Two-tone distortion was measured in the intracochlear pressure in the base of the gerbil
cochlea, close to the sensory tissue, where the local motions and forces of the organ of Corti
can be detected. The measurements probe both the underlying nonlinear process that
generates two-tone distortion, and the filtering and spreading of the distortion products.
Some of our findings are as follows:(1) The observations were consistent with previous
observations of two-tone distortion in BM motion [J. Neurophysiol. 77, 2385–2399 (1997); J …