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Dear Ivano,<br>
<br>
I am forwarding your message and my reply to the discussion list
again, so that others might benefit or add information.<br>
What you see looks to me pretty much like a filter artifact, which
is common to occur at the edges of your signal. In order to reduce
these, you can think of changing the order of your filter or, more
ideal in my opinion, use filterpadding. You can either let FieldTrip
do that by specifying cfg.padding or by defining your trials in a
wider range (e.g. add 1s pre and post time of interest) and then
only plot the time of interest, with the knowledge that the 1s
padding before and after is corrupted by filter artifacts.<br>
<br>
Best,<br>
Jörn<br>
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<th align="RIGHT" nowrap="nowrap" valign="BASELINE">Subject:
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<td>Re: [FieldTrip] band pass and segmentation</td>
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<th align="RIGHT" nowrap="nowrap" valign="BASELINE">Date: </th>
<td>Mon, 9 Jul 2012 11:01:08 +0100 (BST)</td>
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<th align="RIGHT" nowrap="nowrap" valign="BASELINE">From: </th>
<td>Ivano Triggiani <a class="moz-txt-link-rfc2396E" href="mailto:ivano_triggiani@yahoo.it"><ivano_triggiani@yahoo.it></a></td>
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<th align="RIGHT" nowrap="nowrap" valign="BASELINE">Reply-To:
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<td>Ivano Triggiani <a class="moz-txt-link-rfc2396E" href="mailto:ivano_triggiani@yahoo.it"><ivano_triggiani@yahoo.it></a></td>
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<th align="RIGHT" nowrap="nowrap" valign="BASELINE">To: </th>
<td>"Jörn M. Horschig" <a class="moz-txt-link-rfc2396E" href="mailto:jm.horschig@donders.ru.nl"><jm.horschig@donders.ru.nl></a></td>
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<div style="color:#000; background-color:#fff; font-family:arial,
helvetica, sans-serif;font-size:10pt">
<div><span>Hi Jorn,</span></div>
<div><br>
<span></span></div>
<div><span>in attach an example. you can see in the third slide
on the right the channel that "goes down".</span></div>
<div><span>Thanks, <br>
</span></div>
<div><span>Ivano</span></div>
<div> </div>
<div>------------------------------------------------------------------------<br>
<br>
<br>
<br>
</div>
<div>"No man can wear one face to himself <br>
and another to the multitude,<br>
without finally getting bewildered <br>
as to which one is true."</div>
<br>
<br>
<div>Nathaniel Hawthorne<br>
<div style="font-family: arial, helvetica, sans-serif;
font-size: 10pt;">
<div style="font-family: times new roman, new york, times,
serif; font-size: 12pt;">
<div dir="ltr"> <font face="Arial" size="2">
<hr size="1"> <b><span style="font-weight:bold;">Da:</span></b>
""Jörn M. Horschig"" <a class="moz-txt-link-rfc2396E" href="mailto:jm.horschig@donders.ru.nl"><jm.horschig@donders.ru.nl></a><br>
<b><span style="font-weight: bold;">A:</span></b>
Ivano Triggiani <a class="moz-txt-link-rfc2396E" href="mailto:ivano_triggiani@yahoo.it"><ivano_triggiani@yahoo.it></a>;
FieldTrip discussion list
<a class="moz-txt-link-rfc2396E" href="mailto:fieldtrip@science.ru.nl"><fieldtrip@science.ru.nl></a> <br>
<b><span style="font-weight: bold;">Inviato:</span></b>
Lunedì 9 Luglio 2012 11:48<br>
<b><span style="font-weight: bold;">Oggetto:</span></b>
Re: [FieldTrip] band pass and segmentation<br>
</font> </div>
<br>
<div id="yiv2033807883">
<div>
<div class="yiv2033807883moz-cite-prefix">Hi Ivano,<br>
<br>
I don't understand your request exactly, could you
attach an example figure and explain your issue by
using that? Then I (or someone else) might be able
to help you out.<br>
<br>
Best,<br>
Jörn<br>
<br>
On 7/3/2012 5:42 PM, Ivano Triggiani wrote:<br>
</div>
<blockquote type="cite">
<div
style="color:#000;background-color:#fff;font-family:arial,
helvetica, sans-serif;font-size:10pt;">
<div><span>Hi all,</span></div>
<div><br>
<span></span></div>
<div> </div>
<div class="yiv2033807883MsoNormal"><span style=""
lang="EN-US">I tried to use a simple
cfg.bpfilter (0.1 - 40) for an EEG that I
divide into 2 secs époques and giving a look
it seems that at the board of every window the
signal is reduced (just like following a
parabolic trend). Is this a problem of the
brutal segmentation (respect to a good
windowing) or there's something else?</span></div>
<div class="yiv2033807883MsoNormal"><br>
<span style="" lang="EN-US"></span></div>
<div class="yiv2033807883MsoNormal"><span style=""
lang="EN-US">Ivano<br>
</span></div>
<div> </div>
<br>
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sans-serif;font-size:10pt;"> </div>
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<br>
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<br>
<br>
<pre class="yiv2033807883moz-signature">--
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 moz-do-not-send="true" rel="nofollow" class="yiv2033807883moz-txt-link-abbreviated" ymailto="mailto:jm.horschig@donders.ru.nl" target="_blank" href="mailto:jm.horschig@donders.ru.nl">jm.horschig@donders.ru.nl</a>
Tel: +31-(0)24-36-68493
Web: <a moz-do-not-send="true" rel="nofollow" class="yiv2033807883moz-txt-link-freetext" target="_blank" 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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