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The cathodal and anodal strength-interval curves calculated using 20 ms S2 pulse duration for a small electrode in (a) and a large electrode in (b). The dashed line indicates the peak output of an electrical stimulator (8 mA). For the small electrode, both the anodal and cathodal curves lie below 8 mA, and for the large electrode, the cathodal curve lies below 8 mA but the break section of anodal curve lies above 8 mA [34].
