[FieldTrip] averaging FT_FREQANALYSIS.

[Stephen Whitmarsh]

Dear Fanny,

You should be able to do all that within ft_freqanalysis directly. I advice
you to read the relevant documentation in the tutorials, and walkthrough,
on the FT site.

To answer your question more directly, however, its helpfull to know the
cfg you called ft_freqanalysis with and the datastructure you end up with.

I'm guessing you used method = 'mtmconvol'? If interested in a single
timewindow you could use method = 'fft', for instance.

Specifing a specific frequency band is possible by adding tapers to your
frequency of interest (as explained in the documentation).

Alternatively, you can use ft_selectdata using 'avgoverfreq' and
'avgovertime' parameters after you did freqanalysis. That might be a quick
(but dirty) solution as well.

Hope that helps for now,
Stephen

On 28 November 2012 16:27, Fanny <fanny.lachat at gmail.com> wrote:

> Dear Fieldtrip Users,
>
> I have analysed my EEG data using FT_FREQANALYSIS<http://fieldtrip.fcdonders.nl/reference/ft_freqanalysis>.
>
>
> I am now  interested in averaging this time frequency data for each
> subject and each electrode  on particular frequency (for example between 8
> & 13 Hz) and on particular time (between for example  1sec & 1.2 sec).
>
> My goal is to have for each suject
> -for the powspctrm only the values that correspond to the results of this
> average.
> -for the time and for the freq only 1 number
>
> I will alos want to plot the results after. (using ft_topoplotTFR).
>
> I have failed to find how to do that. I have tryed many different
> methods.  I even tried calling cfg.method    = 'stats';
> cfg.statistic = 'mean';
> ....
>
> Could someone help me ?
>
> thank you in advance
>
>
> ------
> Fanny
>
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