Dear SPMers,
I'm aware that the F-test is non-directional and tests for positive or negative differences between conditions. But the F-contrast [1 -1; 1 -1] should test where condition A is greater than condition B, shouldn't it? So it doesn't really test for negative differences...
Also, why is the F-contrast [1 -1; 1 -1] not giving the same result as the t-contrast [1 -1] in a first level analysis?
Thank you in advance,
Angela
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