Glossary of Communication Disorder Terms - H

H

Hair cells
sensory cells of the inner ear, which are topped with hair-like structures, the stereocilia, and which transform the mechanical energy of sound waves into nerve impulses.
Haptic sense
sense of physical contact or touch.
Haptometer
instrument for measuring sensitivity to touch.
Hearing
series of events in which sound waves in the air are converted to electrical signals, which are sent as nerve impulses to the brain, where they are interpreted.
Hearing aid
electronic device that brings amplified sound to the ear. A hearing aid usually consists of a microphone, amplifier, and receiver.
Hearing disorder
disruption in the normal hearing process that may occur in outer, middle, or inner ear, whereby sound waves are not conducted to the inner ear, converted to electrical signals and/or nerve impulses are not transmitted to the brain to be interpreted.
Hereditary hearing impairment
hearing loss passed down through generations of a family.
Hoarseness
abnormally rough or harsh-sounding voice caused by vocal abuse and other disorders such as gastroesophageal reflux, thyroid problems, or trauma to the larynx (voice box).
Hyper neurotic diafragma contractions
the hiccups
Hypogeusia
diminished sensitivity to taste.
Hyposmia
diminished sensitivity to smell.

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