1. A method, comprising: a) delivering an electrical signal to a cranial nerve of a patient according to at least a first parameter and a second parameter; b) measuring an electrical response of said nerve to said electrical signal; c) adjusting said first parameter while said second parameter remains constant; and d) repeating a) through c) to acquire a plurality of electrical responses; and e) determining a lower threshold setting and an upper threshold setting from the plurality of electrical responses.