The BM velocity distribution reconstructed from the derived wavenumber using the WKB approximation. The reconstructed response (dashed lines), obtained using the WKB approximation, shows good agreement with that from measurement (solid lines) (reproduced with permission from Journal of the Acoustical Society of America, 122, Shera, Laser Amplification with a Twist: Traveling-Wave Propagation and Gain Functions from throughout the Cochlea, 2738–2758, Copyright , Acoustic Society of America).
