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<div class="moz-cite-prefix">Hi Bart,<br>
<br>
it might help if you paste the code that you are using for
computing the FFT and for plotting. Also, showing the structure
(e.g. fieldnames and size of the content) might help. <br>
Generally, the problem could just be related to huge 1/f noise and
that you need to zoom in to see modulations of higher frequencies.
Hard to tell though without any further information on what you
are exactly doing ;)<br>
<br>
Best,<br>
Jörn<br>
<br>
On 10/12/2013 6:15 PM, Bart Michiels wrote:<br>
</div>
<blockquote
cite="mid:CALpw9_r0eBp_f27SnBdbxZ9oKDW6HnkfR2bMqxP7eo4b0CxE5w@mail.gmail.com"
type="cite">
<div dir="ltr">After using ft_freqanalysis for EEG resting-state
data I am unable to see the whole spectrum of my data, which
should show some content between 0 and 60 Hz. I only see some
low-frequency content (between 0 and 8 Hz) when using plot(...).
<div>
<br>
</div>
<div>Pre-processing steps:</div>
<div>
<div style="font-family:arial,sans-serif;font-size:13px">Avg
re-reference, BP filter 0.25-100, cut continuous data into
4s segments, resample data to 512 Hz, detrend, re-reference
(after avg rereferencing) to the A1&A2 electrode,
Artefact rejection (max=80,min=-80,range=160, default jump
artefact algorithm), visual inspection of the data. There
are three datasets of 1 patients (every dataset cut into 4s
segments). After preprocessing, those data sets are merged
with ft.appenddata.</div>
<div style="font-family:arial,sans-serif;font-size:13px"><br>
</div>
<div style="font-family:arial,sans-serif;font-size:13px">I
tried everything (wavelet, multi-taper), I always have the
same result, can someone tell me what I am doing wrong?</div>
<div><br>
</div>
<div dir="ltr">
<div style="color:rgb(136,136,136)">Bart Michiels, Research
Assistant.<br>
</div>
</div>
</div>
</div>
<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
FieldTrip Development Team
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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