[Eeglablist] Plotting intracranial data

Arnaud Delorme arno at ucsd.edu
Tue Sep 9 10:39:05 PDT 2014


I have looked into this myself for some application.
If I remember well, I wrote a short script placing electrodes on a rectangular grid (x,y).
Then I used the cart2pol function to convert to polar coordinates and populate the EEG.chanlocs structure (theta and radius fields). Make sure all radius are below 0.5 (otherwise divide by twice the max radius).
Then I called the channel editor and I pressed the button to convert polar coordinate to all.

My electrodes were on a nice grid but the head limit was still visible. To remove the head limits, you might want to comment the part in topoplot.m that plots the head limits.
Best,

Arno

On Aug 6, 2014, at 3:03 AM, Seri, Stefano <s.seri at aston.ac.uk> wrote:

> We have performed  ICA/TF analysis and topographic mapping of a verb generation paradigm from intracranial data obtained from a rectangular 4x8 grid. Electrodes/contacts are typically 1 cm apart. In spite of having created an .xyz file with nominal locations plotting data from the GUI defaults to a head shape. Anyone able/willing to advise ?
> 
> BW
> Stfano
> 
> Prof. Stefano Seri MD, PhD, FRCP
> Professor of Clinical Neurophysiology
> and Developmental Neuropsychiatry
> School of Life and Health Sciences, Aston University
> Director MRI Research Centre
> 
> Consultant in Clinical Neurophysiology,
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> Address for correspondence:
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> 
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