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dc.contributor.authorBoehnke, Susan E.en_US
dc.date.accessioned2014-10-21T12:38:41Z
dc.date.available2014-10-21T12:38:41Z
dc.date.issued2003en_US
dc.identifier.otherAAINQ79401en_US
dc.identifier.urihttp://hdl.handle.net/10222/55901
dc.descriptionTwo sounds will be given different location percepts if they are presented to different ears (EAR), if they have different interaural level differences (ILD) or different interaural time differences (ITD). If the sound sources are located in different lateral hemifields in free-field space, they will have different ITDs (coded in low-frequency channels), and frequency-dependent ILDs imposed by the head-related transfer function. The role of such spatial stimulus attributes in the segregation of spectrally identical sound sources was evaluated by exploiting the fact that temporal judgments made between sounds perceived as emanating from different sources are impaired relative to those made for single sources. Auditory temporal gap detection and sequential stream segregation paradigms were used to provide measures of this impairment.en_US
dc.descriptionAcross 5 experiments, the ability to detect a silent interval (gap) between two noise bursts (markers) that differed only in spatial stimulus attributes was determined under binaural and monaural listening, in the free-field and over headphones. Gap detection thresholds were most elevated for markers presented to different ears, moderately and equally elevated for markers presented with different ILDs or monaurally at different levels, but not elevated if markers were presented with different ITDs. Consistent with the foregoing, free-field separation elevated thresholds for wideband and high-pass markers, for which large marker level differences were present at each ear, but not for low-pass markers which differed only in ITD. In general, gap detection performance for spatially separated markers in the free field decreased as a function of marker differences in intensive and spectral characteristics at each ear. The pattern of impairment of gap thresholds with marker spatial separation was highly correlated with the pattern of improvement in signal detection with spatial separation from a masking noise (Saberi et al, 1991; Gilkey and Good, 1995). Sequential stream segregation of repeating ABA_ sequences, where A and B were noise bursts differing only in spatial stimulus attributes, followed a similar pattern of sensitivity. (Abstract shortened by UMI.)en_US
dc.descriptionThesis (Ph.D.)--Dalhousie University (Canada), 2003.en_US
dc.languageengen_US
dc.publisherDalhousie Universityen_US
dc.publisheren_US
dc.subjectBiology, Neuroscience.en_US
dc.subjectPsychology, Physiological.en_US
dc.titleThe effect of spatial stimulus attributes on auditory temporal processing tasks.en_US
dc.typetexten_US
dc.contributor.degreePh.D.en_US
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