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Sensitivity and specificity of auditory steady-state response testing.

Camila Maia Rabelo¹, Eliane Schochat

¹Department of Physical Therapy, Speech Therapy and Occupational Therapy, Universidade de São Paulo, São Paulo, Brazil. cmrabelo@yahoo.com.br

Clinics (Sao Paulo, Brazil)

|March 26, 2011

Summary

Auditory steady-state response (ASSR) testing shows lower sensitivity but high specificity for detecting central auditory nervous system disorders. The ASSR-estimated thresholds were significantly worse in patients with mesial temporal sclerosis compared to normal hearing individuals.

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Area of Science:

Neuroscience
Audiology
Electrophysiology

Background:

Auditory steady-state response (ASSR) testing is an electrophysiological method used to assess neural synchrony.
It evaluates the brain's response to modulated auditory stimuli, such as tones.

Purpose of the Study:

To determine the sensitivity and specificity of ASSR testing.
To assess its efficacy in detecting lesions and dysfunctions within the central auditory nervous system (CANS).

Main Methods:

Seventy volunteers were categorized into three groups: normal hearing, mesial temporal sclerosis, and central auditory processing disorder.
ASSR testing was performed on both ears at 500 Hz and 2000 Hz using frequency modulation.
The difference between ASSR-estimated thresholds and behavioral thresholds (audiometric evaluation) was calculated.

Main Results:

ASSR-estimated thresholds were significantly higher in the mesial temporal sclerosis group compared to normal and central auditory processing disorder groups.
The discrepancy between ASSR-estimated and behavioral thresholds was most pronounced in the mesial temporal sclerosis group.
Overall sensitivity of ASSR testing was lower than its specificity, with both being reduced in the central auditory processing disorder group.

Conclusions:

Individuals with CANS lesions exhibit a larger difference between ASSR-estimated and behavioral thresholds, indicating worse ASSR thresholds.
This difference may stem from impaired neural transmission, asynchronous transmitter release, or reduced temporal resolution.
ASSR testing demonstrates high overall specificity but lower sensitivity for CANS disorders, particularly in cases of central auditory processing disorder.