„ 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 However, need to have enough time points
during the HRF in order to
resolve its shape