„ Simple or Fixed-shape
regression:
H We fixed the shape of the HRF
H Used waver to generate the signal model
from the stimulus timing
H Found the amplitude of the signal model
in each voxel
„ Deconvolution or
Variable-shape regression:
H We allow the shape of the HRF to vary in
each voxel, for each stimulus
class
H Appropriate when you donÕt want to over-constrain the solution by
assuming an HRF shape
H Caveat: need
to have enough time points during the HRF in order to
resolve its shape