Abstract
Psychophysical studies were conducted on eight prelingually deaf cochlear implant patients, between 5 and 23 years of age at the time of surgery, who were deafened prior to 4 years of age. Electrical stimulation of the auditory nerve was by means of the Nucleus multiple‐electrode prosthesis. The average difference limens for the prelingual patients in electric current level (7% of the dynamic range between threshold and comfort level), duration (17 ms for a standard of 30 ms), and the detection of a gap in a 1‐s signal (9 ms) were in the same range as those reported for postlingually deafened adult implant patients. The average difference limens in repetition rate for the prelingual patients (19% for a standard of 100 rep/s and 28% for a standard of 200 rep/s) were poorer than those found for the postlingual patients (5% for 100 rep/s and 8% for 200 rep/s). Individual differences in performance were observed for the prelingual patients in all studies.
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