Dear Guillaume,
thank you very much for your quick reply, this helps me very much!
Best regards,
Marco
> On 16 Nov 2016, at 17:39, Guillaume Flandin <[log in to unmask]> wrote:
>
> Dear Marco,
>
> It does the same thing. It's actually described as a comment in
> spm_peb_ppi.m:
>
> % if tmpw==0 then don't include the column in the
> % design. This takes care of the possibility that the
> % user would select to include the column but then give
> % it a 0 weight.
>
> Best regards,
> Guillaume.
>
>
> On 16/11/16 16:00, Marco Caviezel wrote:
>> Dear SPMers,
>>
>> I’m trying to do a PPI analysis of an event-related design.
>> After clicking on the “PPIs-Button”, I specified the SPM file on single subject level and chose psychophysiologic interaction.
>> As physiological variable I have chosen my VOI-file I generated before.
>> Now I can chose which contrasts from the SPM-file, I would like to include in my PPI model.
>> My question is, if it makes a difference if I click “No” for a specific contrast or if I click “Yes” and set the contrast weight to 0?
>> Until now I couldn’t find any recommendations which is the better way for calculating a PPI model.
>>
>> Is there anybody who has an idea about this issue?
>>
>> Thank you and best regards
>>
>> Marco
>>
>
> --
> Guillaume Flandin, PhD
> Wellcome Trust Centre for Neuroimaging
> University College London
> 12 Queen Square
> London WC1N 3BG
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