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Auditory processing disorder (APD) is a neurodevelopmental disorder affecting the way the brain processes sounds. [2] Individuals with APD usually have normal structure and function of the ear, but cannot process the information they hear in the same way as others do, which leads to difficulties in recognizing and interpreting sounds, especially the sounds composing speech.
It is caused by the fact that even though one ear is unable to respond to the test, the other ear can still be stimulated by the bone conduction test (via conducting sound through skull bones to the opposite ear), causing the patient to respond to the tuning fork on mastoid but not when it's placed near the affected ear's air canal. [5]
Earwax helps protect the ear by trapping dust and other foreign particles that could filter through and damage the eardrum. [5] Normally, earwax moves toward the opening of the ear and falls out or is washed away, but sometimes excessive earwax can gather and become hard to remove. This is referred to as excessive earwax or impacted cerumen. [21]
[2] [10] Hearing loss is diagnosed when hearing testing finds that a person is unable to hear 25 decibels in at least one ear. [2] Testing for poor hearing is recommended for all newborns. [ 8 ] Hearing loss can be categorized as mild (25 to 40 dB ), moderate (41 to 55 dB), moderate-severe (56 to 70 dB), severe (71 to 90 dB), or profound ...
Auditory agnosia is a form of agnosia that manifests itself primarily in the inability to recognize or differentiate between sounds.It is not a defect of the ear or "hearing", but rather a neurological inability of the brain to process sound meaning.
If one ear has normal thresholds while the other has sensorineural hearing loss (SNHL), diplacusis may be present, as much as 15–20% (for example 200 Hz one ear => 240 Hz in the other). [citation needed] The pitch may be difficult to match because the SNHL ear hears the sound "fuzzy". Bilateral SNHL gives less diplacusis, but pitch ...
A sound to the side of the head is heard approximately 0.0005 seconds later by the ear furthest away. A sound halfway to one side is heard approximately 0.0003 seconds later. This is the interaural time difference (ITD) cue and is measured by signal processing in the two central auditory pathways that begin after the cochlea and pass through ...
Audiology (from Latin audīre 'to hear'; and from Greek branch of learning -λογία, -logia) is a branch of science that studies hearing, balance, and related disorders. [1] [2] Audiologists treat those with hearing loss and proactively prevent related damage. [3]