[FieldTrip] Extracting spectral power for intervals within a trial

[Johnson, John T.]

My EEG experiment has people rest, then perform 6 movements, then rest again, etc.
I would like to perform spectral power analysis on portions of those 6 movements baselined to the rest period before the trail. That is, the entire trial is baselined to its own rest period, then spectral power for different electrode montages (e.g. IPL, SPL, etc.) for each interval is extracted, meaned per trial, then stats run between the first 15 trials and the last 15 trials, which are performed under different conditions.

I have event markers for the different movement phases in my eeg data derived from kinematics data. The task is self-paced, so the intervals vary, but as I said, I have markers for the beginning and ending of the times of interest within the trials.

I’m new to FieldTrip and I am coming from the EEGLAB world. I have data previously cleaned and ICAed there, but I’m not adverse to redoing anything needed.

Future directions: source localization using MNI templates, and CoSMoMVPA to find patterns I’m not aware of.

Thanks so much for any advice or pointers to references.

—
John T. Johnson
PhD Candidate, School of Applied Physiology
GTA, Neuroscience Methods
he/him/his
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