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Auditory steady state responses elicited by silent gaps embedded within a broadband noise
Seiichi Kadowaki1, Takashi Morimoto2, Hidehiko Okamoto3
1Department of Physiology, International University of Health and Welfare Faculty of Medicine Graduate School of Medicine, 4-3 Kozunomori, Narita, 286-8686, Japan.
Background:
Auditory temporal processing plays an important role in speech comprehension. Usually, behavioral tests that require subjects to detect silent gaps embedded within a continuous sound are used to assess the ability of auditory temporal processing in humans. To evaluate auditory temporal processing objectively, the present study aimed to measure the auditory steady state responses (ASSRs) elicited by silent gaps of different lengths embedded within a broadband noise. We presented a broadband noise with 40-Hz silent gaps of 3.125, 6.25, and 12.5 ms.
Results:
The 40-Hz silent gaps of 3.125, 6.25, and 12.5 ms elicited clear ASSRs. Longer silent gaps elicited larger ASSR amplitudes and ASSR phases significantly differed between conditions.
Conclusion:
The 40 Hz gap-evoked ASSR contributes to our understanding of the neural mechanisms underlying auditory temporal processing and may lead to the development of objective measures of auditory temporal acuity in humans.
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