[Eeglablist] Question about handling data from different systems

[Narges Radman]

Thank you very much Tarik for this very helpful comment. 

I have for the moment selected the electrodes which are common in both systems. 
So this will go in line with your first suggestion and that reassures me. 

Best, 
Narges
----- Original Message -----
From: Tarik S Bel-Bahar <tarikbelbahar at gmail.com>
To: Narges Radman <radmann at ipm.ir>
Cc: eeglablist <eeglablist at sccn.ucsd.edu>
Sent: Mon, 25 May 2020 20:16:34 +0430 (IRDT)
Subject: Re: [Eeglablist] Question about handling data from different systems

Hi Narges, brief thoughts below.

Match up as many of the same electrode positions as possible and use just
those matching ones. Modify labelling nomenclature within each system if
necessary. Preferably dont interpolate to match systems/montages.

Double check to make sure the data from both systems is comparable in terms
if range, amplitude , snr, etc.
Alternatively consider separate ICA on both systems, and then
matching/analyzing common ICs from both systems...you should see 3 to 5
matching ICs with similar topomaps, spectral peak, and IC activation time
series.



On Fri, May 22, 2020, 11:02 AM Narges Radman <radmann at ipm.ir> wrote:

> Dear EEGLAB community
>
> I have got a question regarding analyzing and comparing the EEG (erp) data
> which is recorded using two different EEG recording systems.
>
> Let me explain the situation; I have recorded one group of participants
> with 64-channel Biosemi and another group with 64-channel ANT NEURO.
> Both systems electrode montage are based on 10-20 system but when I
> compare the electrode coordinate files, the coordinates are quite different
> between the two systems, plus, some electrodes exist only in ANT NEURO and
> some in Biosemi.
> My question is, how can I deal with these differences?
> 1. Should I interpolate both group of data in one space? (E.g.
> interpolating ANT data in Biosemi space)
>
> 2. Or should I keep the electrodes which exist in both systems?
>
> I would appreciate if someone suggest a solution.
>
> Best regards,
>
> Narges Radman MD, PhD
> School of Conitive Sciences,
> Institute for Research in Fundamental Sciences,
> Tehran, Iran
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