Hi,
> ROI name: Contrast value: t statistic: Uncorrected P: Corrected P
> ------------------------------------------
> memimagvsrestLparahipp: 411.10: 1.92: 0.028176: 0.028176
> imaginevsrestRhipp: 6.44: 2.14: 0.016536: 0.016536
> Could someone also explain in more detail exactly what the contrast value
> calculation entails? Is it merely the numerator of a T-statistic?
Sorry to be slow to reply, I've been travelling for a while. Yes, the
contrast value is the numerator of the t statistic. I'm not sure what
is causing the high contrast value... If the non-sphericity is the
problem, you could try the fmristat calculation instead:
http://marsbar.sourceforge.net/faq.html#fmristat
If you have a very large model with few degrees of freedom, the betas
can become unstable; you could try a smaller model and see what
effects you get.
Have you looked at the time course plot (Data-Plot(simple) to see if
there are any odd outliers?
Best,.
Matthew
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