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</o:shapelayout></xml><![endif]--></head><body lang=EN-GB link="#0563C1" vlink="#954F72"><div class=WordSection1><p class=MsoNormal>Dear all<o:p></o:p></p><p class=MsoNormal>I want to compute power spectrum density (PSD) for 4 groups using EEGlab study structure. I want to use ‘psd’ as ‘specmode’.<o:p></o:p></p><p class=MsoNormal>I have used the following codes<o:p></o:p></p><p class=MsoNormal><span style='color:red'>[STUDY ALLEEG] = std_precomp(STUDY, ALLEEG, {},'interp','on','recompute','on','spec','on','specparams',{'specmode' 'psd' 'logtrials' 'off' });<o:p></o:p></span></p><p class=MsoNormal><span style='color:red'> </span>This code produce PSD without logarithmic transformation. When change the status of 'logtrials' from 'off' to ‘on’ as shown in the following codes <o:p></o:p></p><p class=MsoNormal><span style='color:red'>[STUDY ALLEEG] = std_precomp(STUDY, ALLEEG, {},'interp','on','recompute','on','spec','on','specparams',{'specmode' 'psd' 'logtrials' </span><b>'on'<span style='color:red'> </span></b><span style='color:red'>});<o:p></o:p></span></p><p class=MsoNormal>The resulted PSD is zero.<o:p></o:p></p><p class=MsoNormal>Can you please advise me with this?<o:p></o:p></p><p class=MsoNormal>Many thanks<o:p></o:p></p><p class=MsoNormal>Mohammed<o:p></o:p></p></div></body></html>