Frequency-modulation (FM) technology as a method for improving speech perception in noise for individuals with multiple sclerosis

Michele Samantha Lewis, Michele Hutter, David J. Lilly, Dennis Bourdette, Julie Saunders, Stephen A. Fausti

Research output: Contribution to journalArticle

9 Scopus citations


Almost half of the population with multiple sclerosis (MS) complains of difficulty hearing, despite having essentially normal pure-tone thresholds. The purpose of the present investigation was to evaluate the effects of frequency-modulation (FM) technology utilization on speech perception in noise for adults with and without MS. Sentence material was presented at a constant level of 65 dBA Leq from a loudspeaker located at 0° azimuth. The microphone of the FM transmitter was placed 7.5 cm from this loudspeaker. Multitalker babble was presented from four loudspeakers positioned at 45°, 135°, 225°, and 315° azimuths. The starting presentation level for the babble was 55 dBA Leq. The level of the noise was increased systematically in 1 dB steps until the subject obtained 0% key words correct on the IEEE (Institute for Electrical and Electronic Engineers) sentences. Test results revealed significant differences between the unaided and aided conditions at several signal-to-noise ratios.

Original languageEnglish (US)
Pages (from-to)605-616
Number of pages12
JournalJournal of the American Academy of Audiology
Issue number8
Publication statusPublished - Sep 2006



  • FM technology
  • Hearing
  • Multiple sclerosis
  • Speech perception

ASJC Scopus subject areas

  • Otorhinolaryngology

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