Pathway recruitment curves for electrode configurations of monopolar (MP; contact 2 [-], case [+]), bipolar (BP; contact 2 [-], contact 3 [+]), and tripolar (TP; contact 1 [+], contact 2 [-], contact 3 [+]). The axonal pathway was the cerebellothalamic tract, stimulus pulse width was 90 μs, and fiber diameter was 5.7 μm.