Dear Friends:
I'm trying to use SPM2 to assess the correlations between behavioral
performance and brain activity. I press following buttons:
Basic Models --> Simple Regression (correlation) -> select con images -->
enter RT of each subjects. Then estimate the matrix.
I have two columns in the design matrix. The first column corresponds to the
con images and the second column correspond to the RT.
What should I enter in the contrast manager for positive and negative
correlations, respectively? [1 -1] and [-1 1], or [1 0] and [-1 0].
Thanks
Jiansong
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