Two stages of bandwidth scaling drives efficient neural coding of natural sounds
Fig 9
Modulation bandwidth scaling in the midbrain model accounts for the modulation whitening.
Averaging over all sounds, the (A) cochlear model MPS overemphasizes low temporal and spectral modulations whereas the (B) midbrain model is substantially flatter MPS. (C) Residual gain of the midbrain modulation filters arising from bandwidth scaling. (D) The predicted midbrain MPS obtained by adding the Cochlear MPS (A) and bandwidth-dependent gain (C) accounts for the whitened output of the midbrain model.