Abstract
The effects of duration and of frequency on frequency discrimination are consistent with a neural-based model that used the temporal information present in the phase-locked response of VIIIth nerve units to estimate the frequency of a pure-tone stimulus [J. L. Goldstein and P. Srulovicz, “Auditory-nerve spike intervals as an adequate basis for aural frequency measurement” in Psychophysics and Physiology of Hearing, edited by E. F. Evans and J. P. Wilson (Academic, London, 1977), pp. 337–346]. We have extended this model to include the effects of intensity on the frequency difference limen by incorporating (1) the functional dependence of the synchronization index on intensity [D. H. Johnson, doctoral dissertation, MIT, 1974] and (2) an appropriate dependence of average discharge rate on intensity. When fit to the psychophysical data, the extended model accounts for much of the effect of intensity on the frequency DL above 10 dB SL. At levels lower than this, the model does not exhibit the same rapid increase in the DL observed in the human data. We will discuss this discrepancy as well as our attempts to generalize the model to account for the effects of hearing impairment on frequency discrimination. [Work supported by NINCDS Grant NS12125.]
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