Vocal-tract filtering by lingual articulation in a parrot

Gabriël J L Beckers, Brian S. Nelson, Roderick Suthers

Research output: Contribution to journalArticle

57 Citations (Scopus)

Abstract

Human speech and bird vocalization are complex communicative behaviors with notable similarities in development and underlying mechanisms [1]. However, there is an important difference between humans and birds in the way vocal complexity is generally produced. Human speech originates from independent modulatory actions of a sound source, e.g., the vibrating vocal folds, and an acoustic filter, formed by the resonances of the vocal tract (formants) [2]. Modulation in bird vocalization, in contrast, is thought to originate predominantly from the sound source [3], whereas the role of the resonance filter is only subsidiary in emphasizing the complex time-frequency patterns of the source (e.g., [4-7], but see [8]). However, it has been suggested that, analogous to human speech production [9], tongue movements observed in parrot vocalizations modulate formant characteristics independently from the vocal source [10-15]. As yet, direct evidence of such a causal relationship is lacking. In five Monk parakeets, Myiopsitta monachus, we replaced the vocal source, the syrinx, with a small speaker that generated a broad-band sound, and we measured the effects of tongue placement on the sound emitted from the beak. The results show that tongue movements cause significant frequency changes in two formants and cause amplitude changes in all four formants present between 0.5 and 10 kHz. We suggest that lingual articulation may thus in part explain the well-known ability of parrots to mimic human speech, and, even more intriguingly, may also underlie a speech-like formant system in natural parrot vocalizations.

Original languageEnglish
Pages (from-to)1592-1597
Number of pages6
JournalCurrent Biology
Volume14
Issue number17
DOIs
StatePublished - Sep 7 2004

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Parrots
parrots
tongue
Tongue
vocalization
Birds
Acoustic waves
birds
Parakeets
Beak
Monachus
parakeets
Syringes
Aptitude
Vocal Cords
syringes
beak
Acoustics
acoustics
Modulation

ASJC Scopus subject areas

  • Agricultural and Biological Sciences(all)

Cite this

Vocal-tract filtering by lingual articulation in a parrot. / Beckers, Gabriël J L; Nelson, Brian S.; Suthers, Roderick.

In: Current Biology, Vol. 14, No. 17, 07.09.2004, p. 1592-1597.

Research output: Contribution to journalArticle

Beckers, Gabriël J L ; Nelson, Brian S. ; Suthers, Roderick. / Vocal-tract filtering by lingual articulation in a parrot. In: Current Biology. 2004 ; Vol. 14, No. 17. pp. 1592-1597.
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