[FieldTrip] Power analysis of resting state data

[Eelke Spaak]

Hi Beth,

This sounds like a bug to me. There definitely should be more than one
channel in your data structure, if the original dataset has 275.

Could you check what happens when you call ft_preprocessing with no
filter options etc., so just the following:

cfg = [];
cfg.dataset = 'dataset';
data = ft_preprocessing(cfg);

Also, could you check whether the code you provided (so including the
filter options again) does return anything if you leave out the
'cfg.continuous' option?

Best,
Eelke


2011/7/27 Belluscio, Beth (NIH/NINDS) [E] <BelluscB at ninds.nih.gov>:
> Hi Fieldtrip users-
>
>   I am interested in calculating the Power of different frequency bands at
> each channel or in groups of channels during resting state.
>
>
>
>  Since I don’t have trials per se, and actually no triggers with which to
> define a period of time for analysis, I did not call ft_definetrial.
> Rather, I used ft_preprocessing with the information I usually put into
> ft_definetrial, including:
>
>                 cfg.dataset = ‘dataset’;
>
>                 cfg.channel = {‘MEG’};
>
>                 cfg.continuous = ‘yes’;
>
>                 cfg.detrend = ‘yes’;
>
>                 cfg.dftfilter = ‘yes’;
>
>                 cfg.dftfreq = [60 120 180];
>
>                cfg.method = ‘channel’;
>
>                 Data = ft_preprocessing(cfg)
>
> The command window then indicates that it is processing each of the 275
> channels.
>
> However, the output says:
>
>                 Data =
>
>                                 hdr: [1x1 struct]
>
>                                 label: {‘MZP01’}
>
>                                 time: {[1x21600 double]}
>
>                                 trial: {[1x21600 double]}
>
>                                 fsample: 1200
>
>                                 sampleinfo: [1 21600]
>
>                                 grad: [1x1 struct]
>
>                                 cfg: [1x1 struct]
>
>
>
> Calling ft_freqanalysis after that does a nice job of giving me the Power of
> frequency bands specified for one channel, which I assume is MZP01.
>
>
>
> Is there a way for me to do this and generate a matrix with such a
> calculation for each channel (eg 275x20)?
>
> Is there a way to specify groups of channels in a customized way, without
> relying on their names (I don’t just want all Occipital, all Parietal, etc)?
>
>
>
> Thanks in advance for your help.
>
> Beth.
>
>
>
>
>
> Beth Belluscio MD-PhD
>
> Clinical Fellow
>
> Human Motor Control Section
>
> NINDS, NIH
>
> 301-402-3495
>
>
>
> _______________________________________________
> fieldtrip mailing list
> fieldtrip at donders.ru.nl
> http://mailman.science.ru.nl/mailman/listinfo/fieldtrip
>