[Mne_analysis] Theta/Alpha band induced power

Alexandre Gramfort alexandre.gramfort at telecom-paristech.fr
Tue Nov 22 04:46:45 EST 2016
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2 things:
- you loose temporal resolution by looking at frequency content. In
other words, the peak will spread
in time (backward and forward)
- the mne code does not fix edge artifacts. So you need to crop the
output to get rid of it, depending
on the number of cycles you used.


On Tue, Nov 22, 2016 at 4:40 AM, Rezvan Farahi <rezvan.farahi at gmail.com> wrote:
> Hi all,
> A quick question, in the whole brain induced power computation on the
> example dataset (below), I wodered if the onset of the main peak is before
> 0ms.
> 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
> So, tested lower frequency bands (theta 4-8Hz and alpha 8-12Hz) the result
> of which is attached. It seems as if the onset of the main peak of theta
> starts around -50ms and alpha -30ms. Was wondering if someone might have
> thoughts on this (as looks a bit odd to me)?
> Thanks
> Rezvan
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