Modulation of auditory steady-state responses related to auditory function



Keita Tanaka, Ph.D.

Division of Electronic and Mechanical Engineering

Department of Science and Engineering,

Tokyo Denki University, Japan


Auditory steady-state responses (ASSRs) to sinusoidal amplitude-modulated (SAM) tones or to repeated clicks presented at rates between 10 and 70 Hz have been recorded since the 1980s. The basic method of ASSR elicitation and measurement will be presented. The amplitude and phase of ASSRs changed as a function of varied stimulation parameters. The ASSR amplitude did not vary with tone frequencies when the level of sound pressure was adjusted along an equal-loudness curve. Further, the amplitude was not dependent on the existence of a preceding tone, or the varying frequency of a preceding tone. When the levels of SAM tones were changed with frequencies in the range of 440–990 Hz, the amplitude of ASSR varied in a manner that was proportional to the level of sound. The phase of ASSRs exhibits stochastic resonance shown in phase synchrony when responding to modulated sinusoidal sound superimposed with weak white noise. These characteristics favor the use of ASSR in studying temporal processing of auditory information in the auditory cortex. Thus, ASSRs are a useful tool for both basic auditory studies and clinical use such as audiometry.



Keita Tanaka received the B.E. and M.E. degrees in Electrical and Electronic Engineering from the Kagoshima University, Japan, in 1998 and 2000, respectively, and Ph.D degree from the Kagoshima University, Japan, in 2003. He was with Tokyo Denki University as Research Associate in the Research Center for Advanced Technologies from 2003 to 2008. He is currently Associate Professor of the School of Science and Engineering, Tokyo Denki University

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