[Eeglablist] Data epoching, event creation and ERP analysis

Arnaud Delorme arno at ucsd.edu
Thu Apr 4 15:45:11 PDT 2019


Dear Rabnawaz,

Yes, this is analyzing data 101. First you need to import your raw data then fuse the data with E-Prime text files (Menu File > Import event info > From E-prime ….), then filter your data, reject artifact manually, reject data with ICA, extract your epochs and plot ERPs. This is basically the outline for the EEGLAB tutorial, which I suggest you look at.

https://sccn.ucsd.edu/wiki/EEGLAB_Wiki

Best wishes,

Arno

> On Apr 2, 2019, at 2:08 AM, Rabnawaz khan <13mseerabnawaz at seecs.edu.pk> wrote:
> 
> Dear EEGlab users,
> 
> I am new to the data epoching, event processing and ERP analysis, so I need help regarding the event creation in my dataset and processing the ERP.
> I have collected EEG data while the subjects are performing the Stroop color word test using Eprime. The subject responded to 120 stimuli appeared on the screen. The stimuli consisted of congruent and incongruent conditions and presented randomly on the screen.After the subject responded, a fixation was shown for 500ms and then the next stimulus appeared.
> 
> In the output file (i.e Edat file from Eprime software), for each stimulus, the response time (RT), stimulus onset time and stimulus condition (congruent or incongruent) are recorded.
> 
> The response time for all (120) stimuli are different. I want to epoch my continuous EEG data into 120 epoches (i.e. one epoch for each stimuls). And the duration of the epoch should be equal to response time + 500ms (fixation). Then I want to average the epoches based on condition/type (congruent and incongruent) and obtain 2D ERP at each channel. Also, when i plot(scroll) the data from EEGLAB plot menu, i want to see the boundaries inserted for each stimulus.
> 
> I hope my question is clear to you. Any help in this regard is appreciated.
> 
> 
> 
> Best Regards,
> 
> Rabnawaz
> 
> PhD student and Research Assistant
> Center for Health Care, Science and Technology (CHST)
> Universiti Tunku Abdul Rahman (UTAR), Malaysia
> rabnawaz at 1utar.my, +60 18 9196026
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