300,000 iPhone users join apple to unlock secrets of hearing loss
Knowledge-focused
Ongoing
This study uses iPhones and Apple Watches to measure headphone and environmental sound levels in 300,000 US adults over time. Participants answer surveys and take hearing tests through the Research app. The goal is to understand how sound exposure affects hearing health and to gu…
Sponsor: Apple Inc. • Aim: Knowledge-focused
Last updated May 11, 2026 20:53 UTC