[Eeglablist] Steps for extracting ERD from EEG for two conditions

Makoto Miyakoshi mmiyakoshi at ucsd.edu
Mon Jun 16 12:03:03 PDT 2014

Dear Ahmed,

Is using wavelet transform (newtimef function in the EEGLAB) not good to do


On Fri, Jun 6, 2014 at 8:45 AM, Ahmed Al-Samarrai <samarrai.a at googlemail.com
> wrote:

> Hi!
> I assume using the 'Simple ERP Study' will not extract ERD plots and
> magnitudes from raw EEG data?
> In which case would the best way to do this in EEGLAB be:
> 1) First remove artefacts
> 2) Then epoch the data
> 3) Filter between 7Hz and 25Hz using the FIR filter
> 4)  Use a single plot for each person  (and not averaging the ERD - I hear
> this can cancel the actual plot even if the trial start times were the same
> - due to the ERD time delay being naturally different from trial to trial).
> 5) Do a spectral plot and using the power value compare the ERD max value
> of each person / or doing a time plot and using the cross hairs to find the
> max value.
> 6) If I then want to compare two sets of ERD plots for two conditions, I
> should then use the above filtered epoched ERD in a 'Study' and then Plot
> Channel Measures to find the p-value?
> Thank you.
> Sorry I am new to this.
> Kind wishes
> Ahmed.
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Makoto Miyakoshi
Swartz Center for Computational Neuroscience
Institute for Neural Computation, University of California San Diego
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