Fig. 2.
Single parcel (
) artificial data generation process using two experimental conditions (M = 2). From left to right: label maps q
m
are hand-drawn. Conditionally on them, NRL values {
, j ∈
} are drawn from Gaussian distributions with means μim
and variances vim
whenever
. Then, for any given voxel j, the stimulus sequence of a given experimental condition m is multiplied by the corresponding NRL value
. The resulting sequence is convolved with a normalized HRF h
γ
which is common to all conditions and voxels. Nuisance signals are finally added (drift Pℓ
j
and noise b
j
) to form the artificial BOLD signal y
j
.