Table 1.

ROI-based 3-component fitting for white matter fibers in marmoset and human brains. Mean and standard deviation (between parentheses) across n experiments are reported for the relative amplitude A_i, relaxation rate ${\mathrm{R}}_{2,\mathrm{i}}^{\ast }$, and frequency shift Δf_i for each of the three components (i). In marmoset, orientation dependence was studied in the optic radiations (OR) showing increases in ${\mathrm{R}}_2^{\ast }$ and Δf for component 1, increases in ${\mathrm{R}}_2^{\ast }$ for component 2, and more negative Δf for component 3 when fibers are perpendicular to B₀. The component values for this orientation are confirmed by separate measurements in OR of marmoset (used for the MT experiment), and OR and splenium of the corpus callosum (SCC) in human.

	n	WM fiber	B0	A1 (%)	${\mathrm{R}}_{2,1}^{\ast }$ (Hz)	Δf1 (Hz)	A2 (%)	${\mathrm{R}}_{2,2}^{\ast }$ (Hz)	Δf2 (Hz)	A3 (%)	${\mathrm{R}}_{2,3}^{\ast }$ (Hz)	Δf3 (Hz)
Marmoset	1	OR	⊥	18.4	188.6	35.7	32.8	37.8	1.9	48.8	33.2	−6.9
	1	OR	||	21.3	134.8	−5.4	30.9	16.1	−2.5	47.9	34.7	1.1
	4	OR	⊥	20.2 (1.5)	186.4 (25.7)	25.7 (3.1)	32.7 (3.0)	32.1 (2.9)	2.5 (0.3)	47.1 (2.2)	30.6 (4.5)	−6.3 (0.5)
Human	4	OR	⊥	19.0 (1.5)	165.1 (10.7)	25.1 (1.8)	42.3 (1.6)	28.3 (2.9)	1.5 (0.3)	38.7 (1.0)	27 (2.0)	−6.0 (0.6)
	4	SCC	⊥	12.6 (1.1)	164.2 (20.1)	31.8 (2.3)	50.1 (2.4)	39.5 (1.5)	2.0 (0.2)	37.3 (2.2)	24.1 (2.9)	−4.1 (0.7)