Fig. 4.
Effect of 9-AC on electrically evoked displacement at 0.8 kHz in the third turn of the cochlea. 9-AC was applied at the time indicated by the arrow marked 1; wash out began at the arrow marked 2. RL: black circles (second-row OHC) and triangles (IHC). TM: colored circles (second-row OHC) and triangles (IHC). BM: black squares. BM recording location was at the intersection with the BM of a normal vector from the RL of the IHC. Because such pharmacological experiments required longer time than normal, the uppermost data points (open black circles) represent control data from a cochlea (at the RL of a second-row OHC), which was not perfused with 9-AC. This compound reduced the amplitude within 7 min (including ≈5-min perfusion time); there was no effect on the phase response (data not illustrated). Amplitudes returned asymptotically to the values expected for an experiment of this long duration.