[FieldTrip] Time-frequency analysis: based on single trials or on average?

[Eelke Spaak]

Hi Guido,

The FieldTrip method that performs time-frequency analyses is called
ft_freqanalysis. By default, ft_freqanalysis gives you power averaged
over trials as output. You can easily override this default behaviour
by specifying cfg.keeptrials='yes', you will then get a power estimate
for each individual trial.

You might want to take a look at the following tutorial, which covers
the basics of how to do time-frequency analysis in FieldTrip:
http://fieldtrip.fcdonders.nl/tutorial/timefrequencyanalysis

The reference documentation for ft_freqanalysis also might be of use:
http://fieldtrip.fcdonders.nl/reference/ft_freqanalysis (which is the
same information you get when you type 'help ft_freqanalysis' or 'doc
ft_freqanalysis' at the matlab prompt).

Hope this was of help.

Best,
Eelke

2011/12/14 Guido Hesselmann <g.hesselmann at gmail.com>:
> Hi all,
>
> I am new to fieldtrip and have a very simple question. I have EEG data and
> would like to run a
> time-frequency analysis (e.g., using a Hanning taper with fixed window
> length). If I have 100 trials,
> how is this analysis performed? On a trial-by-trial basis, or based on the
> average? Can I choose
> between these options in fieldtrip?
>
> Thanks a lot!
>
> Guido Hesselmann
> Visual Perception Lab
> Department of Psychiatry & Psychotherapy
> Charité Berlin
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