Figure 3.
Distortion product otoacoustic emission traces, averaged across participants, from Experiment 2 (top panel). The mean DPOAE trace recorded in the auditory-ignoring (movie/subtitle viewing) condition is shown in green, and the mean DPOAE trace recorded in the auditory-attending (tone-counting) condition is shown in red. Each trace is fitted with a two-component exponential. The two DPOAE traces normalized to onset level are shown in the lower panel (and inset). Consistent with the findings of Experiment 1, the DPOAE adaptation curve recorded during the auditory-ignoring condition is significantly higher (p < 0.001) in overall level compared with that recorded during the auditory-attending condition (red). The calculated time constants are 114 ms for the auditory-ignoring condition and 127 ms for the auditory-attending condition. The absolute difference between the two traces is ∼1 dB.