Does the environment constrain avian sound localization?

Anais da Academia Brasileira de Ciências

Ole N. Larsen¹ 

[1] ,University of Southern Denmark Institute of Biology Centre for Sound CommunicationOdense,Denmark

关键词: directional hearing;    elevation;    azimuth angle;    precedence effect;    audição direcional;    elevação (ângulo vertical);    azimute;    efeito de precedência;   

DOI  :  10.1590/S0001-37652004000200013

来源: SciELO

【 摘 要 】

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.

【 授权许可】

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