Manish
I believe the average global signal is scaled to 100.
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Darren Gitelman
On Mon, Jun 1, 2009 at 12:01 PM, Manish Dalwani <[log in to unmask]> wrote:
> Hi SPM'ers,
>
> If I have a contrast Condition A - Condition B (note condition B is not a
> resting state baseline), and SPM scales the baseline to 100 as per mean
> global intensity (that includes gray and white matter).
>
> Does it scale the condition B as baseline to 100 or does it first compare
> each condition to an implicit baseline and then compare the 2 conditions.
> (So let’s say condition A could be 101 and condition B could be 102).
>
> If the latter is true then where does it get it's implicit baseline from?
>
> Regards,
> Manish Dalwani
> Sr. PRA
> Dept. of Psychiatry
> Univ of CO Denver
>
>
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