Comment on ‘‘Temporal modulation transfer functions in patients with cochlear implants’’ [J. Acoust. Soc. Am. 9 1, 2156–2164 (1992)]

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Abstract
Shannon [J. Acoust. Soc. Am. 91, 2156–2164 (1992)] reports a strong decrease of modulation detection thresholds with cochlear implant patients for an increase of the stimulus level. His conclusion that this result differs from the findings for acoustical stimulation in normal-hearing subjects needs some clarification. His statement about acoustic stimulation is based on modulation detection measurements for noise carriers, where, indeed, thresholds in normal-hearing subjects are nearly independent of level, at least for carrier levels of more than 20 dB SL. For sinusoidal carriers, however, the modulation detection thresholds decrease with increasing carrier levels over the entire hearing range, similar to his findings with implant listeners.

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