[Eeglablist] How can I quantify data in EEGlab ?

Stephen Politzer-Ahles spa268 at nyu.edu
Mon Jun 29 14:42:22 PDT 2015

Hello Imtiaz,

The data are in the field EEG.data; for instance, if you have epoched data
for one participant then this field is a 3-dimensional matrix (channels x
samples x trials). You can work directly with the raw numbers any way you
see fit (for example, choosing a time window and a subset of trials to
average over if you want to statistically analyze mean amplitudes),
directly in MATLAB or after exporting them into e.g. Excel or something
like that; you can check the book by Luck (2005/2012) for a more detailed
discussion and recommendations about how to quantify ERP waveforms.

If you're working with multi-subject STUDY data and/or spectral data as
well as spatiotemporal data, the underlying logic is similar---you can
extract the numbers from the appropriate field of the MATLAB structure and
manipulate them however you need.

I believe the ERPLAB toolbox and similar add-ons also provide a lot of
built-in functions for data quantification, which you could explore.


Stephen Politzer-Ahles
New York University, Abu Dhabi
Neuroscience of Language Lab

On Mon, Jun 29, 2015 at 3:11 PM, Imtiaz SA <imtiaz1877 at gmail.com> wrote:

> Hello everyone,
> I am new to eeglab and need to know if I can quantify eeg data. I can see
> it generates scalp distribution maps and spectra but can I get actual
> number data for those graphs? If yes, how?
> --
> Thanks and regards,
> *Imtiaz*
> PhD Student
> Department of Computer Science
> The University of Texas at San Antonio
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