<html><head></head><body><div style="color:#000; background-color:#fff; font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, Sans-Serif;font-size:13px"><div id="yui_3_16_0_1_1480344000185_4909">Hello Dears,</div><div id="yui_3_16_0_1_1480344000185_4909" dir="ltr">I am developing an experiment where i try to evaluate the thalamocortical dysrhytimia in individuals with chronic pain.</div><div id="yui_3_16_0_1_1480344000185_4909" dir="ltr">In order to improve the quality of the collected signal eeg by the removal of artifacts, i am filtring in two different moments:</div><div id="yui_3_16_0_1_1480344000185_4909" dir="ltr">A) Before dividing into epochs</div><div id="yui_3_16_0_1_1480344000185_4909" dir="ltr">B After being divided into epochs </div><div></div><div id="yui_3_16_0_1_1480344000185_4914"><br></div><div id="yui_3_16_0_1_1480344000185_4914">My question is: Can filtering at two different times compromise the reliability of the collected signal? (ie, in addition to the artifact, am i taking out brain information that compromises the interpretation of the data?)</div><div id="yui_3_16_0_1_1480344000185_4914"><br></div><div id="yui_3_16_0_1_1480344000185_4914">Below is the script used in data processing.</div><div id="yui_3_16_0_1_1480344000185_4914">Thanks a lot for the help.</div><div id="yui_3_16_0_1_1480344000185_4914"><br></div><div id="yui_3_16_0_1_1480344000185_4914"><div id="yui_3_16_0_1_1480344000185_5893">path ='C:\Users\Tiago Lopes\Documents\MATLAB\Script\REPOUSO E IMG\01 Set epochs e ICA (REPOUSO)\';</div><div id="yui_3_16_0_1_1480344000185_5894">epochs ='C:\Users\Tiago Lopes\Documents\MATLAB\Script\REPOUSO E IMG\TABELA DE EVENTOS 5000ms.txt';</div><div id="yui_3_16_0_1_1480344000185_5895">name=strcat(path,'*.ASC');</div><div id="yui_3_16_0_1_1480344000185_5896">d=dir(name);</div><div id="yui_3_16_0_1_1480344000185_5897"><br id="yui_3_16_0_1_1480344000185_5898"></div><div id="yui_3_16_0_1_1480344000185_5899">for j=1:length(d)</div><div id="yui_3_16_0_1_1480344000185_5900"> filename = d(j).name;</div><div id="yui_3_16_0_1_1480344000185_5901"> EEG = pop_loadbci( filename, 600 );</div><div id="yui_3_16_0_1_1480344000185_5902"> EEG = pop_select( EEG,'nochannel',{'FOTO'});</div><div id="yui_3_16_0_1_1480344000185_5903"> EEG = pop_select( EEG,'nochannel',{'EMGd' 'EMGm'});</div><div id="yui_3_16_0_1_1480344000185_5904"> EEG = pop_chanedit(EEG, 'lookup','standard-10-5-cap385.elp');</div><div id="yui_3_16_0_1_1480344000185_5905"> EEG = pop_reref( EEG, [] );</div><div id="yui_3_16_0_1_1480344000185_5906"> EEG = pop_eegfilt( EEG, 0.5, 30, [], [0], 0, 0, 'fir1', 0);</div><div id="yui_3_16_0_1_1480344000185_5907"> EEG = pop_importevent( EEG, 'event',epochs,'fields',{'type' 'latency'},'skipline',1,'timeunit',0.001);</div><div id="yui_3_16_0_1_1480344000185_5908"> EEG = pop_epoch( EEG, { }, [-.420 4.580], 'epochinfo', 'yes');</div><div id="yui_3_16_0_1_1480344000185_5909"> EEG = pop_rmbase(EEG,[-300 0]);</div><div id="yui_3_16_0_1_1480344000185_5910"> EEG = pop_eegfilt( EEG, 1.80, 30, [], [0], 0, 0, 'fir1', 0);</div><div id="yui_3_16_0_1_1480344000185_5911"> EEG = pop_epoch( EEG, { }, [-.420 4.580], 'epochinfo', 'yes');</div><div id="yui_3_16_0_1_1480344000185_5912"> EEG = pop_rmbase(EEG,[-300 0]);</div><div id="yui_3_16_0_1_1480344000185_5913"> EEG = pop_runica(EEG, 'extended',1,'interupt','on');</div><div id="yui_3_16_0_1_1480344000185_5914"> EEG = pop_subcomp( EEG, [1 2], 0);</div><div id="yui_3_16_0_1_1480344000185_5915"> EEG = pop_saveset( EEG, 'filename',d(j).name,'filepath',path);</div><div dir="ltr" id="yui_3_16_0_1_1480344000185_5918">end</div><div dir="ltr" id="yui_3_16_0_1_1480344000185_5918"><br></div></div><div class="signature" id="yui_3_16_0_1_1480344000185_4935"><font size="2" color="#003333">Att</font><font size="2" id="yui_3_16_0_1_1480344000185_5987">. Tiago Lopes</font></div></div></body></html>