Abstract
Detection of amplitude and pulse‐width modulation was measured in patients with the Symbion and Nucleus cochlear implants as a function of modulation frequency. The resulting temporal modulation transfer functions (TMTFs) are similar to those of normally hearing listeners [N. F. Viemeister, J. Acoust. Soc. Am. 66, 1364–1380 (1979)]. Modulation detection functions are basically low pass, with best sensitivity to modulation frequencies of 20–100 Hz and decreasing sensitivity for modulation frequencies above 100 Hz. Modulation detection performance is similar whether the carrier is an analog sinusoidal stimulus or a biphasic pulse train. These results suggest that envelope detection mechanisms are intact in these implanted patients, even though their cochleae are not functioning and the pattern of activation in their auditory nerves are quite different from any normal acoustic pattern of activity. [Work supported by NIH NS24754.]
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