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

[Schoffelen, J.M. (Jan Mathijs)]

Dear Sebastian,

Fieldtrip only compares apples with apples, oranges with oranges, same-named electrodes with one another, and indeed also same frequency bins (and time points).


In your case your well-motivated intention is to ask Fieldtrip to compare alpha band in sub-001 with alpha band in sub-002 etc. This is perfectly fine, but would require you to fool around a bit with the subject-specific data structures. I’d extract per subject the alpha frequency specific data, resulting in a data structure with just a single frequency bin (and possibly multiple time bins). Next, you’d need to replace the individual data structures’ ‘freq’-bin with a value that is common across subjects, say 10. Then, it should be business as usual.

Best wishes,
Jan-Mathijs



On 16 Jul 2019, at 16:38, Sebastian Sauppe <sauppe.s at gmail.com<mailto:sauppe.s at gmail.com>> wrote:

Dear FieldTrip community,

Is it possible to run cluster-based permutation tests (ft_freqstatistics) with individual frequency bands?

I have an EEG experiment in which I want to compare alpha ERD/ERS between two conditions. I also have resting state recordings of the participants from which I extracted the peak alpha frequency to calculate individual frequency band ranges for each participant (like suggested by Klimesch and practiced in many papers).

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.

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<https://twitter.com/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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