How the Ears Turn Vibrations Into Sound

Sound waves enter the ear canal and shake the eardrum.
Three tiny bones—malleus, incus, stapes—amplify each vibration.
The cochlea’s fluid ripples stimulate hair cells tuned to pitch.
Those hair cells convert motion into electrical impulses.
Signals reach the brain’s auditory cortex for decoding.
High pitches activate the cochlea’s base; low tones reach the tip.
The ear’s precision lets you detect a whisper or thunder.
Loud noise can bend hair cells permanently—causing hearing loss.
Each ear sends slightly different timing to help locate sound.
What you “hear” is your brain’s best guess of the wave.