Spontaneous emission post-exposure oscillations follow an underdamped sinusoid with periods around 250 seconds

Evidence

SOAE leveland frequency oscillations were fitted with an (inverted-phase) underdamped sinusoidal oscillation. The period of the fitted sinusoid was 257 s (202 s, 294 s) for the level time course and 252 s (215 s, 367 s) for the frequency time course. The time constant of the damped sinusoid for level changes was 120 s (76 s, 157 s) and for frequency changes 94 s (58 s, 141 s). — Dijk, Pim van, Physiology, Psychoacoustics and…, 3703