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Dear Tara,<br>
<br>
you define cfg.trialdef.triallength prior to calling ft_definetrial.
This will cause the trialfunction to not look for events, but cut
your recorded data into chunks of 3 seconds, independently of the
eventtype and -value that you specified. The parameters you probably
want to use instead are cfg.trialdef.poststim and .prestim.
Triallength is supposed for continuous data without events, e.g.
resting state data. <br>
<br>
Btw, if you specifiy cfg.trialdef.eventtype='?' you will get a list
with all events in your data - that way you can make sure that you
are specifying the correct types or values (alternatively, you could
also use ft_read_event).<br>
<br>
Hope it helps!<br>
Best,<br>
Jörn<br>
<br>
On 1/19/2012 10:12 PM, Tara Jacobson wrote:
<blockquote
cite="mid:CA+yWUj7BcY_40Z=45S0aKPgZaON9Bsx37WtoFiJpzsNvfD+KPA@mail.gmail.com"
type="cite">Hello,
<div><br>
</div>
<div>Does anyone have experience with .nex files? It seems
straight forward to be able to define trials using events in the
.nex, but ft_definetrial is not recognizing them as events.</div>
<div><br>
</div>
<div>
<div>filename =('11-087_12292011.nex')</div>
<div><br>
</div>
<div><br>
</div>
<div>stim30Hz=[27.25275<span class="Apple-tab-span"
style="white-space:pre"> </span>159.26715<span
class="Apple-tab-span" style="white-space:pre"> </span>258.277925<span
class="Apple-tab-span" style="white-space:pre"> </span>357.2887<span
class="Apple-tab-span" style="white-space:pre"> </span>489.303075<span
class="Apple-tab-span" style="white-space:pre"> </span>522.306625<span
class="Apple-tab-span" style="white-space:pre"> </span>621.317425<span
class="Apple-tab-span" style="white-space:pre"> </span>786.335425<span
class="Apple-tab-span" style="white-space:pre"> </span>885.3462<span
class="Apple-tab-span" style="white-space:pre"> </span>984.356975<span
class="Apple-tab-span" style="white-space:pre"> </span>1083.36775<span
class="Apple-tab-span" style="white-space:pre"> </span>1149.3749<span
class="Apple-tab-span" style="white-space:pre"> </span>1281.3893<span
class="Apple-tab-span" style="white-space:pre"> </span>1347.396425<span
class="Apple-tab-span" style="white-space:pre"> </span>1446.40725<span
class="Apple-tab-span" style="white-space:pre"> </span>1578.4216<span
class="Apple-tab-span" style="white-space:pre"> </span>1644.4288<span
class="Apple-tab-span" style="white-space:pre"> </span>1776.443175<span
class="Apple-tab-span" style="white-space:pre"> </span>1875.45395<span
class="Apple-tab-span" style="white-space:pre"> </span>1974.464725];</div>
<div><br>
</div>
<div>cfg = [];</div>
<div>cfg.dataset = filename;</div>
<div><br>
</div>
<div>cfg.trialdef.triallength=3;</div>
<div>cfg.trialdef.eventtype=('Event007');</div>
<div>cfg.trialdef.eventvalue=stim30Hz;</div>
<div><br>
</div>
<div>cfg=ft_definetrial(cfg);</div>
<div><br>
</div>
<div><font class="Apple-style-span" color="#ff0000">filename =</font></div>
<div><font class="Apple-style-span" color="#ff0000">11-087_12292011.nex</font></div>
<div><font class="Apple-style-span" color="#ff0000">Warning: no
trialfun was specified, using trialfun_general </font></div>
<div><font class="Apple-style-span" color="#ff0000">> In
ft_definetrial at 95</font></div>
<div>
<font class="Apple-style-span" color="#ff0000">evaluating
trialfunction 'trialfun_general'</font></div>
<div><font class="Apple-style-span" color="#ff0000">reading the
events from '11-087_12292011.nex'</font></div>
<div><font class="Apple-style-span" color="#ff0000">found 0
events</font></div>
<div><font class="Apple-style-span" color="#ff0000">created 676
trials</font></div>
</div>
<div><br>
</div>
<div>My question is what are the 676 trials if it found no
events? </div>
<div><br>
</div>
<div>Can anyone give me some advice?</div>
<div><br>
</div>
<div><br>
</div>
<div>Thanks very much.</div>
<div><br>
</div>
<div><br>
</div>
<br>
<fieldset class="mimeAttachmentHeader"></fieldset>
<br>
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</blockquote>
<br>
<br>
<pre class="moz-signature" cols="72">--
Jörn M. Horschig
PhD Student
Donders Institute for Brain, Cognition and Behaviour
Centre for Cognitive Neuroimaging
Radboud University Nijmegen
Neuronal Oscillations Group
P.O. Box 9101
NL-6500 HB Nijmegen
The Netherlands
Contact:
E-Mail: <a class="moz-txt-link-abbreviated" href="mailto:jm.horschig@donders.ru.nl">jm.horschig@donders.ru.nl</a>
Tel: +31-(0)24-36-68493
Web: <a class="moz-txt-link-freetext" href="http://www.ru.nl/donders">http://www.ru.nl/donders</a>
Visiting address:
Trigon, room 2.30
Kapittelweg 29
NL-6525 EN Nijmegen
The Netherlands</pre>
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