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<div class=Section1>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'>Hi<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'>We have EEG data from a social <span class=SpellE>psychophysiological</span>
experiment, where we systematically manipulated nonverbal cues adopted by a
live confederate in order to examine EEG personality correlates of sensitivity
to real interpersonal distance (2, 4, 8 and 16 feet), gaze (averted, direct),
and smile.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'>Participants were seated in an elevated adjustable
chair, ensuring that the participant and confederate were in same eye level. We
had a 9 seconds exposure time where the participant was instructed to gaze into
the confederate's eyes, irrespective of the confederate's nonverbal
behaviour, which was followed by a 9 seconds <span class=SpellE>intertrial</span>
period where the participants closed their eyes and verbally rated the
pleasantness of the previous trial. There were 12 unique trials (4 distances X
3 facial behaviours), each repeated 6 times.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'>One of the problems with the design is that we could
not control how quickly the participants opened their eyes, so the first second
of the trial had to be discarded, leaving 8 seconds for the trial (and with 6
repeats, a total of 48 seconds per condition).<span style='mso-spacerun:yes'>
</span>Of course, this varied slightly from participant to participant, some
took 200 ms to start opening their eyes, others 400 etc.<span
style='mso-spacerun:yes'> </span>Thus, there was not a strict time locking of
the EEG record and the stimulus signal (i.e., the confederate).<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<pre><font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>We now wish to apply coherence analysis to some of the data using EEGLAB if possible, but we've run into a few problems so any advice on the matter would be greatly appreciated. <o:p></o:p></span></font></pre><pre><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'><o:p> </o:p></span></font></pre><pre
style='margin-left:36.0pt;text-indent:-18.0pt;mso-list:l0 level1 lfo1'><![if !supportLists]><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial;mso-fareast-font-family:
Arial;mso-bidi-font-family:Arial'><span style='mso-list:Ignore'>1.<font size=1
face="Times New Roman"><span style='font:7.0pt "Times New Roman"'> </span></font></span></span></font><![endif]><font
face=Arial><span style='font-family:Arial'>Length of epoch<o:p></o:p></span></font></pre><pre><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'><o:p> </o:p></span></font></pre><pre><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>Since each of the 12 unique trials lasts 8 seconds, and is repeated 6 times (a total of 48 seconds), what is the best way to epoch my data for coherence analysis?<span style='mso-spacerun:yes'> </span>Should I divide each 8 second trial into say epoch of 2 seconds, yielding a total of 24 epochs per condition? Or can I leave the epoch length to 8 seconds, which would only amount to 6 trials per condition for the coherence analysis? Since I am not yet that knowledgeable about coherence analysis, I don't know whether there <span
class=GramE>is</span> a minimum number of epochs needed for a coherence analysis. <o:p></o:p></span></font></pre><pre
style='margin-left:18.0pt'><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></pre><pre style='margin-left:
36.0pt;text-indent:-18.0pt;mso-list:l0 level1 lfo1'><![if !supportLists]><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial;mso-fareast-font-family:
Arial;mso-bidi-font-family:Arial'><span style='mso-list:Ignore'>2.<font size=1
face="Times New Roman"><span style='font:7.0pt "Times New Roman"'> </span></font></span></span></font><![endif]><font
face=Arial><span style='font-family:Arial'>baseline removal<o:p></o:p></span></font></pre><pre><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>Given that the EEG data are not exactly <span
class=SpellE>timelocked</span> to the "confederate's <span
class=SpellE>behaviour</span>", is there any other way of removing baseline activity?<span style='mso-spacerun:yes'> </span>Is it best to define the first second as baseline and the other 7 seconds as trial data?<span style='mso-spacerun:yes'> </span><o:p></o:p></span></font></pre>
<p class=MsoNormal style='tab-stops:list 36.0pt left 45.8pt 91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt'><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial;mso-ansi-language:
EN-US'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='tab-stops:list 36.0pt left 45.8pt 91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt'><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial;mso-ansi-language:
EN-US'>Any advice on the matter would be greatly appreciated.<o:p></o:p></span></font></p>
<p class=MsoNormal style='tab-stops:list 36.0pt left 45.8pt 91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt'><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial;mso-ansi-language:
EN-US'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='tab-stops:list 36.0pt left 45.8pt 91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt'><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial;mso-ansi-language:
EN-US'>Regards<o:p></o:p></span></font></p>
<p class=MsoNormal style='tab-stops:list 36.0pt left 45.8pt 91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt'><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial;mso-ansi-language:
EN-US'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='tab-stops:list 36.0pt left 45.8pt 91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt'><st1:PersonName><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial;mso-ansi-language:
EN-US'>Soren Andersen</span></font></st1:PersonName><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial;mso-ansi-language:EN-US'><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial;mso-bidi-font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial;mso-bidi-font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial;mso-no-proof:yes'>Dr. Soren Bo Andersen</span></font><span
lang=EN-GB style='mso-no-proof:yes'><o:p></o:p></span></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial;mso-no-proof:yes'>Department of Psychology</span></font><span
lang=EN-GB style='mso-no-proof:yes'><o:p></o:p></span></p>
<p class=MsoNormal><st1:place><st1:PlaceType><font size=2 face=Arial><span
lang=EN-GB style='font-size:10.0pt;font-family:Arial;mso-no-proof:yes'>University</span></font></st1:PlaceType><font
size=2 face=Arial><span lang=EN-GB style='font-size:10.0pt;font-family:Arial;
mso-no-proof:yes'> of </span></font><st1:PlaceName><font size=2 face=Arial><span
lang=EN-GB style='font-size:10.0pt;font-family:Arial;mso-no-proof:yes'>Wales</span></font></st1:PlaceName></st1:place><font
size=2 face=Arial><span lang=EN-GB style='font-size:10.0pt;font-family:Arial;
mso-no-proof:yes'> </span></font><st1:City><st1:place><font size=2 face=Arial><span
lang=EN-GB style='font-size:10.0pt;font-family:Arial;mso-no-proof:yes'>Swansea</span></font></st1:place></st1:City><span
lang=EN-GB style='mso-no-proof:yes'><o:p></o:p></span></p>
<p class=MsoNormal><st1:place><st1:PlaceName><font size=2 face=Arial><span
lang=EN-GB style='font-size:10.0pt;font-family:Arial;mso-no-proof:yes'>Singleton</span></font></st1:PlaceName><font
size=2 face=Arial><span lang=EN-GB style='font-size:10.0pt;font-family:Arial;
mso-no-proof:yes'> </span></font><st1:PlaceType><font size=2 face=Arial><span
lang=EN-GB style='font-size:10.0pt;font-family:Arial;mso-no-proof:yes'>Park</span></font></st1:PlaceType></st1:place><span
lang=EN-GB style='mso-no-proof:yes'><o:p></o:p></span></p>
<p class=MsoNormal><st1:City><st1:place><font size=2 face=Arial><span
lang=EN-GB style='font-size:10.0pt;font-family:Arial;mso-no-proof:yes'>Swansea</span></font></st1:place></st1:City><font
size=2 face=Arial><span lang=EN-GB style='font-size:10.0pt;font-family:Arial;
mso-no-proof:yes'> SA2 8PP</span></font><span lang=EN-GB style='mso-no-proof:
yes'><o:p></o:p></span></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span lang=EN-GB
style='font-size:12.0pt;mso-no-proof:yes'> <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial;mso-no-proof:yes'>tel: + 44 (0) 1792 295713</span></font><span
lang=EN-GB style='mso-no-proof:yes'><o:p></o:p></span></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial;mso-no-proof:yes'>fax: + 44 (0) 1792 295679</span></font><span
lang=EN-GB><o:p></o:p></span></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span lang=EN-GB
style='font-size:12.0pt'><o:p> </o:p></span></font></p>
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