When sound waves enter the external auditory meatus, the tympanic membrane vibrates. That causes the ossicular system (malleus, incus, stapes) to vibrate. The vibration of the stapes causes the oval window, the part of the cochlea to which the stapes is connected, to vibrate.The oval window vibrations causes the fluid above the basilar membrane, the scala vestibuli, to be pushed deeper into the cochlea. This causes the basilar membrane which lies beneath the scala vestibuli to vibrate. Those vibrations cause the fluid in the cavity below the basilar membrane to be pushed outward towards the direction of the middle ear, utlimately causing a rhythmic bulging of the round window into the middle ear. It is the hair cells of the organ of Corti that transform the mechanical basilar membrane vibrations to nervous conduction.
...Then after all this it would take a few pages for me to tell you how the sound waves travel through those nerves to eventually get interpretated in the brain...
If they can't remember to put the seat down, you think they can manage all of this to actually listen?
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