[FieldTrip] keeptrials = 'yes' with DICS does not keep trials

[Lorenzo Magazzini]

Hi Stephen,

Perhaps you could try to add the option cfg.rawtrial = 'yes'.

I'm not entirely sure, but maybe by using a precomputed filter, the same
filter is applied to each single trial separately (rather than constructing
a different filter individually for each trial, which I guess is not what
you want to do).

Lorenzo



Lorenzo Magazzini, PhD

Research Associate

CUBRIC

Cardiff University

Cardiff CF24 4HQ

Tel: +44 (0)2920 870090

*http://psych.cf.ac.uk/contactsandpeople/magazzinil.php
<http://psych.cf.ac.uk/contactsandpeople/magazzinil.php>*




On 4 July 2017 at 17:03, Stephen Whitmarsh <stephen.whitmarsh at gmail.com>
wrote:

> Hi everyone,
>
> I am now trying to use the DICS method for sourceanalysis, with
> 'powandcsd' output from ft_freqanalysis as its input and using a
> precomputed filter and leadfield. However, I would like to keep my separate
> trial estimates in the final source analysis, and while the documentation
> suggests I should be able to get that with cfg.keeptrials, but this doesn't
> have the expected effect.
>
> I previously made workaround using PCC on fourier data instead (see
> below), I think to deal with this issue. I was wondering if this is still
> the recommended option, i.e. workaround? Alternatively, and perhaps
> preferably, would someone have a suggestion for a solution consistent with
> the DICS implementation?
>
> Thanks for your time,
> Stephen
>
> % source analysis
> cfg.method           = 'pcc';
> ...
> cfg.keeptrials       = 'yes';
> cfg.pcc.keepmom      = 'yes';
> cfg.pcc.fixedori     = 'no';
> source_control       = ft_sourceanalysis(cfg, FFT);
>
> and then:
>
> % project moment and tapers
> cfg = [];
> cfg.projectmom = 'no';
> cfg.keeptrials = 'yes';
> cfg.powmethod  = 'lambda1';
> source         = ft_sourcedescriptives(cfg,source);
>
>
>
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