(1) t-statistics don't follow a normal distribution; and (2) at the
group level you are comparing the amplitude of the BOLD response (beta
or con images) and not the significance of the BOLD response
(t-statistic). You could do the latter if you converted them to
z-scores; but again, the question is dramatically different.
Best Regards, Donald McLaren
=================
D.G. McLaren, Ph.D.
Postdoctoral Research Fellow, GRECC, Bedford VA
Research Fellow, Department of Neurology, Massachusetts General
Hospital and Harvard Medical School
Office: (773) 406-2464
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On Mon, Sep 20, 2010 at 6:12 PM, Mary Beth <[log in to unmask]> wrote:
> Hi all,
>
> I was just wondering if there is a reason (or a reference explaining why)
> people don't input t-statistics to group level correlation analyses.
>
> thanks in advance!
>
>
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