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<p>Hi Bence, <br>
</p>
<p>the baseline should go into FFT's 0 Hz frequency coefficient,
which is the mean of the analysis window<br>
</p>
<p>Best,</p>
<p> Jochem <br>
</p>
<p><br>
</p>
<div class="moz-cite-prefix">On 21.07.23 10:52, Bence Szaszkó via
fieldtrip wrote:<br>
</div>
<blockquote type="cite"
cite="mid:FF541F9C-0FD0-4FD8-B8D9-8FC8FF7CAD8E@univie.ac.at">
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<p style="line-height: 10.0pt; background: #D5EAFF;"><span
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font-family: 'Time new Roman';"> Diese E-Mail kommt von
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<div>Hello fellow FieldTrippers,
<div><br>
</div>
<div>I am analyzing steady-state data where I first had to
select the first 10s after a certain event and then, within
these 10s chunks, create regular epochs of 2s length using the
pop_regepoch function of EEGlab. I did the spectral analysis
with Fieldtrip and it went just fine; but now, I have to
perform time-frequency analysis of the first 2s of those 10s
chunks (so the first epoch in every chunk); however, due to
the limitations of pop_regepoch, I do not have a baseline, but
only the 2s, with time 0 being the time-locking stimulus.</div>
<div><br>
</div>
<div>So now, I cannot perform baseline correction on the data,
as I do not have a baseline. Do you have any idea how to
circumvent this? Keep in mind that the epoch before the epoch
in question is not the preceding epoch in time, so we cannot
use that unfortunately. Or is it okay to not correct the
baseline at all? </div>
<div><br>
</div>
<div>In the spectral analysis, I used a signal-to-noise ratio
instead of raw or log power, where I divided the raw power of
Frequency N through the sum of the raw powers of N-1, N-2, N+1
and N+2. Would this also work for the time-frequency domain,
doing this for each timepoint and channel?</div>
<div><br>
</div>
<div>Kind regards,</div>
<div>Bence<br>
<div>
<div dir="auto" style="caret-color: rgb(0, 0, 0); color:
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<div>-- <br>
Bence Szaszkó, BSc MA MSc</div>
<div>University Assistant (prae doc)</div>
<div><br>
Vienna Doctoral School CoBeNe </div>
<div>PhD Representative<br>
<br>
University of Vienna<br>
Faculty of Psychology<br>
Department of Cognition, Emotion, and Methods in
Psychology<br>
<br>
Liebiggasse 5<br>
A-1010 Wien/Vienna<br>
Austria<br>
<br>
e-mail: <a class="moz-txt-link-abbreviated" href="mailto:bence.szaszko@univie.ac.at">bence.szaszko@univie.ac.at</a></div>
</div>
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<br>
</div>
</div>
<br>
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</blockquote>
<pre class="moz-signature" cols="72">--
Jochem Rieger
Prof. Dr. rer. nat. habil.
Applied Neurocognitive Psychology
DFG Center for Open and Reproducible Neuroscience Tools
NFDI sections ELSA and metadata
Carl-von-Ossietzky University Oldenburg
Phone: +49 (0)441 798 4533
Web: <a class="moz-txt-link-freetext" href="https://urldefense.com/v3/__https://uol.de/en/applied-neurocognitive-psychology__;!!HJOPV4FYYWzcc1jazlU!9Bzx6HVQ7cy8U4Fj1_ryRhdJHyQaBAGLmgwK689LespfiAzk2bfiFCnkieek8JuJRjcInyWwwHqpkDnWdkXP7Lzdqjk0yUlU3dEX$">https://uol.de/en/applied-neurocognitive-psychology</a>
github: <a class="moz-txt-link-freetext" href="https://urldefense.com/v3/__https://github.com/ANCPLabOldenburg__;!!HJOPV4FYYWzcc1jazlU!9Bzx6HVQ7cy8U4Fj1_ryRhdJHyQaBAGLmgwK689LespfiAzk2bfiFCnkieek8JuJRjcInyWwwHqpkDnWdkXP7Lzdqjk0yQ_cVCVt$">https://github.com/ANCPLabOldenburg</a>
</pre>
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