Sharpening of ITD and ILD tuning. This figure shows, for each neuron, the ITD and ILD tuning width and tuning ratio measured in PSPs and spike rates. a, The width of the main peak of ITD (filled circles) and ILD (open circles) tuning curves is narrower in spike rates than in PSPs. b, For both ITD (filled circles) and ILD (open circles), the tuning ratio in spike rates is significantly larger (i.e., narrower tuning) than in PSPs. The dashed line in eachpanel would result if the tuning width or ratio were the same for spike rates and PSPs.