[Eeglablist] average for frequency power scalp maps

[Tom Farnan]

Hi Ana,

I'm no 'expert' but I may as well start the ball rolling by strongly
suggesting the use of the Surface Laplacian transform - which is
reference-free and has particular advantages in reducing the influence of
volume conduction - 'sharpening' the topography of observed EEG.  It is
commonly applied when performing connectivity analyses involving coherence
between channels.

There is an entire excellent issue of *Psychophysiology*
<https://urldefense.com/v3/__https://www.sciencedirect.com/journal/international-journal-of-psychophysiology/vol/97/issue/3__;!!Mih3wA!FSiweWPOcbND96aLJLfPk4AvgOoFvqyzn2DiGvAdVMosdZGqsUiAZdEk7XX2jW4IAd7Q7vGtTmIbW62fMT6YoA$ >
dedicated to the many benefits of its use.

best wishes,

Tom Farnan

On Wed, 17 Sept 2025 at 18:18, Ana Navarro Cebrian via eeglablist <
eeglablist at sccn.ucsd.edu> wrote:

> Dear all,
>
> I have been using the average as my reference for years. I am now really
> interested in getting the most reliable frequency power scalp maps and
> would like to know what people's thoughts are about the best reference to
> use for this. I was just looking at Yao, Wang, Oostenveld et al., 2005,
> paper and it has made me doubt about the use of the average for power maps.
> I may also end up looking at frequency correlations between channels.
>
> Thank you in advance for any advice.
> Best,
> Ana
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-- 
He/Him
PhD Candidate
Trinity College Institute of Neuroscience

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