Temporal modulation discrimination function

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Abstract
Temporal Modulation Discrimination Functions (TMDF)—the discriminability of the rate of amplitude modulation—were obtained. Human observers were asked to perform a same—different discrimination between two frequencies (f,f + Δf) of sinusoidally amplitude-modulated wide-band noise. Since the long-term power spectrum of this kind of stimulus is not altered as a result of the amplitude modulation imposed, modulation frequency discrimination data are considered to be measures of the temporal resolving capacity of the auditory system. For each observer, the function relating Δf/f to f is relatively flat between 50 and 200 Hz, with clear individual differences in overall discrimination capacity (Δf/f ranging between 1% and 6%). The TMDF's are compared with the Temporal Modulation Transfer Function [N. F. Viewmeister, J. Acoust. Soc. Am. 53, 312(A), (1972)] and other functions relating temporally encoded information as well as to pure-tone frequency-difference limens. [Work supported in part by NSF.]

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