[Eeglablist] ERSP : activity systematically shifted at t=0
Alibou Nabil William Jean-Pierre
nabil.alibou at epfl.ch
Mon Sep 2 04:10:43 PDT 2019
I am starting in the eeg analysis field and i was studying the TF analysis of my dataset with newtimef()
but i noticed that the activity, regardless of the event, was always at t = 0s (and for every subject).
Exemple of ERP/ERSP of components from my dataset (with extended epoch) :
https://imgur.com/ptEEpPD
<https://i.imgur.com/ptEEpPD.png>https://imgur.com/yVgDg2k
https://imgur.com/PLLqEMz
https://imgur.com/rUl0q8K
https://imgur.com/ftds9nY
=> However if i test it with a constant signal with a spike at a certain time the spectral activity displayed will be at the corresponding t.
Im using this parameters :
figure();
newtimef(EEG.icaact(5,:,:), EEG.pnts, [EEG.xmin EEG.xmax]*1000, EEG.srate,0,'freqscale','linear', ...
'cycles',[5 0.5],'elocs', EEG.chanlocs, 'chaninfo', EEG.chaninfo, ...
'freqs',[5 50], 'maxfreq',50,'baseline',[EEG.xmin EEG.xmax]*1000,'trialbase', 'off','basenorm', 'off', 'plotitc', 'off', ... % divise into 2 portions of frequencies for study easily ?
'caption','test', 'padratio', 4,'alpha',NaN,'ntimesout',100,'winsize',700, 'erspmax', 0.5);
I have changed almost every parameter but i still have this problem and i don't know the cause, thanks you in advance for your help.
Best regards,
Nabil
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