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Acuity of sound localisation: A topography of auditory space. II. Pinna cues absent

Version 2 2024-06-04, 15:19
Version 1 2022-01-12, 08:46
journal contribution
posted on 2024-06-04, 15:19 authored by SR Oldfield, Simon ParkerSimon Parker
The acuity of azimuth and elevation discrimination was measured under conditions in which the cues to localisation provided by the pinnae were removed. Four subjects localised a sound source (white noise through a speaker) which varied in position over a range of elevations (-40° to +40°) and azimuths (0° to 180°), at 10° intervals, on the left side of the head. Pinna cues were removed by the insertion of individually cast moulds in both pinnae. Each mould had an access hole to the auditory canal. The absolute and algebraic, azimuth and elevation errors were measured for all subjects at each position of the source. The variability of azimuth and elevation error was also computed. The performance of the subjects was compared to their performance under normal hearing conditions. Insertion of the pinnae moulds was found to increase substantially elevation error and the number of front/back reversals. The importance of the cues provided by the pinnae in these discriminations was thus confirmed. However, the increase in elevation error did not result in a corresponding increase in azimuth error. These findings provide support for the proposition that azimuth and elevation discrimination are coded independently.

History

Journal

Perception

Volume

13

Pagination

601-617

Location

United States

ISSN

0301-0066

eISSN

1468-4233

Language

en

Publication classification

C1.1 Refereed article in a scholarly journal

Issue

5

Publisher

SAGE Publications

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