Figure 7.

Rate-ILD Functions of IC Neurons

(A and B) Rate-ILD functions for two neurons recorded in the left midbrain, for distributions with different means, and, as dotted lines, their hypothetical counterparts on the right side of the brain.

(C) Thresholds for zero mean versus nonzero mean ILD distributions.

(D) Black line shows the mean threshold for distributions with different means. Gray line indicates shifts in threshold equivalent in size to the 15 dB difference in the ILD distribution means. Rate-ILD functions with their baseline threshold <15 dB away from one end of the tested range were excluded from (C) and (D).

(E and F) Rate-ILD functions for two neurons for distributions with different variances, and, as dotted lines, their hypothetical counterparts in the right IC. The functions in (A) and (E) belong to the same unit.

(G) Mean slopes measured between ILDs of −20 dB and +20 dB for distributions with a high variance (SD = 20 dB) and those with a low variance (SD = 10 dB).

(H) Mean slopes as a function of variance. Error bars are ± SEM.