5pPP1. The masking-level difference in low-noise noise.

Session: Friday Afternoon, May 17


Author: Joseph W. Hall III
Author: John H. Grose
Location: Div. Otolaryngol., Univ. North Carolina at Chapel Hill, Chapel Hill, NC 27599-7070
Author: William M. Hartmann
Location: Michigan State Univ., East Lansing, MI 48824

Abstract:

The masking-level difference for a 500-Hz pure tone signal was examined for an interaurally in-phase noise having different degrees of power fluctuations. MLDs were reliably smaller in noise having relatively low power fluctuations. This effect was due to the following trends in the threshold data. (1) For all subjects, the So threshold improved as the degree of noise fluctuation decreased. (2) For some subjects, the S(pi) threshold worsened as the degree of noise fluctuation decreased. (3) For some subjects, the S(pi) threshold stayed constant as the degree of noise fluctuation decreased. These results are discussed in terms of comodulation masking release and the relevance of envelope cues for the MLD. [Work supported by AFOSR.]


from ASA 131st Meeting, Indianapolis, May 1996