Fig. 4.

Population responses to spectral contrast. (A and B) Rate-contrast curves for 54 high- (blue) and 36 low- (green) contrast neurons. (C) Mean rate-contrast curves for high- and low-contrast neurons. Error bars show standard error of the mean (SEM). (D) Percentage of neurons whose rate-contrast peaks occurred at the given contrast values. (E) Mean ± SEM rate-level curves showing lower thresholds and higher rates for high- than for low-contrast neurons but similar shapes. (F) Percentage of neurons whose rate-level peaks occurred at the given sound levels. Magnitude of contrast preference (max absolute rate-contrast slope with sign preserved) are shown as a function of (G) CF and (H) orthogonal distance lateral to the lateral sulcus and (I) as a histogram.