Documentation: Some Practical Examples of how to use the BBCI Toolbox
IN CONSTRUCTION
Table of Contents
ERP Analysis: #ERP-Aanylsis
Spectral Analyses: <to come>
<more to come>
ERP Analysis
% Define some settings
disp_ival= [-200 1000];
ref_ival= [-200 0];
crit_maxmin= 70;
crit_ival= [100 800];
crit_clab= {'F9,z,10','AF3,4'};
clab= {'Cz','PO7'};
file= 'VPibv_10_11_02/CenterSpellerMVEP_VPibv';
[cnt, mrk, mnt]= eegfile_loadMatlab(file);
% Apply highpass filter to reduce drifts
b= procutil_firlsFilter(0.5, cnt.fs);
cnt= proc_filtfilt(cnt, b);
% Artifact rejection based on variance criterion
mrk= reject_varEventsAndChannels(cnt, mrk, disp_ival, 'verbose', 1);
% Segmentation
epo= cntToEpo(cnt, mrk, disp_ival);
% Artifact rejection based on maxmin difference criterion on frontal chans
epo= proc_rejectArtifactsMaxMin(epo, crit_maxmin, ...
'clab',crit_clab, 'ival',crit_ival, 'verbose',1);
epo= proc_baseline(epo, ref_ival);
epo_r= proc_r_square_signed(epo);
fig_set(1);
constraint= ...
{{-1, [100 300], {'I#','O#','PO7,8','P9,10'}, [50 300]}, ...
{1, [200 350], {'P3-4','CP3-4','C3-4'}, [200 400]}, ...
{1, [400 500], {'P3-4','CP3-4','C3-4'}, [350 600]}};
[ival_scalps, nfo]= ...
select_time_intervals(epo_r, 'visualize', 1, 'visu_scalps', 1, ...
'title', untex(file), ...
'clab',{'not','E*'}, ...
'constraint', constraint);
printFigure('r_matrix', [18 13], opt_fig);
ival_scalps= visutil_correctIvalsForDisplay(ival_scalps, 'fs',epo.fs);
fig_set(3)
H= grid_plot(epo, mnt, defopt_erps, 'colorOrder',colOrder);
grid_addBars(epo_r, 'h_scale',H.scale);
printFigure(['erp'], [19 12], opt_fig);
fig_set(2);
H= scalpEvolutionPlusChannel(epo, mnt, clab, ival_scalps, defopt_scalp_erp2, ...
'colorOrder',colOrder);
grid_addBars(epo_r);
printFigure(['erp_topo'], [20 4+5*size(epo.y,1)], opt_fig);
fig_set(4, 'shrink',[1 2/3]);
scalpEvolutionPlusChannel(epo_r, mnt, clab, ival_scalps, defopt_scalp_r2);
printFigure(['erp_topo_r'], [20 9], opt_fig);
Even in this very basic ERP analysis, there are several steps, in which the choice of processing can have quite a big impact on the results, but nevertheless, the correct choice is not clear to us (maybe we will find out a recommendable choice at some point).