FIG. 9.

Potential explanation for the altered traveling wave within the BETA2/NeuroD1 null cochlea. a In the wild-type (+/+) mouse, the fluid impedance of the cochlear duct is summed along the length of the cochlear duct to the area of the cochlear partition tuned to the stimulus frequency. b In this rendition of the null (−/−) mouse cochlea, the modiolus is drawn as being severely deficient such that the fluid impedance is not summed in series, and instead the sound pressure wave is shunted across cochlear turns.