Fig. 5.

Examples of an A1 neuron whose firing rate was not modulated by TNR and one whose firing rate was suppressed by TNR. Raster plots and peristimulus time histograms represent an A1 neuron whose firing rate was not differentially modulated by the different values of TNR of the target-in-noise stimulus and by the noise-only stimulus (A) and one whose firing rate was suppressed by TNR (C). Data in B and D show each neuron’s corresponding neurometric function. The data are formatted in the same manner as Fig. 4.