[FieldTrip] FT_LATERALIZEDPOTENTIAL

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

Ciao Bianca,

I assume that you have already consulted the code to look for the answer. As you can see on line 140 and beyond, the fields of the data structure that are used for hte LRP are called ‘avg’. To me this suggests that you should do cfg.keeptrials = ’no’ in ft_timelockanalysis. For the channelcmb, (also see lines 140 and beyond) the left and right columns of this are used to define the corresponding ‘left’ and ‘right’ channels that are to be subtracted. So - indeed - you either leave out the midline electrodes, or you include them in the channelcmb as {‘midline1’ ‘midline1’} (etc), which will result in a LRP of 0 on those channels.

Best wishes,
Jan-Mathijs




On 18 Mar 2021, at 13:54, Bianca Trovò <bianca.trovo at alumni.unitn.it<mailto:bianca.trovo at alumni.unitn.it>> wrote:

Hello,

I wanted to ask for some clarification regarding this function for computing the lateralized readiness potential (LRP)<https://www.fieldtriptoolbox.org/reference/ft_lateralizedpotential/>.
The input datasets that come from FT_TIMELOCKANALYSIS such as avgL, avgR should have cfg.keeptrials = 'yes'? How do I define
the configuration: cfg.channelcmb = Nx2 cell-array? Since I have a 64 EEG cap, should I divide 60 channels into 2 columns leaving out the midline electrodes (2, 12, 30 etc)? I assume that this channel combination serves for the subtraction?

Thanks for your help.

Best,
------------------------------------------------------------
<http://internationaloffice.ceasaclay.com/>
Bianca Trovò,

Ph.D. candidate in Brain, Behaviour, Cognition
Sorbonne Université (Faculty of Science & Engineering),
Cognitive Neuroimaging Unit (UNICOG Lab), Inserm U992
Paris-Saclay, FRANCE - ORCID<https://orcid.org/0000-0002-6776-2304> | Google Scholar<https://scholar.google.com/citations?user=hoCMB_kAAAAJ&hl=en>



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