Jump to Content
View Cart
You are logged out of this journal. Log In
Nonlinear analysis of irregular animal vocalizations
J. Acoust. Soc. Am. Volume 111, Issue 6, pp. 2908-2919 (2002); (12 pages)
Alerts
Alert Me When Cited
Alert Me When Corrected
Tools
Download Citation
Add to MyScitation
Permissions / Reprints
Blog This Article
Print-Friendly
Research Toolkit
Share
Email Abstract
CiteULike
del.icio.us
BibSonomy
Tweet this Article
Add to FacebookAnimal vocalizations range from almost periodic vocal-fold vibration to completely atonal turbulent noise. Between these two extremes, a variety of nonlinear dynamics such as limit cycles, subharmonics, biphonation, and chaotic episodes have been recently observed. These observations imply possible functional roles of nonlinear dynamics in animal acoustic communication. Nonlinear dynamics may also provide insight into the degree to which detailed features of vocalizations are under close neural control, as opposed to more directly reflecting biomechanical properties of the vibrating vocal folds themselves. So far, nonlinear dynamical structures of animal voices have been mainly studied with spectrograms. In this study, the deterministic versus stochastic (DVS) prediction technique was used to quantify the amount of nonlinearity in three animal vocalizations: macaque screams, piglet screams, and dog barks. Results showed that in vocalizations with pronounced harmonic components (adult macaque screams, certain piglet screams, and dog barks), deterministic nonlinear prediction was clearly more powerful than stochastic linear prediction. The difference, termed low-dimensional nonlinearity measure (LNM), indicates the presence of a low-dimensional attractor. In highly irregular signals such as juvenile macaque screams, piglet screams, and some dog barks, the detectable amount of nonlinearity was comparatively small. Analyzing 120 samples of dog barks, it was further shown that the harmonic-to-noise ratio (HNR) was positively correlated with LNM. It is concluded that nonlinear analysis is primarily useful in animal vocalizations with strong harmonic components (including subharmonics and biphonation) or low-dimensional chaos. © 2002 Acoustical Society of America.
© 2002 Acoustical Society of America
RELATED DATABASES
To view database links for this article,
you need to log in.
KEYWORDS and PACS
ARTICLE DATA
History
Received 20 Oct 2001
Accepted 08 Mar 2002
Revised 06 Mar 2002
Accepted 08 Mar 2002
Revised 06 Mar 2002
Digital Object Identifier
For access to fully linked references, you need to log in.
For access to citing articles, you need to log in.
This Publication
Scitation
Google Scholar
PubMed