Loud Music Exposure and Cochlear Synaptopathy in Young Adults: Isolated Auditory Brainstem Response Effects but No Perceptual Consequences.

This was an observational comparison of people grouped by reported loud-music history, not a randomised trial, so it cannot prove that loud music caused the brainstem difference. The exposed and control groups were defined by self-reported concert attendance, not by measured cochlear synaptopathy, and controls also reported some loud-music exposure. The exposed group included many musicians, and musical experience may have improved auditory performance and masked possible deficits. Several tests had missing data because scheduling or technical problems, so not all participants contributed to every result. The positive finding relied on a derived Wave I to Wave V ratio, while the individual Wave I and Wave V amplitudes did not differ. The study tested young adults with normal hearing, so it does not describe people with hearing loss.

Do not read the Wave I/Wave V ratio difference as proof that loud music causes perceptual hearing loss. The exposed group had normal audiograms and no group differences on speech, temporal, spectral, or other behavioral tests.