Figure 9.

Distributions of d′ as a function of unit CF. A, B, Represent base rates of 5 and 10 bps, respectively. Each d′ in the distributions represents for one unit the greatest magnitude for discrimination of A and B sources across B locations 20° to the left or right of A sources at C 40°, 0°, and I 40° (i.e., the maximum across 6 A/B locations, all with 20° between A and B). Data are binned in 1 oct bins of CF-centered 1 oct intervals. The rows of numbers above the abscissae indicate the number of d′ values in each bin. Asterisks indicate bins in which the medians were significantly higher than the medians in the 0.5 kHz bins (p < 0.05, corrected for multiple comparisons).