Dear Mark,
Is it one score for each subject or for each trial? If it is only one
score for each subject and you assume that the HRF amplitudes scales with
that, you could perhaps try out your weighting in a 2nd level analysis.
Best regards,
Karsten
Den 07.03.13 18:57 skrev "Mark" <[log in to unmask]>:
>Hi SPM experts,
>
>I want to specify the first-level model in SPM in my subjects. When I
>choose “specify 1st level” in SPM, I am requested to input the onset and
>duration for the condition(i.e. EV) (only one condition in this
>experiment). However, each of my subjects has an individual biological
>score and I want to “weigh” individual activation with this score. So,
>where can I input the score in SPM gui (parametric modulation?)?
>
>(In FSL, I can choose 3 column format to define each condition. The first
>and second columns specify onset and duration, respectively, and I can
>input the scores in the third column.)
>
>Thanks.
>
>Mark
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