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Behavioral tests of lesion

Behavioral tests of lesion. Used to differentiate cochlear/ retrocochlear site of lesion. Mostly replaced by OAE and electrophysiological tests. Examples of behavioral tests: ABLB (Alternate binaural loudness balance) SISI (Short increment sensitivity index) Tone decay test. ABLB.

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Behavioral tests of lesion

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  1. Behavioral tests of lesion • Used to differentiate cochlear/retrocochlear site of lesion. • Mostly replaced by OAE and electrophysiological tests. • Examples of behavioral tests: • ABLB (Alternate binaural loudness balance) • SISI (Short increment sensitivity index) • Tone decay test

  2. ABLB • Based on phenomenon of recruitment. • In normal hearing ears and hearing loss without recruitment, loudness grows in both ears in the same way. Equal loudness at equal sensation levels. • Recruitment: Abnormally rapid growth of loudness in the poorer ear. Seen in cochlear hearing loss. • Decruitment: Loudness grows very slowly in the poorer ear. Even very intense sounds may not be very loud. Seen in auditory nerve lesions.

  3. Growth of loudness

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