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<p class=MsoNormal>Hi,<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>I know there have been lots of questions about this but I
have not found any that answer all of my questions. I am completely new
to using MATLAB and EEGLAB and am a bit overwhelmed. <o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>The steps I have taken in the past to calculate alpha
asymmetry were <o:p></o:p></p>
<p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l0 level1 lfo1'><![if !supportLists]><span
style='mso-list:Ignore'>1)<span style='font:7.0pt "Times New Roman"'>
</span></span><![endif]>Segment continuous EEG data into 4 one minute blocks
based on events markers<o:p></o:p></p>
<p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l0 level1 lfo1'><![if !supportLists]><span
style='mso-list:Ignore'>2)<span style='font:7.0pt "Times New Roman"'>
</span></span><![endif]>For each block create a series of 2.048 second epochs
overlapping by 50% <o:p></o:p></p>
<p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l0 level1 lfo1'><![if !supportLists]><span
style='mso-list:Ignore'>3)<span style='font:7.0pt "Times New Roman"'>
</span></span><![endif]>Reject epochs with ocular or other artefacts (either
manually or automatically)<o:p></o:p></p>
<p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l0 level1 lfo1'><![if !supportLists]><span
style='mso-list:Ignore'>4)<span style='font:7.0pt "Times New Roman"'>
</span></span><![endif]>Calculate mean alpha power at each electrode site for
each block using FFT with Hanning window. <o:p></o:p></p>
<p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l0 level1 lfo1'><![if !supportLists]><span
style='mso-list:Ignore'>5)<span style='font:7.0pt "Times New Roman"'>
</span></span><![endif]>Use these figures to calculate alpha asymmetry (1n
(R/L)<o:p></o:p></p>
<p class=MsoNormal>Unfortunately the system I now use to record EEG ( a very old
version of neuroscan) doesn’t seem have all of these functions
available. <o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>I am able to complete the first step using EEG lab but can’t
find a way to create overlapping epochs to move on to the next steps.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Is anyone able to help me? Please bear in mind I’m
not that familiar with MATLAB.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Thanks<o:p></o:p></p>
<p class=MsoNormal>Kathryn<o:p></o:p></p>
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