Abstract：
:Echolocation offers a promising approach to improve the quality of life of people with blindness although little is known about the factors influencing object localisation using a 'searching' strategy. In this paper, we describe a series of experiments using sighted and blind human listeners and a 'virtual auditory space' technique to investigate the effects of the distance and orientation of a reflective object and the effect of stimulus bandwidth on ability to identify the right-versus-left position of the object, with bands of noise and durations from 10-400 ms. We found that performance reduced with increasing object distance. This was more rapid for object orientations where mirror-like reflection paths do not exist to both ears (i.e., most possible orientations); performance with these orientations was indistinguishable from chance at 1.8 m for even the best performing listeners in other conditions. Above-chance performance extended to larger distances when the echo was artificially presented in isolation, as might be achieved in practice by an assistive device. We also found that performance was primarily based on information above 2 kHz. Further research should extend these investigations to include other factors that are relevant to real-life echolocation.
journal_name
Hear Resjournal_title
Hearing researchauthors
Rowan D,Papadopoulos T,Edwards D,Holmes H,Hollingdale A,Evans L,Allen Rdoi
10.1016/j.heares.2013.03.005subject
Has Abstractpub_date
2013-06-01 00:00:00pages
56-65eissn
0378-5955issn
1878-5891pii
S0378-5955(13)00073-7journal_volume
300pub_type
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