Application of evoked steady-state responses as auditory test on subjects with different auditory degrees
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Keywords
Auditory steady-state responses, frequency of modulation, electrophysiological ASSR thresholds, estimated audiometrical thresholds
Abstract
Introduction: Auditory steady-state responses (ASSR) correspond to brain responses evoked by continuous auditory stimuli, modulated in amplitud and/or frequency (AM/FM). This test can objectively determined specific frequency thresholds. Aim: To understand the procedures and to describe the results of the ASSR test application on subjects with different auditory degrees. Material and method: Exploratory and transversal study in 10-to-30-years subjects with normal hearingor hearing loss (55 ears). The stimuli were pure tones (0.5, 1, 2 y 4 kHz) at 46-Hz AM/FM. Results: A high correlation coefficient was obtained between audiometry and the ASSR as well in the average (r =0.980) as in each evaluated frequency. The ASSR thresholds presented higher values than the audiometrical thresholds. The average difference were 23 dB HL in normally hearing subjects and 13 dB HL in hearing- impaired subjects. Conclusion: The ASSR threshold in the hearing-impaired group were closer to the audiometrical thresholds than in the normally hearing group. Due to the high correlation between audiometry and ASSR, it can be considered its incorporation in the clinical evaluation, bestowing a complementary value in the detection of auditory pathologies.
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