Journal: Trends in Hearing

Article Title: Time-Varying Distortions of Binaural Information by Bilateral Hearing Aids

doi: 10.1177/2331216516668303

Figure Lengend Snippet: Binaural distortions introduce spatial conflict and spread of ITD and ILD cues. (a) Each panel schematically depicts the KEMAR manikin in the test arena. ILD (outer arc) and ITD (inner arc) were mapped onto azimuth by interpolating measured control ITD and ILD values across azimuth. Note that because of the limited number of speakers used to measure the cues, the interpolation is coarse, and the projection does not capture expected nuances such as nonmonotonicity in the ILD across azimuth. The spatial location and extent of each colored arc depends on the weighted mean and standard deviation of the computed cues. Cues are depicted for the 4 kHz band of the 10-Hz SAM noise with the source at 0 azimuth. (b) As in (a), but for �imuth. Data extending into the rear hemifield are plotted to maintain a sense of measured variance but faded out to convey that the front-back ambiguity inherent in pure ITD and ILD values limits their interpretation. Note . ILD = interaural level difference; ITD = interaural time difference; SAM = sinusoidally amplitude-modulated.

Article Snippet: Stimuli consisted of broadband (white) noise bursts and 10-Hz sinusoidally amplitude-modulated (SAM) noise bursts designed in MATLAB (Mathworks, Natick, MA), and the consonant–vowel–consonant word, “purse” (/p 3 rs/), spoken by a female talker.

Techniques: Introduce, Control, Standard Deviation

Journal: Trends in Hearing

Article Title: Time-Varying Distortions of Binaural Information by Bilateral Hearing Aids

doi: 10.1177/2331216516668303

Figure Lengend Snippet: Frequency compression distorts envelope ITD. Each panel depicts the right- and left-ear signals for the 10-Hz SAM noise stimulus presented at +39°, within a given frequency band and recording condition (control and three HA programs). The calculated time-varying envelope ITD is given above each signal trace, with color intensity weighted according to the average binaural level of the corresponding signal bin (see text). Dashed black lines give the physiologic range of ITD. Note . ITD = interaural time difference; SAM = sinusoidally amplitude-modulated; HA = hearing aid.

Article Snippet: Stimuli consisted of broadband (white) noise bursts and 10-Hz sinusoidally amplitude-modulated (SAM) noise bursts designed in MATLAB (Mathworks, Natick, MA), and the consonant–vowel–consonant word, “purse” (/p 3 rs/), spoken by a female talker.

Techniques: Control

Journal: Trends in Hearing

Article Title: Time-Varying Distortions of Binaural Information by Bilateral Hearing Aids

doi: 10.1177/2331216516668303

Figure Lengend Snippet: Hearing aids cause time-varying fluctuations of ILD. Each panel gives right- and left-ear signals for the 10-Hz SAM noise stimulus presented at ±64. The signal trace is wrapped to the period of the modulation cycle, 100 ms. Time-varying ILD, computed according to Equation (4), is given above each signal trace, with the size of points and color intensity weighted according to the average binaural level of the corresponding signal bin (see text). The solid colored line gives the weighted mean ILD across all bins, while the colored dashed lines give the weighted standard deviation. Note . ILD = interaural level difference; SAM = sinusoidally amplitude-modulated.

Article Snippet: Stimuli consisted of broadband (white) noise bursts and 10-Hz sinusoidally amplitude-modulated (SAM) noise bursts designed in MATLAB (Mathworks, Natick, MA), and the consonant–vowel–consonant word, “purse” (/p 3 rs/), spoken by a female talker.

Techniques: Standard Deviation