A 2-FILTER MODEL FOR FREQUENCY DISCRIMINATION

In this paper, we explore a two-filter model, the simplest version of multi-channel models for frequency discrimination of simple tones. Acc ording to this model, frequency discrimination is based on a change in the relative output levels of two auditory filters, one centered belo w and the other above the frequency of the tone. This idea can explain the experimental results that frequency discrimination is relatively unaffected by randomization of stimulus level. Moreover, it suggests a close relationship between the ability of listeners to perform freque ncy discrimination of simple tones and spectral-shape discrimination o f two-tone complexes. The ability of three listeners to perform these two tasks was measured at six frequencies (from 0.25 to 8 kHz). The re sults from the spectral-shape-discrimination task were used to predict frequency-difference limens. There was a high correlation between obt ained and predicted values.