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Accurate sound source localization has advantages for the performance of work by humans. The ability to accurately localize sound sources contributes to perception, decision making and task performance. Two studies were conducted to investigate the prevalence of accurate sound source localization and the enhancement that spatially separated sound source locations can have on speech perception. The first study was conducted to characterize the ability to detect the location of horizontal plane sound sources. A sample of 117 participants with the hearing capacity within the normal limits participated in the study. The results indicated that sound sources located towards the front of the participant were identified more frequently than those sound sources located towards the rear positions. Based on the results found in the first study, a second study was conducted to assess performance within a listening task. Three different spatial configurations were used to assess if similar trends in performance translated to sound sources through headphones. Fifteen research participants performed a Coordinated Response Measure (CRM) task requiring the identification of a speech phrase and its associated information for a diotic configuration and two different spatial sound source configurations. Performance measured for the diotic configuration was significantly (p(0.05) less than for the two spatial configurations. The current studies indicate distinct advantages of utilizing localized sound sources to present auditory signal and speech to listeners.

Horizontal plane sound source localization and auditory enhancement