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American Journal of Audiology Vol.12 84-90 December 2003. doi:10.1044/1059-0889(2003/015)
© American Speech-Language-Hearing Association
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Predicted Gain and Functional Gain With Transcranial Routing of Signal Completely-in-the-Canal Hearing Aids

Marc A. Fagelson 1, Colleen M. Noe 2, Owen D. Murnane 2, and Jennifer S. Blevins 2

1 East Tennessee State University, Johnson City
2 James H. Quillen VA Medical Center, Mountain Home, TN, and East Tennessee State University, Johnson City

fagelson{at}etsu.edu

Transcranial routing of signal (TCROS) was accomplished using completely-in-the-canal (CIC) hearing aids in 5 profoundly unilaterally hearing-impaired individuals. The functional gain realized by the participants far exceeded the gain predicted by measuring the acoustic output and real ear aided response of the hearing aids. The difference between predicted and functional gain increased with signal frequency and was attributed at least in part to mechanical vibration of the hearing aid in the external canal. Implications for fitting unilateral hearing loss using TCROS amplifying systems are discussed.

Key Words: Contralateral routing of signal, transcranial CROS, predicted gain, functional gain, mechanical transmission, interaural attenuation, crossover threshold

Submitted on August 12, 2003
Accepted on November 18, 2003


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