FIG. 7.

(a) Psychophysical f₀ DLs from Fig. 1(a) are replotted for direct comparison with the model predictions. (b) Model f₀ DL predictions based on d′ estimates shown in Fig. 6 using the lag window [Eq. (6)], plotted as a function of N. As in Fig. 1, f₀'s corresponding to values of N for the lowand high-spectrum conditions are plotted above each panel, and closed diamonds plotted along the top horizontal axis indicate that d′₀ was not reached at the maximum tested value of δ =0.3. Both experimental and model f₀ DLs generally overlap for stimuli with the same N, indicating the modified model successfully accounts for effects of N on f₀ discrimination performance.