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Electrical stimulators used to apply precisely timed and repeatable stimuli to the peripheral nerves. These stimulators are usually multiple-channel external stimulators, using external surface electrodes or invasive (i.e., needle) electrodes. Somatosensory electrical stimulators are used for evoked-potential procedures and also for other research procedures (e.g., functional mapping in epilepsy). Some of these stimulators are used as components of more complex devices, such as somatosensory evoked-potential recorders.
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