Thanks Alex,<div>Yes, hadn't cropped this example.<br><div>But my point concerns the first reason you mentioned. However, I would have thought that the peak spreading won't include prestimulus times this obviously and made me think that perhaps this is due to the implementation. Thanks a lot for reassuring that this looks normal to you.</div><div><br></div><div>Best</div><div>Rezvan</div><div><br></div><div><br><br>On Tuesday, November 22, 2016, Alexandre Gramfort <<a href="mailto:alexandre.gramfort@telecom-paristech.fr">alexandre.gramfort@telecom-paristech.fr</a>> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">hi,<br>
<br>
2 things:<br>
- you loose temporal resolution by looking at frequency content. In<br>
other words, the peak will spread<br>
in time (backward and forward)<br>
- the mne code does not fix edge artifacts. So you need to crop the<br>
output to get rid of it, depending<br>
on the number of cycles you used.<br>
<br>
HTH<br>
Alex<br>
<br>
On Tue, Nov 22, 2016 at 4:40 AM, Rezvan Farahi <<a href="javascript:;" onclick="_e(event, 'cvml', 'rezvan.farahi@gmail.com')">rezvan.farahi@gmail.com</a>> wrote:<br>
> Hi all,<br>
> A quick question, in the whole brain induced power computation on the<br>
> example dataset (below), I wodered if the onset of the main peak is before<br>
> 0ms.<br>
> <a href="http://martinos.org/mne/stable/auto_examples/time_frequency/plot_source_space_time_frequency.html#sphx-glr-auto-examples-time-frequency-plot-source-space-time-frequency-py" target="_blank">http://martinos.org/mne/<wbr>stable/auto_examples/time_<wbr>frequency/plot_source_space_<wbr>time_frequency.html#sphx-glr-<wbr>auto-examples-time-frequency-<wbr>plot-source-space-time-<wbr>frequency-py</a><br>
><br>
> So, tested lower frequency bands (theta 4-8Hz and alpha 8-12Hz) the result<br>
> of which is attached. It seems as if the onset of the main peak of theta<br>
> starts around -50ms and alpha -30ms. Was wondering if someone might have<br>
> thoughts on this (as looks a bit odd to me)?<br>
><br>
> Thanks<br>
> Rezvan<br>
><br>
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</blockquote></div></div>