Stimulus electrode orientation influences eCAP due to differential activation of fascicles.

a: Recruitment curves for selected fascicles, electrode inserted along the major axis of the nerve (stimulus amplitude: 31.25 μ A) b: Fraction of myelinated fibers activated for each fascicle (electrode trajectory highlighted with black line for visualization purposes only; selected fascicles from panel a are marked with correspondingly colored asterisks). c-d: Same as a-b, for electrode insertion along the minor axis of the nerve. e: Simulated eCAPs.