.freq field with e.g. 10 (or anything else arbitrary
yet identical across participants). Then ft_freqstatistics with
cfg.frequency = 10 will work.

Note, though, that comparing power between different frequencies is
potentially problematic, due to different noise (and SNR) levels at
different frequencies. But I guess that if you're comparing relative
ERD/ERS rather than raw power, you should be relatively safe. Just
something to keep in mind.

Cheers,
Eelke

>
> Any help would be greatly appreciated!
>
> Regards,
> Sebastian
>
> -----------
> Dr. Sebastian Sauppe
> Department of Comparative Linguistics, University of Zurich
> Homepage: https://sites.google.com/site/sauppes/
> Twitter: @SebastianSauppe
> Google Scholar Citations: https://scholar.google.de/citations?user=wEtciKQAAAAJ
> ResearchGate: http://www.researchgate.net/profile/Sebastian_Sauppe
> ORCID ID: http://orcid.org/0000-0001-8670-8197
>
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