Distributions of STRF parameters of layer S2 units.

(a) Best temporal modulation frequency. (b) Response duration. (c) Center frequencies. (d) Spectral bandwidth. These four parameters respectively correspond to the peak and bandwidth with 90% power of the temporal and spectral profiles shown in Fig 3. (e) Tradeoff between temporal modulation (Best T) and spectral modulation. (f–i) Probability distribution of STRF parameters normalized from the corresponding histograms. For comparison, the normalized probability distributions in layers S1 and S3 and the reference distributions of inferior colliculus neurons in cats [30] are also plotted. The horizontal axis in each panel is normalized to [0, 1] by dividing all values by the maximum value.