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<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=013172518-19062006>Dave,</SPAN></FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=013172518-19062006></SPAN></FONT> </DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN class=013172518-19062006>Use
the onsetsignal enabled property of the stimulus to send your trigger. We
use a photo-diode in addition to that to adjust the timing jitter on the LCD
projector. The photo-diode won't give you multiple trigger codes without a
lot of painful hardware tinkering, but you can probably use whatever software
you have offline to combine the e-prime trigger and the photo-diode signal to
achieve what you need. What MEG system do you use? If you have a 4D
Magnes system, I can probably be of further help to you with respect to the
latter suggestion.</SPAN></FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=013172518-19062006></SPAN></FONT> </DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN class=013172518-19062006>Donald
C. Rojas, Ph.D.</SPAN></FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN class=013172518-19062006>U. of
Colorado Neuromagnetism Lab</SPAN></FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=013172518-19062006>Denver, CO USA</SPAN></FONT></DIV>
<BLOCKQUOTE dir=ltr
style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #0000ff 2px solid; MARGIN-RIGHT: 0px">
<DIV></DIV>
<DIV class=OutlookMessageHeader lang=en-us dir=ltr align=left><FONT
face=Tahoma size=2>-----Original Message-----<BR><B>From:</B>
eprime@mail.talkbank.org [mailto:eprime@mail.talkbank.org] <B>On Behalf Of
</B>David Hairston<BR><B>Sent:</B> Monday, June 19, 2006 10:35
AM<BR><B>To:</B> Leisha Wharfield<BR><B>Cc:</B>
eprime@mail.talkbank.org<BR><B>Subject:</B> RE: synchronized trigger and stim
presentation<BR><BR></FONT></DIV>
<DIV class=Section1>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">Thanks Leisha. Maybe
I should clarify. <o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">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 face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">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 face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">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 face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">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 face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">Thanks,<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">Dave<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial"><o:p> </o:p></SPAN></FONT></P>
<DIV>
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<P class=MsoNormal><B><FONT face=Tahoma color=black size=2><SPAN
style="FONT-WEIGHT: bold; FONT-SIZE: 10pt; COLOR: windowtext; FONT-FAMILY: Tahoma">From:</SPAN></FONT></B><FONT
face=Tahoma color=black size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: windowtext; FONT-FAMILY: Tahoma">
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 face="Times New Roman" color=black size=3><SPAN
style="FONT-SIZE: 12pt"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face="Times New Roman" color=black size=3><SPAN
style="FONT-SIZE: 12pt">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 face=Arial color=black size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><U1:SMARTTAGTYPE name="PostalCode"
namespaceuri="urn:schemas-microsoft-com:office:smarttags"><U1:SMARTTAGTYPE
name="State"
namespaceuri="urn:schemas-microsoft-com:office:smarttags"><U1:SMARTTAGTYPE
name="City"
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name="Street"
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name="address"
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name="place"
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name="PlaceType"
namespaceuri="urn:schemas-microsoft-com:office:smarttags"><U1:SMARTTAGTYPE
name="PlaceName"
namespaceuri="urn:schemas-microsoft-com:office:smarttags"></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 face=Arial color=black size=2><SPAN
style="FONT-SIZE: 10pt; 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 face=Arial color=black size=2><SPAN
style="FONT-SIZE: 10pt; 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 face=Arial color=black size=2><SPAN
style="FONT-SIZE: 10pt; 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 face=Arial color=black size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><U1:P> </U1:P></SPAN></FONT><o:p></o:p></P>
<P class=MsoNormal><FONT face=Arial color=black size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">W. David Hairston,
Ph.D.</SPAN></FONT><U1:P></U1:P><o:p></o:p></P>
<P class=MsoNormal><FONT face=Arial color=black size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">ANSIR
Lab</SPAN></FONT><U1:P></U1:P><o:p></o:p></P>
<P class=MsoNormal><FONT face=Arial color=black size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Dept of
Radiology</SPAN></FONT><U1:P></U1:P><o:p></o:p></P>
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