[FieldTrip] Beginner in FieldTrip: EEGLab to FieldTrip + SSVEP Analysis

[Taylor, Danielle]

Hello FieldTrippers,

My name is Danielle Taylor and I am a graduate student at Oklahoma State University. I am currently trying to learn to use FieldTrip, and I am quite the novice. I am, however, quite familiar with EEGLab, and have previously used Matlab to run EEGLab processes.

 I am currently processing data for a study in which I am evaluating an ERP (the LPP) and the SSVEP. I have compiled my ERPs, and therefore hoped to import my EEGLab data to Fieldtrip and complete SSVEP analyses.

My questions are quite broad.
1) Can I import EEGLab data that has been processed through artifact rejection (I have used filters, ICA, have data binned and epoched, and have run automated artifact rejection routines)? Is it possible to import from this point and then complete fourier transformation in fieldtrip? If so, how? I have seen that one can use eeglab2fieldtrip, but do I need other specifications in my code? Alternatively, the EEGLab website recommends this code:
hdr = ft_read_header( EEGLABFILE );

data = ft_read_data( EEGLABFILE, 'header', hdr );
events = ft_read_event( EEGLABFILE, 'header', hdr );

Does it matter which method I use?

2) I am evaluating the SSVEP in 4 separate windows that are the same measurements as my ERP (400-700ms, 700-1000, 1000-2000 and 2000-3000). I have seen samples of code that use a moving window, but not that have used specific windows such as this.

I apologize if these questions are too vague, but any help or even a sample script would be much appreciated. Thank you very much for your assistance in advance!

Regards,

Danielle Taylor, M.S.
Doctoral Candidate,
Clinical Psychology
Oklahoma State University

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https://doi.org/10.1371/journal.pcbi.1002202