How parrots talk: insights based on CT scans, image processing, and mathematical models

@inproceedings{Patterson1997HowPT,
  title={How parrots talk: insights based on CT scans, image processing, and mathematical models},
  author={D. Patterson and I. Pepperberg and B. Story and E. Hoffman},
  booktitle={Medical Imaging},
  year={1997}
}
Little is known about mechanisms of speech production in parrots. Recently, however, techniques for correlating vocal tract shape with vowel production in humans have become more sophisticated and we have adapted these techniques for use with parrots. We scanned two grey parrot heads with intact vocal tracts. One specimen, 'Oldbird' was fixed with its beak propped open; the second 'Youngbird' was fixed with its beak closed. Using VIDA software, we (1) established that differences in tongue and… Expand
Measurement of grey parrot (Psittacus erithacus) trachea via magnetic resonance imaging, dissection, and electron beam computed tomography
TLDR
Comparing results for tracheal measurements provided by magnetic resonance imaging of a live bird, caliper measurements of four preserved specimens, and electron beam computed tomography of three of these preserved specimens suggests how noninvasive techniques can be used for cross‐species comparisons, including the coevolution of structure and function in avian mimicry. Expand
Vocal tract articulation revisited: the case of the monk parakeet
TLDR
X-ray cinematographic imaging of naturally vocalizing monk parakeets was used to assess which articulators are possibly involved in vocal tract filtering in this species, and strong positive correlations between beak opening and amplitude as well as changes in tongue height and amplitude in several types of vocalization were found. Expand
In Search of King Solomon’s Ring: Cognitive and Communicative Studies of Grey Parrots (Psittacus erithacus)
  • I. Pepperberg
  • Psychology, Medicine
  • Brain, Behavior and Evolution
  • 2002
TLDR
Examining how input affects the extent to which parrots acquire an allospecific code may elucidate mechanisms of other forms of exceptional learning: learning unlikely in the normal course of development but that can occur under certain conditions. Expand
The frame/content theory of evolution of speech production.
  • P. MacNeilage
  • Psychology, Medicine
  • The Behavioral and brain sciences
  • 1998
TLDR
The new role of Broca's area and its surround in human vocal communication may have derived from its evolutionary history as the main cortical center for the control of ingestive processes. Expand
The Avian Lingual and Laryngeal Apparatus Within the Context of the Head and Jaw Apparatus, with Comparisons to the Mammalian Condition: Functional Morphology and Biomechanics of Evaporative Cooling, Feeding, Drinking, and Vocalization
TLDR
This chapter will concentrate on the functional-morphological interdependences and interactions of the lingual and laryngeal apparatus with each other and with the skull and jaw apparatus. Expand

References

SHOWING 1-10 OF 11 REFERENCES
Bill opening and sound spectrum in barnacle goose loud calls: individuals with ‘wide mouths’ have higher pitched voices
TLDR
It is argued that differential emphases of frequencies can be at least partially achieved through the degree of opening of the bill, and this hypothesis is tested for barnacle goose, Branta leucopsis, loud calls. Expand
Vocal tract area functions from magnetic resonance imaging.
TLDR
Comparisons of formant locations extracted from the natural (recorded) speech of theImaged subject and from simulations using the newly acquired area functions show reasonable similarity but suggest that the imaged vocal tract shapes may be somewhat centralized. Expand
Kinematics of birdsong: functional correlation of cranial movements and acoustic features in sparrows.
TLDR
It is found that the acoustic frequencies of notes in a song have a consistent, positive correlation with beak gape in both species and cranial kinematics, particularly beak movements, influence the resonance properties of the vocal tract by varying its physical dimensions and thus play an active role in the production of birdsong. Expand
Vocal tract resonances in oscine bird sound production: evidence from birdsongs in a helium atmosphere
TLDR
Not only does the songbird's vocal tract act as an acoustic filter, but its filter characteristics are actively coordinated with the output of the syrinx, suggesting that birdsong and human phonation are more analogous than previously thought. Expand
The Science of Sound
How are different sounds made? If we could see sound, it would look like waves. The length, speed, and direction of each wave determine what kind of sound we hear. Height is also a factor. Each waveExpand
Some biological constraints on the analysis ofprosody." Signal to Syntax: Bootstrappingfrom Speech to Grammar in EarlyAcquisition
  • 1996
" A comparative study ofhuman and parrot phonation : Acoustic and articulatory correlates ofvowels
  • J . Acoust . Soc . Amer .
  • 1994
Pepperberg, "A comparative study ofhuman and parrot phonation: Acoustic and articulatory correlates
  • ofvowels," J. Acoust. Soc. Amer
  • 1994
Greenewalt, BirdSong: Acoustics andPhysiology
  • 1968
Bird voices and resonant tuning in helium-air mixtures,
  • Ph.D. Thesis, Univ. California,
  • 1966
...
1
2
...