PubMed Central, TABLE II: IEEE Trans Med Imaging. 2013 May; 32(5): 821–37. Published online 2012 October 19. doi: 10.1109/TMI.2012.2225636.

	Notation	Definition	Dimension
Variables	y _j ∈ ℝ ^N	Observed BOLD signal at voxel j	N
	b _j ∈ ℝ ^N	Acquisition noise vector at voxel j	N
	h _γ = {h_d _Δ _t , d = 0 … D} ∈ ℝ ^D ⁺¹	HRF sampled at Δ _t	D + 1
	a j m ∈ ℝ	NRL at voxel j for condition m	1
	a m = { a j m , j ∈ P γ } ∈ ℝ J γ n	NRLs for condition m	J_γ
	q j m ∈ { 0 , 1 }	Activation class for voxel j and condition m	1
	q m = { q j m , j ∈ P γ } ∈ { 0 , 1 } J γ	Activation classes for condition m	J_γ

Unknown Parameters	ℓ _j ∈ ℝ ^O	Low frequency drifts for voxel j	O
	Γ _j ∈ ℝ ^N ^× ^N	Noise precision matrix for voxel j	N × N
	μ m = {μ ₀ _m , μ ₁ _m } ∈ ℝ²	Mixture model means for NRLs in condition m	2
	v m = { v 0 m , v 1 m } ∈ ℝ + 2	Mixture model variances for NRLs in condition m	2
	β_m ∈ ℝ₊	Potts regularization parameter for condition m	1
	v _h ∈ ℝ₊	HRF prior parameter	1

Fixed	X _m ∈ {0, 1} ^N ^× ^D ⁺¹	Binary stimulus occurrence matrix for condition m	N × (D + 1)
Fixed	P ∈ ℝ ^N ^× ^O	Low frequency orthonormal function basis	N × O