In recent years there has been a growing body of psychoacoustical evidence demonstrating that stimulus components falling outside of the frequency region of a signal can have a significant effect on the processing of that signal. In profile analysis and in comodulation masking release (CMR) that effect is to decrease thresholds: the presence of flanking stimulus components tends to improve sensitivity. In other phenomena, such as across channel masking, the effect of flanking components is to elevate thresholds. The goal of the current project is to de'velop a model of across-channel processing that captures both facilitation and interference effects. This model is based on the premise that the most ecologically relevant characteristic of an auditory object is its spectral content as a function of time, and that stimulus conditions associated with synthetic listening (e.g., common onset across frequency) can be understood in terms of the spectral profile, regardless of whether this type of processing is optimal. Further, it is proposed that a psychoacoustical phenomenon demonstrating across-channel processing with amplitude modulated stimulus components, such as CMR, can be understood in terms of short-term spectral cues. Experiments will use standard psychoacoustical methods with human observers to test qualitative predictions of this approach, using paradigms associated with both facilitation and interference. Results will be analyzed using standard parametric statistical techniques, primarily repeated measures ANOVA. Data from these as well as published studies will be modeled in order to obtain quantitative predictions for a range of phenomena involving across- frequency masking and masking release.

National Institute of Health (NIH)
National Institute on Deafness and Other Communication Disorders (NIDCD)
Research Project (R01)
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Study Section
Auditory System Study Section (AUD)
Program Officer
Donahue, Amy
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University of North Carolina Chapel Hill
Schools of Medicine
Chapel Hill
United States
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Calandruccio, Lauren; Buss, Emily; Doherty, Karen A (2016) The effect of presentation level on spectral weights for sentences. J Acoust Soc Am 139:466-71
Buss, Emily; Calandruccio, Lauren; Hall 3rd, Joseph W (2015) Masked sentence recognition assessed at ascending target-to-masker ratios: modest effects of repeating stimuli. Ear Hear 36:e14-22
Calandruccio, Lauren; Buss, Emily; Hall 3rd, Joseph W (2014) Effects of linguistic experience on the ability to benefit from temporal and spectral masker modulation. J Acoust Soc Am 135:1335-43
Buss, Emily; He, Shuman; Grose, John H et al. (2013) The monaural temporal window based on masking period pattern data in school-aged children and adults. J Acoust Soc Am 133:1586-97
Buss, Emily; Hall 3rd, Joseph W; Grose, John H (2013) Monaural envelope correlation perception for bands narrower or wider than a critical band. J Acoust Soc Am 133:405-16
Buss, Emily; Hall 3rd, Joseph W; Grose, John H (2013) Factors affecting the processing of intensity in school-aged children. J Speech Lang Hear Res 56:71-80
Buss, Emily; Hall 3rd, Joseph W; Grose, John H (2012) Effects of masker envelope irregularities on tone detection in narrowband and broadband noise maskers. Hear Res 294:73-81
Buss, Emily; Grose, John H; Hall, Joseph W (2012) Frequency discrimination under conditions of comodulation masking release (L). J Acoust Soc Am 131:2557-60
Buss, Emily (2010) Spectral profile cues in comodulation masking release. J Acoust Soc Am 127:3614-28
Leibold, Lori J; Hitchens, Jack J; Buss, Emily et al. (2010) Excitation-based and informational masking of a tonal signal in a four-tone masker. J Acoust Soc Am 127:2441-50

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