Dear all,
I read some fMRI papers using parametric modulations with quadratic modelisation and I just wonder what kind of contrasts they used.
Does a [0 0 1] at the 1st level analysis (with the « 1 » onto the 2nd ordered pmod) and a « 1 » t contrast in a one-sample t test at 2nd level analysis modeled a u-shaped quadratic effect or an inverted u-shaped one ?
Regards,
Alexandre Obert
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