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Title: Binaural processing in a multi-sound environment : the role of auditory grouping cues.
Author: Hill, Nicholas Ian.
ISNI:       0000 0001 3578 4229
Awarding Body: University of Sussex
Current Institution: University of Sussex
Date of Award: 1994
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An important question in auditory research concerns the extent to which the perceptual attributes of a sound source are invariant of the background against which that sound is presented. The experiments reported herein examined the conditions under which the perceived lateral position of a sound was influenced by the presence of other sounds, in particular, the role of auditory grouping cues in segregating binaural information was investigated. Two distinct sets of experiments were conducted. In the first, a lateralisation-matching procedure was used which exploited the paradigm of Trahiotis and Stern [C. Trahiotis and R. M. Stern, J. Acoust. Soc. Am. 86, 1285-1293 (1989)] to investigate the influence of a spectrally flanking complex on the lateral position of a perturbed harmonic. Three types of perturbation were considered: onset asynchrony (Experiments 1 & 2), mistuning (Experiment 3) and frequency modulation (Experiment 4). It was found that even for relatively small perturbations the tone was perceived to be in a different lateral position to the complex, with the influence of the flanking components decreasing monotonically with increases in the size of the perturbation. However, the complex still maintained a residual influence on the lateralisation of the pure tone even for the largest asynchrony used (Experiment 5). Experiment 6 confirmed that the lateralisation of the tonal complex was consistent with the aggregation of binaural information across frequency. The second set of experiments used a signal detection paradigm to investigate whether temporal context influences binaural processing. Sequentially capturing an 800-Hz interferer tone into a separate perceptual stream to that of a 400-Hz target significantly reduced the amount of binaural interference (Experiments 7 -9), although this result may have been mediated by peripheral rather than central processes (Experiment 10). The implications of the results for models of auditory processing of complex sounds are discussed.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available
Keywords: Psychology