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<p>Dear all,<br>
<br>
I use EYEEEG plugin of EEGLAB and am having troubles when synchronizing eye tracking (ET) and EEG data.<br>
<br>
Before I synchronize the ET data with the EEG recording through shared events, I first filter the raw ET data outside EEGLAB (with a script to remove saccades whose size is >20 deg and also remove the corresponding preceding saccade. The script also filters out the fixation durations other than 50-1000ms long, as well as the corresponding following fixation).<br>
<br>
I use this filtered ET file for syncronization and here is what EEGLAB returns for synchronization quality:<br>
<br>
<em>Warning: For 8 of 11 EEG events (72.7%), no ET event of same name was found within plusminus 5 samples. Possibly, some events were not transmitted to the eye tracker?Synch. error is the latency difference between matching ET/EEG events after synchronization.</em><br>
<br>
I tried it with several data. When I check synchronization plots, EEG and ET events sometimes aligned and sometimes not, but the mode of distribution is never 0 (quality of synch graph).<br>
<br>
Is it because ET data is not continuous anymore because I took out some saccade and fixations? I tried to look for an answer online, but I couldn't find anything helpful. Can anyone help me where I can be wrong?<br>
<br>
All the best,<br>
Merve</p>
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