Dear SPMers,
I have a simple question regarding the contrast vector in the GLM. I
have a single subject dataset where the subject periodically (20 s
activity, 20 s rest) performed a task. As regressors I use the square
wave paradigm convolved with the heamodynamic response function
(difference of gammas) and it's temporal derivative. Should the contrast
vector be [1 -1], [1 0] or something else?
/Anders
|