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</o:shapelayout></xml><![endif]--></head><body lang=NL-BE link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span lang=EN-US>Hi all<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>For a current study we are applying ICA. Because our lab was not free of noise we wanted to run ICA 2 times and we hope to obtain cleaner components the second time.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>After searching the internet and the literature we are still not sure what the limits of such a second ICA run are.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>Therefore we were wondering:<o:p></o:p></span></p><p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l0 level1 lfo1'><![if !supportLists]><span lang=EN-US><span style='mso-list:Ignore'>1.<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span lang=EN-US>Is it even possible to indicate ICA components in both the first and second ICA<o:p></o:p></span></p><p class=MsoListParagraph style='margin-left:72.0pt;text-indent:-18.0pt;mso-list:l0 level2 lfo1'><![if !supportLists]><span lang=EN-US><span style='mso-list:Ignore'>a.<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span lang=EN-US>We read that you can use the PCA option for this to reduce the dimensions<o:p></o:p></span></p><p class=MsoListParagraph style='margin-left:72.0pt;text-indent:-18.0pt;mso-list:l0 level2 lfo1'><![if !supportLists]><span lang=EN-US><span style='mso-list:Ignore'>b.<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span lang=EN-US>However why can’t we use ICA the second time?<o:p></o:p></span></p><p class=MsoListParagraph style='margin-left:72.0pt;text-indent:-18.0pt;mso-list:l0 level2 lfo1'><![if !supportLists]><span lang=EN-US><span style='mso-list:Ignore'>c.<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span lang=EN-US>Other sites mention that you shouldn’t indicate components in the first ICA<o:p></o:p></span></p><p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l0 level1 lfo1'><![if !supportLists]><span lang=EN-US><span style='mso-list:Ignore'>2.<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span lang=EN-US>If we run ICA 2 times<o:p></o:p></span></p><p class=MsoListParagraph style='margin-left:72.0pt;text-indent:-18.0pt;mso-list:l0 level2 lfo1'><![if !supportLists]><span lang=EN-US><span style='mso-list:Ignore'>a.<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span lang=EN-US>Should we only remove the noise the first time?<o:p></o:p></span></p><p class=MsoListParagraph style='margin-left:72.0pt;text-indent:-18.0pt;mso-list:l0 level2 lfo1'><![if !supportLists]><span lang=EN-US><span style='mso-list:Ignore'>b.<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span lang=EN-US>Or should we also already indicated components such as blinks, bad channels, etc.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>Thanks in advance.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>Regards, Veerle Ross<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p></div></body></html>