The ability of the auditory system to follow and to resolve changes in the amplitude and frequency of sound is of crucial importance for auditory perception and communication. This proposal focusses on amplitude changes and is a comprehensive psychophysical study of the ability to resolve and to extract information from changes in the amplitude of sound. The proposed projects are concerned with increasingly complex aspects of such dynamic processing. The objectives of these projects are: (1) to understand how amplitude changes are discriminated and coded, and how such discrimination relates to the detection of continuous amplitude changes produced by sinusoidal amplitude modulation; (2) to address fundamental questions of how auditory frequency analysis and spectral frequency region determine and affect temporal processing of amplitude changes; (3) to determine and describe how the ability to detect certain amplitude periodicities is affected by the presence of other periodicities; (4) to describe cross-channel temporal resolution, specifically, the ability to resolve differences in amplitude changes that occur in different frequency regions or channels; (5) to evaluate the hypothesis that auditory frequency selectivity 'sharpens' during stimulation and to pursue both experimentally and theoretically the implications of such dynamic filtering for dynamic processing. This project will provide information of fundamental importance for describing and understanding the dynamic properties of normal human hearing and, eventually, for understanding the consequences of hearing impairment on these properties. This project will provide normative data for evaluating the effects of hearing impairment on dynamic processes and, more generally, will provide a basis for the design of dynamic processing schemes in prosthetic devices such as hearing aids and cochlear implants.
| Byrne, Andrew J; Viemeister, Neal F; Stellmack, Mark A (2014) Discrimination of frequency variance for tonal sequences. J Acoust Soc Am 136:3172 |
| Byrne, Andrew J; Viemeister, Neal F; Stellmack, Mark A (2013) The effects of unmodulated carrier fringes on the detection of frequency modulation. J Acoust Soc Am 133:998-1003 |
| Byrne, Andrew J; Stellmack, Mark A; Viemeister, Neal F (2013) The salience of enhanced components within inharmonic complexes. J Acoust Soc Am 134:2631-4 |
| Viemeister, Neal F; Byrne, Andrew J; Stellmack, Mark A (2013) Spectral and level effects in auditory signal enhancement. Adv Exp Med Biol 787:167-74 |
| Stellmack, Mark A; Viemeister, Neal F; Byrne, Andrew J et al. (2013) The effects of marker-related temporal cues on auditory gap-duration discrimination. Atten Percept Psychophys 75:121-31 |
| Byrne, Andrew J; Wojtczak, Magdalena; Viemeister, Neal F (2012) Forward masking of frequency modulation. J Acoust Soc Am 132:3375-86 |
| Apoux, Frederic; Millman, Rebecca E; Viemeister, Neal F et al. (2011) On the mechanisms involved in the recovery of envelope information from temporal fine structure. J Acoust Soc Am 130:273-82 |
| Byrne, Andrew J; Viemeister, Neal F; Stellmack, Mark A (2011) Discrimination of temporally asymmetric modulation with triangular envelopes on a broadband-noise carrier (L). J Acoust Soc Am 129:593-6 |
| Wojtczak, Magdalena; Nelson, Paul C; Viemeister, Neal F et al. (2011) Forward masking in the amplitude-modulation domain for tone carriers: psychophysical results and physiological correlates. J Assoc Res Otolaryngol 12:361-73 |
| Byrne, Andrew J; Stellmack, Mark A; Viemeister, Neal F (2011) The enhancement effect: evidence for adaptation of inhibition using a binaural centering task. J Acoust Soc Am 129:2088-94 |
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