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American Journal of Audiology Vol.8 128-136 December 1999. doi:10.1044/1059-0889(1999/015)
© American Speech-Language-Hearing Association
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Effect of Speech Processor Program Modifications on Cochlear Implant Recipients' Threshold and Maximum Acceptable Loudness Levels

John C. Sun 1, Margarate W. Skinner 1, S. Y. Liu 2, and T. S. Huang 2

1 Washington University School of Medicine, St. Louis, Missouri
2 Chang Gung Memorial Hospital, Taipei, Taiwan, R.O.C.

sunj{at}medicine.wustl.edu

This study's purpose was to determine whether or not modifications in speech processor electrical stimulation levels were associated with changes in five Nucleus 22 cochlear implant recipients' thresholds or maximum acceptable loudness levels (MALs). These modifications in minimum and maximum stimulation levels were made to optimize hearing in everyday life. One threshold and one MAL were obtained on each active electrode during six, weekly test sessions, three before and three after program modification. Only one participant had a significant change in threshold after program modification; this participant and four others had significant changes in MAL. Participants' threshold variability was the same, but MAL variability was higher than that observed in other studies. Because these participants had no experience making MAL judgments prior to this study, this result suggests that implant recipients should be given sufficient practice in making MAL judgments to provide a stable clinical estimate of the upper boundary of the electrical dynamic range.

Key Words: cochlear implant, threshold, maximum acceptable loudness level, speech processor program, hearing change

Submitted on March 1, 1999
Accepted on June 9, 1999






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