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When sound is applied to one ear the contralateral cochlea can also be stimulated to varying degrees, via vibrations through the bone of the skull. When the stimuli presented to the test ear stimulates the cochlea of the non-test ear, this is known as cross hearing. Whenever it is suspected that cross hearing has occurred it is best to use masking.
The tone decay test (also known as the threshold tone decay test or TTDT) is used in audiology to detect and measure auditory fatigue. It was developed by Raymond Carhart in 1957. In people with normal hearing, a tone whose intensity is only slightly above their absolute threshold of hearing can be heard continuously for 60 seconds.
Results of air conduction audiometry (in which the signals are presented to the ear through headphones, which create vibrations in the air) are reported using circles for the right ear and Xs for the left ear. Results of bone conduction audiometry (in which signals are presented using a vibrator which creates vibrations in the temporal bones of ...
"Ear infections can interfere with sound transmission, causing a ringing sensation in the ear," Lewis says. "Infections cause inflammation and fluid buildup, which disturb the auditory system ...
Tympanometry is an acoustic evaluation of the condition of the middle ear [1] eardrum (tympanic membrane) and the conduction bones by creating variations of air pressure in the ear canal. Tympanometry is an objective test of middle-ear function. It is not a hearing test, but rather a measure of energy transmission through the middle ear. It is ...
You may hear a squeak or popping sound as the air pressure equalizes. Fluid in the Ear . The most common cause of fluid in the ear is an infection, but it can also be caused by other medical ...
Through these, the perception of a physical stimulus (sound) and our psychological response to the sound is measured. [9] Several psychophysical methods can measure absolute threshold. These vary, but certain aspects are identical. Firstly, the test defines the stimulus and specifies the manner in which the subject should respond.
Caloric stimulation/reflex test uses temperature difference between hot and cold water or air delivered into the ear to test for neural damage. Caloric stimulation of the ear results in rapid side-to-side eye movements called nystagmus. Absence of nystagmus may indicate auditory nerve damage.