[Eeglablist] averaging using EEGlab

Stephen Politzer-Ahles politzerahless at gmail.com
Mon Feb 3 17:57:14 PST 2014


Hi Akshay,

To do statistics on averaged ERPs, I believe the STUDY structure has a lot
of options; I personally haven't used it but there is documentation on the
EEGLAB wiki. You can also plot averages of one or more datasets in the GUI
using Plot > Sum/Compare ERPs.

It's also straightforward to make averages in MATLAB. The EEG.data
structure for epoched data is a three-dimensional matrix (channels *
samples * trials), so you can create an average for a given dataset with:

avg = mean( EEG.data, 3 );

then just do that for every condition for every participant, and you've got
averages that you can plot, analyze, etc.

Hope that helps,
Steve



Stephen Politzer-Ahles
New York University, Abu Dhabi
Neuroscience of Language Lab
http://www.nyu.edu/projects/politzer-ahles/


On Mon, Feb 3, 2014 at 5:19 PM, Akshay Maggu <akshaymaggu86 at gmail.com>wrote:

>
> Hi all,
>
> Is there any way to go beyond epoching to get averaged waveform using
> EEGlab? I do all the pre-processing and get stuck here. Please help.
>
> Best,
> --
> Akshay Raj Maggu,
> Ph. D student,
> Division of Linguistics and Modern Languages,
> Chinese University of Hong Kong,
> Hong Kong.
> webpage: http://www.cuhk.edu.hk/lin/new/people/students/maggu/
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