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

[Stephen Whitmarsh]

Hi Wanze,

Sorry to hear you didn't get a response last year, but thanks for sharing
yours! Indeed, that seems to be the most elegant work-around to me as well.
I'll probably do that. Thanks!

Stephen

On 4 July 2017 at 19:38, Xie Wanze <xiew1202 at gmail.com> wrote:

> I mean manually calculated the filter with ft source analysis. Sorry for
> my typo in my last email.
>
> Good luck.
>
> Wanze
> Stephen Whitmarsh <stephen.whitmarsh at gmail.com>于2017年7月4日 周二上午9:52写道：
>
>> 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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>>
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