[FieldTrip] Motor execution and imagination paradigms

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

Hi Vera,

To reiterate: if there are no markers in the data that instructed the subject to actually execute (or imagine) a transient movement, the only thing you can do, is to cut the data into the 5 individual conditions, yielding about 1 minute of data per condition. Then, you could compute the power spectrum for each of those conditions separately, and subsequently compare across conditions.  A powerspectrum can be computed in a variety of ways, one of which is to use

1) ft_redefinetrial with cfg.length = 1; to cut the data of each of the conditions into 1 second snippets
2) ft_freqanalysis on the output of the previous step, using cfg.method = ‘mtmfft’ to obtain a power spectrum for each subject, electrode and condition.



Good luck,
Jan-Mathijs


On 8 Mar 2021, at 12:06, Vera Gramigna <veragramigna at gmail.com<mailto:veragramigna at gmail.com>> wrote:

Thanks a lot.
Within each motor execution condition, the subject performed several times the movements of indicated hands but the events are not time-locked.
During the motor imagination conditions, the subject imagined the movement of indicated hands for 1 minute.
I'm looking for a way to differentiate the 5 conditions in terms of mu rhythms.


Il giorno lun 8 mar 2021 alle ore 11:44 Schoffelen, J.M. (Jan Mathijs) <jan.schoffelen at donders.ru.nl<mailto:jan.schoffelen at donders.ru.nl>> ha scritto:
Hi Vera,

In your experimental setup there is no repetition of events, time-locked to which  it makes sense to compute TFRs. I would expect that your scientific question does not assume that there is a fine-grained modulation of the mu rhythm over time within the individual conditions that you sketched in your earlier e-mail. Therefore, you might consider integrate across as much time as possible, i.e. the 1 minute per condition of interest.

Best wishes,
Jan-Mathijs


On 8 Mar 2021, at 10:50, Vera Gramigna <veragramigna at gmail.com<mailto:veragramigna at gmail.com>> wrote:

Thanks a lot for suggestions.
The procedure to evaluate time-frequency response in https://www.fieldtriptoolbox.org/workshop/oslo2019/timefrequency/, is not indicated for a long duration acquisition?
Thanks a lot

Il giorno lun 8 mar 2021 alle ore 09:44 Schoffelen, J.M. (Jan Mathijs) <jan.schoffelen at donders.ru.nl<mailto:jan.schoffelen at donders.ru.nl>> ha scritto:
Dear Vera,

Perhaps you might find it helpful to start reading the following:

https://www.fieldtriptoolbox.org/walkthrough/

This is a basic explanation of experimental data analysis works in general, focussing on how it’s done in Fieldtrip.

Also, you could have a look at:

https://www.fieldtriptoolbox.org/tutorial/coherence/

Which explains how to extract a neural metric (in this case: coherence) from an experimental set up that is similar to yours. Obviously, you’d need to abstract away quite a bit from this tutorial but it might contain some useful pointers.

Good luck,

Jan-Mathijs


On 6 Mar 2021, at 17:29, Vera Gramigna <veragramigna at gmail.com<mailto:veragramigna at gmail.com>> wrote:

Hello,
I have some EEG EPOC+/Flex acquisitions that are organized as follows:
- 1 min rest->1 min ME RH->1 min ME LH->1 min MI RH->1 min MI LH, considering for ME motor execution and for MI motor imagination.
The total duration of acquisition is 5 minutes. During the condition of motor execution and imagination the subject performed or imagined the related movement for 1 minute.
I need to evaluate the differences in mu rhythm between the five conditions.
Any suggestions on how to perform the analysis?
Thanks
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