[Eeglablist] How to Produce Spline interpolated isovoltage maps with EEGLAB

[Delorme, Arnaud]

Spline interpolation is performed in EEG as described in

Perrin F, Pernier J, Bertrand O, Echallier JF. Spherical splines for scalp potential and current density mapping. Electroencephalogr Clin Neurophysiol. 1989;72(2):184-187. doi:10.1016/0013-4694(89)90180-6

https://urldefense.com/v3/__https://www.semanticscholar.org/paper/Spherical-splines-for-scalp-potential-and-current-Perrin-Pernier/3633131bec6530252dc7b14af159ae1946f9a0a7__;!!Mih3wA!RHSd9ACgpmK1Sh6dDa6elt2M56uaCtssoN7_isWT7rTI8GuizDmUmNdzAqVsGfgExXBX-Q$ 

It is implemented in eeg_interp.m to interpolate channels.

Arno

> On Jul 30, 2020, at 9:02 AM, Makoto Miyakoshi <mmiyakoshi at ucsd.edu> wrote:
> 
> Dear Isil,
> 
> I believe there is 'contour' option in spectopo() function. I got an
> inquiry from my old friend and collaborator if there is any optional
> command to control the low-level behavior of this option (which I could not
> find).
> 
> Makoto
> 
> On Tue, Jul 21, 2020 at 9:11 AM Isil Bilgin <bilginlab at gmail.com> wrote:
> 
>> Dear All,
>> 
>> I keep encountering "Spline interpolated isovoltage maps" in papers but
>> cannot find any explanation regarding how they are produced. From my
>> search, I only found this solution for a similar type of question asked
>> years go https://sccn.ucsd.edu/pipermail/eeglablist/2006/001610.html but
>> this simply creates difference scalp voltage maps rather than doing spline
>> interpolation.
>> 
>> 
>> So I was wondering is there any plugin or function in EEGLAB that would
>> help me to create such maps for the difference ERPs I want to produce, and
>> if you could share your recommendations with me please.
>> 
>> Thank you very much for your replies in advance,
>> 
>> Kind regards
>> Isil Bilgin
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