Dear HCP experts,

Any update on this problem ?
Thank you again, and see you maybe next week in Oxford!

Benjamin

De : Benjamin Chiêm
Envoyé : vendredi 25 mai 2018 17:10
À : '[email protected]' <[email protected]>
Objet : MEG TFLA possible misalignment ?

Dear HCP experts,

When looking to tmegpreproc data, during motor task and with trials locked on 
the onset of the flashing cross (TFLA files), I am quite surprised to observe 
that the EMG signal sometimes triggers before the onset of the flashing cross 
in some trials.

To be more specific, let us consider the right hand trials of subject 104012 in 
the first run. In attachment you will find the EMG signal of trial 4 (KO.png) 
and 8 (OK.png), after high-pass Butterworth filtering at 10Hz, and taken in 
absolute value. On the X-axis, time step 611 (i.e. the center of the time 
window) corresponds to the onset of the flashing cross. However, we observe on 
the KO.png figure that the EMG triggers before this time step, although it 
should follow the stimulus, not precede it... I have been able to observe this 
in many trials, as well as in data related to other subjects. Where does this 
come from? Or am I missing something?

Besides, it seems that the TEMG alignment is more reliable.

Thank you in advance for your help !

Benjamin



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