Mark A. Ericson
Lawrence L. Feth
Dept. of Speech and Hear. Sci., Ohio State Univ., Columbus, OH 43210
Ashok K. Krishnamurthy
Ohio State Univ., Columbus, OH 43210
A profile analysis task was chosen to test the predictions of a
multichannel IWAIF model. A 2Q, 2AFC three up-one down, adaptive staircase
procedure was incorporated with a 20-dB roving signal level to determine the
detection threshold of a 1-kHz target tone in each profile. The masker profiles
included 11 adjacent of the 21 possible components ranging from 200 to 5012 Hz.
The components of the profile were spaced logarithmically at frequency ratios
of 1:1.18 so that no two components fell into any one critical band. The fixed
frequency target tone was placed at either the second lowest, middle, or second
highest component in each 11 component profile. The IWAIF model predictions are
compared with channel theory predictions [Durlach et al.,