correct_baseline_eeg

 Correct baseline of EEG data

 Copyright (C) 2011, ATR All Rights Reserved.
 License : New BSD License(see VBMEG_LICENSE.txt)

0001 function correct_baseline_eeg(p)
0002 % Correct baseline of EEG data
0003 %
0004 % Copyright (C) 2011, ATR All Rights Reserved.
0005 % License : New BSD License(see VBMEG_LICENSE.txt)
0006 
0007 disp(mfilename);
0008 
0009 % Set parameters
0010 twin_base = [-0.5 0];% time window of baseline
0011 ch_eeg = 1:63;
0012 
0013 % Load time information
0014 file = fullfile(p.proj_root, p.eeg_dirname, p.trial_dirname, ['r_' p.file_list{1} '.eeg.mat']);
0015 [~, ~, time_info] = vb_load_meg_data(file);
0016 [~, from] = min(abs(time_info.time-twin_base(1)));
0017 [~, to] = min(abs(time_info.time-twin_base(2)));
0018 
0019 for file = 1:length(p.file_list)
0020     % Load data
0021     old_file = fullfile(p.proj_root, p.eeg_dirname, p.trial_dirname, ['r_' p.file_list{file} '.eeg.mat']);
0022     load(old_file, 'eeg_data')
0023     
0024     % Make average of pre-stimulus EEG to 0
0025     for ch = ch_eeg
0026         for tr = 1:size(eeg_data, 3)
0027             eeg_data(ch, :, tr) = eeg_data(ch, :, tr)-mean(eeg_data(ch, from:to, tr), 2);
0028         end
0029     end
0030     
0031     % Save baseline-corrected EEG data
0032     new_file = fullfile(p.proj_root, p.eeg_dirname, p.trial_dirname, ['br_' p.file_list{file} '.eeg.mat']);
0033     copyfile(old_file, new_file);
0034     vb_save(new_file, 'eeg_data');
0035 end
0036