Figure 12.

Identification rates for mean data of HI and NH listeners in Experiment 5 are plotted in the left and right panels, respectively. Probability of responding /da/ as a function of F₂-onset frequency is plotted separately for each absolute spectral tilt. Circles, asterisks, squares, x’s, upward triangles, downward triangles, and +’s represent mean data for CVs with absolute tilts of −12, −9, −6, −3, 0, +3, and +6 dB/oct. respectively. Maximum-likelihood fits of identification rates are displayed for mean data at each vowel tilt as different lines (see legend).