Effect of cochlea damage on the detection of difference tone in signal envelope

• Autorzy: Kordus M.
• Języki publikacji: EN

Abstrakty

EN

Recent studies have demonstrated that the detection of complex temporal envelopes relies on the perception of a distortion component generated by cochlear and postcochlear (central) nonlinearity. In the present study, 4-kHz carrier was modulated by tones f1 and f2 to produce the difference tone f3=f2-f1 in the amplitude modulation domain. Detection thresholds for canceling tone f3 were obtained for subjects with normal-hearing and hearing-impaired subjects. In three experimental conditions, monaural and binaural presentation of tones was used to test possible central origin of the nonlinearity in modulation domain. Modulation depth at threshold was measured as a function of the phase of the canceling component f3 varied from 0° to 270° in 45° steps. Results showed that level of canceling tone f3 was phase dependent at all signal frequencies. Thresholds for normal-hearing and hearing-impaired subjects were lower for the in-phase condition than for the antiphase condition. Results demonstrated that cochlear damage had no large effect on the nonlinearity in the AM envelope indicating that the distortion component must be generated by a more central non linear effects.

Słowa kluczowe

EN

perception of amplitude modulation; difference tone; hearing impairment

• Wydawca: Instytut Podstawowych Problemów Techniki PAN ; Komitet Akustyki PAN ; Polskie Towarzystwo Akustyczne
• Czasopismo: Archives of Acoustics
• Rocznik: 2006
• Tom: Vol. 31, No. 4
• Strony: 551--554
• Opis fizyczny: Bibliogr. 4 poz.

Twórcy

autor

Kordus M.

• Adam Mickiewicz University, Institute of Acoustics, Umultowska 85, 60-614 Poznań, Poland,

Bibliografia

• [1] DERLETH R. P., et al., Modelling temporal and compressive properties of the normal and impaired auditory system, Hearing Research, 159, 132.149 (2001).
• [2] FULLGRABE C., LORENZI C., The role of envelope beats cues in the detection and discrimination of second-order amplitude modulation, J. Acoust. Soc. Am., 113, 49.52 (2003).
• [3] MOORE B. C. J., Perceptual consequence of cochlear damage, Oxford University Press, Oxford.
• [4] TANDETNIK S., GARNIER S., LORENZI C., Measurment of first and second-order modulation detection threshold in listeners with cochlear hearing loss, Br. J. Audiol., 35, 355.364 (2001).