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SCAN-A (Test for Auditory
Processing
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SCAN-A is a test for Auditory Processing Disorders in Adolescents and Adults and will take approximately 20 minutes to complete. This test can identify a central auditory processing disorder and obtain information about an individual’s ability to process auditory stimuli.
SCAN-A includes four subtests: Filtered Words, Auditory Figure-Ground, Competing Words, and Competing Sentences.
Filtered Words Subtest: In this subtest, the subject is asked to repeat words that sound muffled. The test stimuli consist of one syllable words that have been low-pass filtered at 500 Hz. Two practice words and 20 test words are presented to each ear.
Auditory Figure-Ground Subtest: The Auditory Figure-Ground subtest evaluates the subject's ability to understand words in the presence of background noise. One syllable words were recorded in the presence of multi-talker speech babble noise at the 0 dB signal-to-noise (S/N) ratio. Two practice words and 20 test words are presented to each ear.
Competing Words Subtest: In the Competing Words subtest, the subject hears two words simultaneously--one word presented to each ear. The test stimuli consist of one syllable word pairs presented to the right and left ears. First, 2 practice word pairs and 15 word pairs are presented. The subject is instructed to repeat the words presented in each ear, repeating the word heard in the right ear first. Then, a second set of 2 practice word pairs and 15 word pairs are presented, with the subject repeating the word heard in the left ear first.
Competing Sentences Subtest: In this subtest, pairs of sentences unrelated in topic are presented to the right and left ears. The sentence pairs presented have simultaneous onset and offset times. This subtest consists of a directed listening task, in which the subject is instructed to direct attention to the stimuli presented in one ear, while ignoring stimuli presented to the other ear. First, 2 practice sentence pairs and 10 test sentence pairs are presented. The subject is instructed to repeat only the sentence heard in the right ear. Then, another set of practice and test sentence pairs is presented. This time, the subject is instructed to repeat only the sentence heard in the left ear.
The Filtered Words and Auditory Figure-Ground subtests tap auditory perception of distorted speech or speech that is compromised by a poor acoustic environment. These subtests represent functional auditory abilities in everyday listening situations, (i.e., when speech is heard in the presence of background noise, or when speech is distorted by poor articulation, a fast speaking rate, an accent, or dialect). The Competing Words and Competing Sentences subtests are dichotic speech tasks that reflect the development of the auditory system, auditory maturation, and hemispheric specialization.
These four subtests provide measures of specific aspects of speech recognition commonly associated with auditory processing. The test can be administered using equipment readily available to qualified professionals involved in identifying individuals at risk for auditory processing disorders.
SCAN-A was normed on 125 subjects between the ages of 12 and 50 years. Subjects were obtained from 21 sites located in the four major regions of the country. Subjects were grouped according to age and gender. The data obtained from this study confirmed the original hypothesis that the auditory system of normally developing individuals is typically mature by age 12 years and that results of central auditory tests are the same for individuals aged 12 through 50.
To purchase this product in the USA phone 1-800-872-1726
Australia and New Zealand for Scan-C and Scan-A and the ACPT check the following websites: http://www.harcourt-au.com or www.psychcorp.com.au or contact the client services team at 1800 882 385 toll free within Australia and 0800 942 722 free call from New Zealand.
For further information on Scan-A click here.
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