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Module 24
UNIT 3 Hearing
| Term | Definition |
|---|---|
| Audition | the sense or act of hearing. |
| Frequency | the number of complete wavelengths that pass a point in a given time (for example, per second). |
| Pitch | a tone's experienced highness or lowness; depends on frequency. |
| Middle Ear | the chamber between the eardrum and cochlea containing three tiny bones (hammer, anvil, and stirrup) that concentrate the vibrations of the eardrum on the cochlea's oval window. |
| Cochlea | a coiled, bony, fluid-filled tube in the inner ear; sound waves traveling through the cochlear fluid trigger nerve impulses. |
| Inner Ear | the innermost part of the ear, containing the cochlea, semicircular canals, and vestibular sacs. |
| Sensorineural Hearing Loss | hearing loss caused by damage to the cochlea's receptor cells or to the auditory nerves; the most common form of hearing loss, also called nerve deafness. |
| Conduction Hearing Loss | a less common form of hearing loss, caused by damage to the mechanical system that conducts sound waves to the cochlea. |
| Cochlear Implant | a device for converting sounds into electrical signals and stimulating the auditory nerve through electrodes threaded into the cochlea. |
| Place Theory | in hearing, the theory that links the pitch we hear with the place where the cochlea's membrane is stimulated. |
| Frequency Theory | in hearing, the theory that the rate of nerve impulses traveling up the auditory nerve matches the frequency of a tone, thus enabling us to sense its pitch. (Also called temporal theory.) |
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