Read GDF File from BCI Competition 2008 – Graz data set B

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Çağatay Murat Yılmaz 2018-10-10

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https://ww2.mathworks.cn/matlabcentral/answers/423195-read-gdf-file-from-bci-competition-2008-graz-data-set-b

评论： Prithwish 2023-8-19

Hello, I want to read data from BCI Competition 2008 – Graz data set B and use these data for feature extraction and classification. I wrote the following code to read and store different types of motor imageries in different variables. For example, A01T_C1 variaable stores all left imagery data. Am i doing right? Also, I want to ask that am i need to use EOG data before feature extraction. If so, what can I do to remove artefacts?

Thank you very much.

Data set description can be found here: http://www.bbci.de/competition/iv/desc_2a.pdf

filename = 'A04T.gdf';
[s, HDR] = sload('.\BCICIV_2a_gdf\A04T.gdf');
type=HDR.EVENT.TYP;
pos=HDR.EVENT.POS;
dur=HDR.EVENT.DUR;
iv_c1=1; iv_c2=1; iv_c3=1; iv_c4=1;
for i=1:size(type,1)
    if type(i,1)==769
        subdata=s(pos(i,1):pos(i,1)+dur(i,1),:);
        A01T_C1(iv_c1,:,:)=subdata;
        iv_c1=iv_c1+1;
    elseif type(i,1)==770
        subdata=s(pos(i,1):pos(i,1)+dur(i,1),:);
        A01T_C2(iv_c2,:,:)=subdata;
        iv_c2=iv_c2+1;
    elseif type(i,1)==771
        subdata=s(pos(i,1):pos(i,1)+dur(i,1),:);
        A01T_C3(iv_c3,:,:)=subdata;
        iv_c3=iv_c3+1;
     elseif type(i,1)==772
        subdata=s(pos(i,1):pos(i,1)+dur(i,1),:);
        A01T_C4(iv_c4,:,:)=subdata;
        iv_c4=iv_c4+1;
    end
end