Hearing or Sensing Sound
Hearing is the sense that detects sound — vibrations traveling through the air or another medium — and turns them into nerve signals the brain interprets.
Questions you may have include:
- What is sound?
- How does the ear hear it?
- How do we protect hearing?
What sound is
Sound is a wave of pressure — vibrations that travel outward from a source through a medium such as air. When these vibrations reach the ear, they can be heard.
How the ear hears
The outer ear collects sound and funnels it to the eardrum, which vibrates. Tiny bones in the middle ear amplify the vibration and pass it to the inner ear’s spiral-shaped cochlea. There, fluid moves tiny hair cells that convert the motion into nerve signals, which the brain interprets as sound.
Protecting your hearing
The hair cells in the inner ear can be damaged by very loud sound, and such damage is often permanent. Limiting exposure to loud noise and keeping volumes moderate helps protect hearing over a lifetime.
Summary
Hearing detects sound — pressure waves in the air — as the outer ear gathers it, the eardrum and middle-ear bones pass and amplify the vibrations, and the cochlea’s hair cells convert them to nerve signals the brain interprets. Protecting hearing means limiting loud-noise exposure.