How to do eeg preprocessing

Hi all ,

i am trying to implement a code for the sake of preprocessig an eeg signals, however i coudnt understand without comments added

Could anyone explain a bit if should add any toolbox and if i should create any folder . please add comments if possible

dataFolder='D:\Data\BCICIV_1\';

files=dir([dataFolder 'BCICIV_ca*.mat']);

ref=[];

for s=1:length(files)

s

load([dataFolder files(s).name]); fs=nfo.fs;

EEG=.1*double(cnt);

b=fir1(50,2*[8 30]/nfo.fs);%FIRfiltDesign(nfo.fs,8,30,[],[],1)

EEG=filter(b,1,EEG);

y=mrk.y'; %(-1 for class one or 1 for class two)

nTrials=length(y);

X=nan(size(EEG,2),300,nTrials);

for i=1:nTrials

X(:,:,i)=EEG(mrk.pos(i)+0.5*nfo.fs:mrk.pos(i)+3.5*nfo.fs-1,:)'; % [0.5-3.5] seconds epoch, channels*Times

end

save(['./Data1/A' num2str(s) '.mat'],'X','y','fs');

end

thans all in advance

[Abdullah Abdullah]

Replace the line X=nan(size(EEG,2),300,nTrials); by X=nan(size(EEG,2),3000,nTrials);

3000 not 300.

Answer 1

[Jonas]

You should use breakpoints to step by step understand the code. Seems to use fairly basic MATLAB commands.

Regarding toolboxes, if you want to run this code, you will need the Signal Processing Toolbox to be able to use the 'fir1' function. This function is used to create a bandpass filter with a window passband as input parameter.