Sensory-evoked potentials (EPs) are the electrophysiologic responses of the nervous system to sensory stimulation (Chiappa and Ropper, 1982a,b; Greenberg and Ducker, 1982). These responses, which reflect the condition of sensory pathways, can be used to identify abnormal or nonfunctional sensory pathways throughout the nervous system. EPs have been used for mapping the various structures that serve sensory functions of the nervous system in animals and humans (Kelly et al., 1965; Stohr and Goldring, 1969; Woolsey et al., 1979; Allison et al., 1986); for monitoring the functional integrity of specific sensory pathways and, to some extent, of adlacent pathways as well (Grundy, 1982,1983); and for measuring the neurologic responses to experimental and therapeutic interventions (Grundy et al., 1981a,b,c; Hacke, 1985; Mackey-Hargadine and Hall, 1985). This chapter will present a classification of EPs according to types of stimulation, modes of recording, methods of signal processing, types of poststimulus latencies, and purported neural generators. Current techniques will be described and experimental and clinical applications will be summarized.