Two stages of bandwidth scaling drives efficient neural coding of natural sounds
Fig 4
Spectra of vocalizations (VC) and background (BG) natural sound ensembles. Power spectra are shown for both the (A) cochlear and (B) Fourier-based model representations. Dotted lines represent the best linear fit between 0.1–10 kHz. All but one of the natural sounds have a Fourier spectrum with negative slope, while cochlear spectrums, by comparison, have more varied slopes (positive and negative) indicating a more even distribution of power across frequencies. The spectral entropy of each sound category is listed on the right side of the panel.