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Bst add ref channel for Duneuro2019 #893

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Bst add ref channel for Duneuro2019 #893

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2386a15
Handle EEG reference channels in duneuro forward
tmedani Feb 27, 2026
0359be4
Simplify EEG reference handling for Duneuro
tmedani Feb 27, 2026
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45 changes: 44 additions & 1 deletion toolbox/forward/bst_duneuro.m
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Original file line number Diff line number Diff line change
Expand Up @@ -48,6 +48,27 @@
isEcog = strcmpi(cfg.ECOGMethod, 'duneuro') && ~isempty(cfg.iEcog);
isSeeg = strcmpi(cfg.SEEGMethod, 'duneuro') && ~isempty(cfg.iSeeg);

% Find if EEG Ref exists and find its position
iRef = channel_find(cfg.Channel, {'EEG REF'});
switch length(iRef)
case 0 % no reference = > output will be averaged to Avgref
refLoc = [];
case 1 % one reference
refLoc = [cfg.Channel(iRef).Loc]';
case 2 % two references => ex: linked mastoids
refLoc = [cfg.Channel(iRef).Loc]';
% limitation of Duneuro 2019, can not handel multiple ref elec;
% Assign by default the first channel,
% will be improved in the DN2026
refLoc = refLoc(1,:);
otherwise
refLoc = [];
end
% remove nan value if exist
refLoc(any(isnan(refLoc), 2), :) = [];
% if final ref = []; the average ref will be applied by default


% Get the modality
if ((isEeg || isEcog || isSeeg) && isMeg)
dnModality = 'meeg';
Expand All @@ -65,6 +86,13 @@
if (isEeg || isEcog || isSeeg)
cfg.iEeg = [cfg.iEeg, cfg.iSeeg, cfg.iEcog];
EegLoc = cat(2, cfg.Channel(cfg.iEeg).Loc);

% Add the reference channel
% Duneuro 2019 assume the first electrode as the reference, so here we
% append it in the first row
if ~isempty(refLoc)
EegLoc = [refLoc' EegLoc];
end
end

% Get MEG positions/orientations
Expand Down Expand Up @@ -544,8 +572,23 @@
%% ===== READ LEADFIELD ======
bst_progress('text', 'DUNEuro: Reading leadfield...');
% EEG
if (isEeg || isEcog || isSeeg)
if (isEeg || isEcog || isSeeg)
GainEeg = in_duneuro_bin(fullfile(TmpDir, cfg.BstEegLfFile))';
% postprocess the gain according to the ref channel
if ~isempty(refLoc)
switch length(iRef)
case 1
% Remove the added channel, DN assume this is the ref
GainEeg(1,:) = [];
otherwise
% Apply the average reference (this is not correct as chann1 is assumed to be the ref)
% THis will be improved in DN2026 version
GainEeg = GainEeg - mean(GainEeg);
end
else
% Apply the average reference
GainEeg = GainEeg - mean(GainEeg);
end
end

%MEG
Expand Down