Central Auditory Processing Disorder

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Central Auditory Processing Disorder ( CAPD) is a disorder that is often misunderstood because many of the behaviors and symptoms that characterize this disorder also can appear in other conditions like learning disabilities, attention deficit hyperactivity disorder (ADHD), and even depression.Auditory processing problems can occur independently or can coexist with others non-auditory disorders . A simple Questionnaire or checklist can help a speech-language pathologist , psychologist or even parents to screen the child , but only a certified audiologist can diagnose central auditory processing disorder . There is a battery of teat that need to be done to diagnose CAPD in school children which includes 1) Dichotic speech tests, 2) Monaural low-redundancy speech tests , and 3) Binaural (i.e., diotic) interaction tests .

First , Dichotic Speech Tests . Dichotic refers to different signals presented simultaneously to each ear . In these tests different speech stimuli is presented to both ears either simultaneously or in an overlapping manner (e.g., dichotic CVs, digits, words, sentences). Then the child is asked to repeat everything that is heard which tests for divided attention or repeat whatever is heard in one specified ear and this tests directed attention. The more similar and closely acoustically aligned the test items, the more difficult the task. Dichotic Digits test is one of the test that is most commonly used in this category . In this test four numbers are presented to the child simultaneously and the child is asked to repeat the numbers , for example number five is presented to the right ear and at the same time number three is presented to the left ear then number nine and two are presented simultaneously to ...

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...er ear,.Children with normal auditory processing will have no difficulty recognizing the speech . One example of test of tic category is the Rapidly Alternating Speech Perception test . In this test the sentence is divided into brief segments which are alternated rapidly between the two ears. For example the sentence ( open the door ) is divided into small segments between the two ears . The first segment OP will be presented it the first ear then EN will be presented in the second ear and so on . If the child hears only the segments presented to the right ear or left ear, he or she is unlikely to be able to recognize the sentence .

Forth ,temporal Processing Tests using tonal stimuli, require the listener to discriminate sound based on a sequence of auditory stimuli or temporal order in order to assess pattern perception and temporal functioning abilities.

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