Hearing and Balance – Physics Inside Your Skull

Walk out of a loud concert and the world sounds muffled, with a faint ring that takes hours to fade — a small, temporary demonstration of just how much delicate mechanical engineering is packed into a space smaller than a coin. This episode follows sound on its journey from vibrating air to nerve signal, through the eardrum, the three smallest bones in the human body, and a fluid-filled spiral called the cochlea, before turning to the inner ear's other job: keeping you balanced. You'll come away understanding how the ear matches airborne sound to the fluid inside the cochlea, how the cochlea sorts sound into pitches, why hair cell damage from noise is usually permanent, how the vestibular system detects movement and tilt, and what's actually happening during vertigo, motion sickness and tinnitus. Talking Science is sponsored by Kinsoft. Visit www.kinsoft.com.au Further reading: National Institute on Deafness and Other Communication Disorders (NIDCD) – public guides on hearing and balance; Better Hearing Australia and Audiology Australia – hearing health resources; Nature Reviews Neuroscience – reviews on cochlear hair cell function; World Health Organization – guidance on safe listening and noise-induced hearing loss.