Distortion Product Otoacoustic Emissions (DPOAE) after exposure to noise and music of equal energy
Resumé
Exposure to intense noise and music can result in Temporary Threshold Shifts (TTS). Previous investigations suggest that music and noise may induce TTS differently and that the magnitude of TTS after noise exposure is larger compared to music exposure. Listening to music may induce unknown effects in the medial olivocochlear bundle which may suppress the size of the TTS. Ten normal hearing listeners were exposed for 10 minutes to 100 dB SPL familiar and unfamiliar music or noise on separate days. During the exposure of music or noise the test subjects focused entirely on the auditory stimulus. In a parallel experiment, the subjects had non-auditory attention on a puzzle task (the Tower of Hanoi). The order of the experiments was randomized. Pre- and post-exposure Distortion Product Otoacoustic Emissions (DPOAE) were measured at 2, 3 and 4 kHz. DPOAE response was suppressed on both ears immediately after noise exposure and on the left or the right ear after familiar and unfamiliar music exposure, respectively. Auditory attention compared to non-auditory attention resulted in higher DPOAE suppression on the left ear. In conclusion, music and noise with equal energy suppressed DPOAE responses on both ears but with noticeable differences between ears.
Referencer
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