[FieldTrip] Regarding conversion of a .ced file into a file format that works with FieldTrip

[Konstantinos Tsilimparis]

Dear Alex,
I believe that .ced files are not supported in FieldTrip, so you will need to import them manually.
You can find more information on how sensor structures work in FieldTrip by looking into the functions ft_datatype_sens and ft_read_sens.
For example:
% Create a sens structure
elec = [];
elec.label = EEG.labels; % As specified in the .ced file
elec.elecpos = [[EEG.X] [EEG.Y] [EEG.Z]]; % As specified in the .ced file
elec.chanpos = elec.elecpos;
elec.unit = 'cm'; % Depending on the units in your .ced file
elec.chantype = 'eeg'; % Specify 'eeg' for each EEG channel
You can then add this sensor structure to your data structure and create a topoplot. The data structure should contain the fields: label, time, elec, avg, var, dof, dimord.
Note that ft_topoplotER requires a 2D layout to plot the results, and I am unsure if this is automatically created from your elec structure.

Best regards,
Konstantinos Tsilimparis

From: fieldtrip <fieldtrip-bounces at science.ru.nl> On Behalf Of Ross, Alexander (rossan) via fieldtrip
Sent: Friday, July 12, 2024 10:41 PM
To: fieldtrip at science.ru.nl
Cc: Ross, Alexander (rossan) <rossan at ucmail.uc.edu>
Subject: [FieldTrip] Regarding conversion of a .ced file into a file format that works with FieldTrip

Hello,

My lab has been using EEGLAB to produce topoplots and my boss wants to try out the topoplot functionality in FieldTrip.

We want to convert a .ced used to produce topoplots into the most appropriate corresponding format for use in FieldTrip. This is because it does not appear .ced is a supported<https://www.fieldtriptoolbox.org/faq/dataformat/> data format.

Attached to this email is the .ced file we use when we work in EEGLAB.

Any assistance would be appreciated.

--Alex
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