Hi Jan,
Are you suggestingt another modulation or another condition?
I have a collapsed condition including all trials and then using
parametric modulation to distinguish between them. If I add another
condition it will repeat some of the onset vectors of the first and
the betas will not be uniqely specified. At that point I am not sure
if parametric modulations would still be available for contrasting (or
correctly evaluated).
Dorian.
2009/2/5 Jan Gläscher <[log in to unmask]>:
> Hi Dorian,
>
> why not model those trials in a different regressor?
>
> Cheers,
> Jan
>
> Dorian P. wrote:
>> Hi SPM list,
>>
>> I made this question some time ago but still didn't get a response.
>>
>> I want to leave out some of the trials in a parametric modulation
>> regressor. Is there a way to do this?
>>
>> I would have thought to put "0" in the modulation of those trials but
>> it doesn't seem clever if the other values are "1", "2", "3", "4". It
>> may take the zero and use it in the modulation as simply less then
>> one.
>>
>> Any clue please?
>>
>> Dorian.
>> Ruhr University Bochum.
>>
>
> --
> Jan Gläscher, Ph.D. Div. Humanities & Social Sciences
> +1 (626) 395-3898 (office) Caltech, Broad Center, M/C 114-96
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