Table 1.

Gradients settings used in the visual and tactile fDTI experiments.

	Scan block #1	Scan block #2	Scan block #3	Scan block #4	Scan block #5	Scan block #6
Gradient #1	G(1, 0, 0)	G(0, 1/2√2, 1/2√2)	G(1/2√2, 0, 1/2√2)	G(1/2√2, 1/2√2, 0)	G(0, 0, 1)	G(0, 1, 0)
Gradient #2	G(0, 1, 0)	G(1, 0, 0)	G(0, 1/2√2, 1/2√2)	G(1/2√2, 0, 1/2√2)	G(1/2√2, 1/2√2, 0)	G(0, 0, 1)
Gradient #3	G(0, 0, 1)	G(0, 1, 0)	G(1, 0, 0)	G(0, 1/2√2, 1/2√2)	G(1/2√2, 0, 1/2√2)	G(1/2√2, 1/2√2, 0)
Gradient #4	G(1/2√2, 1/2√2, 0)	G(0, 0, 1)	G(0, 1, 0)	G(1, 0, 0)	G(0, 1/2√2, 1/2√2)	G(1/2√2, 0, 1/2√2)
Gradient #5	G(1/2√2, 0, 1/2√2)	G(1/2√2, 1/2√2, 0)	G(0, 0, 1)	G(0, 1, 0)	G(1, 0, 0)	G(0, 1/2√2, 1/2√2)
Gradient #6	G(0, 1/2√2, 1/2√2)	G(1/2√2, 0, 1/2√2)	G(1/2√2, 1/2√2, 0)	G(0, 0, 1)	G(0, 1, 0)	G(1, 0, 0)

G(x, y, z) is the gradient direction vector where x points in the subjects right–left direction, y points in anterior–posterior direction and z points in the inferior–superior direction. For each subsequent scan block the set of six gradients is rotationally shifted by one.