Fig. 1.
Three different ways of estimating cochlear tuning used in ferrets. ANFs, threshold levels (gray line) for a response are fit with a filter model (red line), from which the ERB (dashed gray line) is calculated. OAEs, the mean phase gradient of OAEs (red line) is used to estimate filter sharpness, QERB (=f/ERB), using the approximate species invariance of the tuning ratio. PSY, the behavioral detection of a pure tone in the presence of two bands of noise, separated by varying spectral distances. ERB (blue dashed line) is estimated by fitting a filter model to the detection thresholds. ANF data from ref. 27.