Abstract
Multi-channel electrodes are implanted in various regions in man for different medical purposes. Operating in a constant mode most of them surprise by simple stimulation strategies. For example single channel epidural stimulation of the spinal cord allows switching from tonic muscle output to a rhythmic stepping like pattern only by changing the stimulation frequency. However, speech understanding with cochlear implant needs sophisticated processing which can be done by a miniaturized computer behind the patient's ear. Even more complex stimulation patterns are desirable for electrode arrays of retina implants.
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