Ossicular mass increases from otosclerosis cause high-frequency hearing loss

Evidence

As the disease progresses, however, the bony growths add mass to the ossicular chain. Because the increase in mass diminishes sound transmission at high frequencies, a high-frequency hearing loss (in addition to the already present low-frequency hearing loss) occurs. The presence of advanced disease will then elevate thresholds in the MAP/MAF functions on the high-frequency side. — Jennifer Lentz, Psychoacoustics- Perception of Normal…, 265

As the disease progresses, however, the bony growths add mass to the ossicular chain. Because the increase in mass diminishes sound transmission at high frequencies, a high-frequency hearing loss (in addition to the already present low-frequency hearing loss) occurs. The presence of advanced disease will then elevate thresholds in the MAP/MAF functions on the high-frequency side. The effects of later-stage otosclerosis are shown as the filled symbols on the MAP function of Figure 2–10, which demonstrates that the MAP thresholds at all frequencies are elevated. — Jennifer Lentz, Psychoacoustics- Perception of Normal…, 265

Categorization

• corroborated: 2 independent passages support this claim — Jennifer Lentz, Psychoacoustics- Perception of Normal…, 265
• XREF: connects to: Damage to outer auditory nerve fibers causes high-frequency hearing loss — David M. Howard, Jamie Angus, Acoustics and Psychoacoustics, 567