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Does the environment constrain avian sound localization?

Authors
  • Larsen, Ole N
Type
Published Article
Journal
Anais da Academia Brasileira de Ciências
Publication Date
Jun 01, 2004
Volume
76
Issue
2
Pages
267–273
Identifiers
PMID: 15258638
Source
Medline
License
Unknown

Abstract

A bird needs to keep track not only of social interactions of conspecifics but also of their changing locations in space by determining their directions and distances. Current knowledge of accuracy in the computation of sound source location by birds is still insufficient, partly because physiological mechanisms of few species are studied in well defined laboratory settings, while field studies are performed in a variety of species and complex environments. Velocity gradients and reverberating surfaces may conceivably induce inaccuracy in sound source location (mainly elevation) by distorting the directional cues. However, most birds possess an inherently directional pressure difference receiver, which enhances the directional cues (mainly azimuth), and a computational mechanism in their auditory pathways to suppress echoes of redirected sound.

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