> Dear all,
> I am trying to link activation and deactivation during
> an fMRI task with a covariate. The task has 2 conditions
> A and B and I have assessed activation (AB) and
> deactivation (A<B) during the task by using a one sample
> ttest as factorial design and entering 1 and -1
> respectively as contrast weights. I would like to see if
> the activation and/or deactivation is correlated to my
> covariate and if so in what way, that is positively or
> negatively correlated. I would use the factorial design
> of one sample ttest and enter the covariate, what are
> contrast weights I would have to enter to get positive
> and negative correlations between my covariate and
> activation and deactivation?
> I would be grateful for any kind of help on this.
> Thank you,