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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Thanks Leisha. Maybe I should clarify. <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>We need the trigger data on-line, so that
it can be recorded along with MEG data during acquisition. This makes it convenient
for analysis later, so that we can re-align trials according to stimulus onset,
etc.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Hence, it is very important that the
trigger be an accurate reflection of the actual onset.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>After some discussion with a colleague, if
there is not a simple way to do it via E-prime that is reliable, I’m considering
using feedback from a photo-diode system for the trigger.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Of course, getting a similar feedback from
sound presentation seems even more difficult, so I’m open to suggestions
on that one, too…<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Thanks,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Dave<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
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<p class=MsoNormal><b><font size=2 color=black face=Tahoma><span
style='font-size:10.0pt;font-family:Tahoma;color:windowtext;font-weight:bold'>From:</span></font></b><font
size=2 color=black face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma;
color:windowtext'> eprime@mail.talkbank.org [mailto:eprime@mail.talkbank.org] <b><span
style='font-weight:bold'>On Behalf Of </span></b>Leisha Wharfield<br>
<b><span style='font-weight:bold'>Sent:</span></b> Monday, June 19, 2006 11:51
AM<br>
<b><span style='font-weight:bold'>Cc:</span></b> eprime@mail.talkbank.org<br>
<b><span style='font-weight:bold'>Subject:</span></b> Re: synchronized trigger
and stim presentation</span></font><font color=black><span style='color:windowtext'><o:p></o:p></span></font></p>
</div>
<p class=MsoNormal><font size=3 color=black face="Times New Roman"><span
style='font-size:12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=3 color=black face="Times New Roman"><span
style='font-size:12.0pt'>Doesn't standard data logging give you the precise
timing of stimulus presentation already, with its many time measurements? You
can use PreRelease to minimize OnsetDelay, and you can also set a CustomOnset/OffsetTime.
It's all in the Critical Timing chapter.<br>
<br>
Leisha Wharfield<br>
Decision Research<br>
<st1:place w:st="on"><st1:City w:st="on">Eugene</st1:City>, <st1:State w:st="on">Oregon</st1:State>
<st1:country-region w:st="on">USA</st1:country-region></st1:place><br>
<br>
David Hairston wrote:<br>
<br>
<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=black face=Arial><span style='font-size:
10.0pt;font-family:Arial'><u1:SmartTagType namespaceuri="urn:schemas-microsoft-com:office:smarttags" name="PostalCode"><u1:SmartTagType namespaceuri="urn:schemas-microsoft-com:office:smarttags" name="State"><u1:SmartTagType namespaceuri="urn:schemas-microsoft-com:office:smarttags" name="City"><u1:SmartTagType namespaceuri="urn:schemas-microsoft-com:office:smarttags" name="Street"><u1:SmartTagType namespaceuri="urn:schemas-microsoft-com:office:smarttags" name="address"><u1:SmartTagType namespaceuri="urn:schemas-microsoft-com:office:smarttags" name="place"><u1:SmartTagType namespaceuri="urn:schemas-microsoft-com:office:smarttags" name="PlaceType"><u1:SmartTagType namespaceuri="urn:schemas-microsoft-com:office:smarttags" name="PlaceName"></u1:SmartTagType></u1:SmartTagType></u1:SmartTagType></u1:SmartTagType></u1:SmartTagType></u1:SmartTagType></u1:SmartTagType></u1:SmartTagType>I
need to send a trigger signal denoting the exact time of stimulus presentation
(assuming parallel port is the easiest method).<u1:p></u1:p></span></font><o:p></o:p></p>
<p class=MsoNormal><font size=2 color=black face=Arial><span style='font-size:
10.0pt;font-family:Arial'>Here is the problem/question – in the event of,
say, a visual stimulus, what is the best way to get these as close in sync as
possible? I could have an inline code sending the trigger directly prior to an
ImageDisplay… but then it wouldn’t it at least have the delay
associated with waiting for the next screen update (could be up to 9ms if 100hz
monitor)?. Or – what about putting the inline right after said
presentation – would it actually occur immediately (like w/in a few ms)
afterwards?<u1:p></u1:p></span></font><o:p></o:p></p>
<p class=MsoNormal><font size=2 color=black face=Arial><span style='font-size:
10.0pt;font-family:Arial'>Or – is there a way to do it with a Slide
object?<u1:p></u1:p></span></font><o:p></o:p></p>
<p class=MsoNormal><font size=2 color=black face=Arial><span style='font-size:
10.0pt;font-family:Arial'>Unfortunately, this will be very difficult to test
out empirically…<u1:p></u1:p></span></font><o:p></o:p></p>
<p class=MsoNormal><font size=2 color=black face=Arial><span style='font-size:
10.0pt;font-family:Arial'><u1:p> </u1:p></span></font><o:p></o:p></p>
<p class=MsoNormal><font size=2 color=black face=Arial><span style='font-size:
10.0pt;font-family:Arial'>W. David Hairston, Ph.D.</span></font><u1:p></u1:p><o:p></o:p></p>
<p class=MsoNormal><font size=2 color=black face=Arial><span style='font-size:
10.0pt;font-family:Arial'>ANSIR Lab</span></font><u1:p></u1:p><o:p></o:p></p>
<p class=MsoNormal><font size=2 color=black face=Arial><span style='font-size:
10.0pt;font-family:Arial'>Dept of Radiology</span></font><u1:p></u1:p><o:p></o:p></p>
<p class=MsoNormal><st1:place u2:st="on"><st1:PlaceName u2:st="on"><st1:place
w:st="on"><st1:PlaceName w:st="on"><font size=2 color=black face=Arial><span
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size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'></st1:PlaceName>
<st1:PlaceType u2:st="on"><st1:PlaceType w:st="on">Forest</st1:PlaceType></st1:PlaceType>
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<st1:PlaceType u2:st="on"><st1:PlaceType w:st="on">School</st1:PlaceType></st1:PlaceType></span></font></st1:place></st1:place><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'> of Medicine</span></font><u1:p></u1:p><o:p></o:p></p>
<p class=MsoNormal><st1:Street u2:st="on"><st1:address u2:st="on"><st1:Street
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<p class=MsoNormal><st1:place u2:st="on"><st1:City u2:st="on"><st1:place w:st="on"><st1:City
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font-family:Arial'>Winston-Salem</span></font></st1:City><font size=2
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w:st="on">27157</st1:PostalCode></st1:PostalCode></span></font></st1:place></st1:place><u1:p></u1:p><o:p></o:p></p>
<p class=MsoNormal><font size=2 color=black face=Arial><span style='font-size:
10.0pt;font-family:Arial'>(336) 716-7160 (Offiice)</span></font><u1:p></u1:p><o:p></o:p></p>
<p class=MsoNormal><font size=2 color=black face=Arial><span style='font-size:
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style='font-size:12.0pt'><u1:p> </u1:p><o:p></o:p></span></font></p>
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