[Eeglablist] Time-frequency decomposition for slow frequencies

[Tarik S Bel-Bahar]

Hello Alberto, Hope this helps you a bit. Longer epochs should be useful
here, try to shoot a minimum of 4 cycles of your lowest frequency of
interest, thus using -2 to 4 seconds epochs, if possible. There are range
of solutions here, please consider Mike Cohen's book on Time-Frequency
analysis, which has lucid chapters on various issues in TF analyses. If you
have not had a chance to, please tweak a range of settings in eeglab's
newtimef function to reach your goal. The winlen flag on newtimef may also
be of use in setting the lowest frequency, see:
sccn.ucsd.edu/wiki/Chapter_11:_Time/Frequency_decomposition


On Thu, Feb 19, 2015 at 8:04 AM, Alberto <vilanova5 at hotmail.com> wrote:

> Dear eeglabers,
>
> I have -1s to 2s epochs, and I want to do time-frequency decomposition
> from 1Hz to 30Hz. I prefer to use a Morlet wavelet to convolve the data,
> but an important part of the epoch is missed because of the power stimation
> of <4Hz frequencies. What do you suggest to solve this issue?. Create
> larger epochs doing EEG.data =  [EEG.data(:,end:-1:1,:) EEG.data
> EEG.data(:,end:-1:1,:)];.  Zero-padding?
>
>
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