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Contribution to Book
Effects of Monotic and Dichotic Interference Tones on the 40-Hz Auditory Steady-State Response
XX IERASG Biennial Symposium: Programme & Book of Abstracts (2007)
  • Shaum P. Bhagat, University of Memphis
Abstract
Auditory steady-state responses (ASSRs) elicited with multiple carrier tones modulated at high rates (> 70 Hz) have been incorporated as a diagnostic test to evaluate auditory function in infants and young children. The benefit of utilizing multiple carriers is that several test frequencies can be evaluated at one time, increasing test efficiency while minimizing the time required to acquire ASSRs. Another time-saving approach involves testing both ears simultaneously with dichotic presentation of carrier tones. Multiple ASSRs acquired in infants exhibit frequency specificity and can be recorded with dichotic stimulation. In adults, the largest ASSRs are evoked by tones modulated near 40 Hz. Since many adults cannot participate in behavioral auditory tests, the development of an efficient objective test with adequate frequency specificity in adults is warranted. This investigation examined the frequency specificity and dichotic characteristics of 40-Hz ASSRs recorded with multiple carriers. ASSRs were acquired with presentation of probe and interfering tones in 31 normal-hearing adults. The effects of interfering tone frequency, modulation depth and modulation rate on monotic and dichotic ASSR amplitudes were evaluated. Significant decreases in monotic ASSR amplitudes occurred when the interfering tone was higher in frequency and within an octave of the probe tone. Monotic ASSR amplitude reductions were also observed for interfering tones modulated at lower depths than the probe tone. Probe and interfering tones modulated at different rates produced similar effects on monotic and dichotic ASSRs. The description of the effects of stimulus parameters on multiple 40-Hz ASSRs can benefit clinical applications of this technique. This project was supported by a grant provided by The American Academy of Audiology Foundation. 
Publication Date
2007
ISBN
978-961-6456-29-6
Publisher Statement
Symposium held June 10-14, 2007 in Bled, Slovenia.
Citation Information
Shaum P. Bhagat. "Effects of Monotic and Dichotic Interference Tones on the 40-Hz Auditory Steady-State Response" XX IERASG Biennial Symposium: Programme & Book of Abstracts (2007) p. 102 - 102
Available at: http://works.bepress.com/shaum-bhagat/87/