Transcript Amplification systems: Hearing aids

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

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.
Growth of loudness