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

Stephen Whitmarsh stephen.whitmarsh at gmail.com
Tue Jul 4 18:51:47 CEST 2017


Hi Lorenzo,

Thanks, I will give it a try tomorrow, but the documentation suggest that
it's not what I want: Just for clarity, I would like to use the same filter
on separate trials.

Best wishes,
Stephen

On 4 July 2017 at 18:32, Lorenzo Magazzini <magazzinil at gmail.com> wrote:

> 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 <+44%2029%202087%200090>
>
> *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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>>
>
>
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