On Tue, 6 Sep 2005 14:22:33 +0100, Nicole David <[log in to unmask]>
wrote:
>Hi all,
>I have a question about the 2nd level basic-models regression/correlation
>option.
>
>Say I have two conditions A & B and I want to look at A-B and covary with
>accuracy. So, I take the first level con-img for A-B and enter my accuracy
>vector. In the contrast manager, I make a "1" contrast. Am I correct to
>assume that the resulting activation is in brain regions that vary with
>accuracy, e.g. the better people are the more they recruit these ragions?
>
>Is there a direction of this correlation, postive or negative?
>
>What if I type "-1" in the contrast manager, do I then get a negative
>correlation or do I get results for B-A? I assume it is the latter...
A negative correlation with A-B is the same thing as a positive
correlation with B-A.
>
>Thanks,
>Nicole
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