Most shell IC neurons are broadly responsive to sAM depth. A, Example ΔF/F traces (left) and sAM depth tuning curve (right) for a broadly tuned representative example cell. B, The same as in A for a cell tuned to high sAM depths. C, The same as in A for a cell tuned to low sAM depths. D, The same as in A for a cell tuned to intermediate sAM depths. E, Mean ± standard deviation of ΔF/F peak for all sound-excited cells (272) shows no linear correlation with sAM depth. The histogram bars indicate the relative proportion of significantly responsive neurons at each sAM depth as determined by trial-to-trial correlation bootstrapping analysis. F, Lifetime sparseness for sAM depth responses of all neurons with significant activity during sound presentation.