Figure 2.

Time course of the effect on SOAEs of a single i.p. injection of sodium salicylate. This ear, whose initial total emission power was 700 μPa², exhibited both suppression and facilitation of SOAEs. Within 27 min of administration of a dose of 62 mg⋅kg⁻¹, emissions at frequencies above 1.0 kHz shifted downward in frequency and were transiently suppressed. Within 83 min, the emission originally at 1.0 kHz had largely recovered, whereas that at 2.3 kHz manifested a 123% increase over its initial value. Each trace is the average power spectrum obtained from 100 200-ms samples. In this illustration and in Figs. 4 and 5, “PSD” in the label of the ordinate axis refers to power-spectral density. In the same three figures, the interrupted horizontal lines provide fiducials against which to judge changes in emission power.