Spread of excitation via tectorial membrane (TM) traveling waves in wild-type mice, mutant mouse models, and humans. (A) Snapshots of TMs mounted in the wave chamber with an exponentially decaying wave pasted on the image for wild-type, Tectb−/−, TectaY1870C/+, and human TMs. The decaying wave highlights the spatial extent of TM waves at a given frequency. (B) Pooled datasets showing TM wave speed (top) and wave decay constants (bottom) measured across wild-type, TectaY1870C/+, and Tectb−/− TMs. (C) Pooled datasets for TM wave speed (top) and wave decay constants (bottom) for human TMs compared with mouse TMs (tested 48 h postmortem [PM]). (Panels adapted from data in Sellon et al. 2014 and Farrahi et al. 2016.)