Respiratory movements during vocalization in the squirrel monkey

Häusler, Udo

doi:10.1007/978-3-662-00932-1_9

Cited by 1 publication

(1 citation statement)

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“…To produce a constant amplitude course, it is necessary to establish a specific tension of the vocal folds together with a specific lung pressure. Without this combination no audible sound can be produced ( Häusler 1996). As mentioned above, mean gap length is the only parameter which could not be partialed out by weight.…”

Section: Discussionmentioning

confidence: 99%

Changes In Rhesus Macaque ‘Coo’ Vocalizations during Early Development

Hammerschmidt¹,

Newman²,

Champoux³

et al. 2000

Ethology

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In order to test whether ‘coo’ calls of young rhesus macaques, Macaca mulatta, undergo some modifications during early development, and to explore which factors may influence these changes, we studied the ontogeny of their contact call, the ‘coo’ call. Vocalizations were recorded during brief periods of social separation. Infants were either raised with their mothers and other conspecifics, or separated from their mothers at birth and housed in a nursery with other infants. We recorded calls uttered in the separation context from 20 infants. We digitized the first 50 calls of a given series and subjected them to a Fourier transform. From each frequency–time spectrum, we extracted 65 acoustic parameters using a software program (LMA 5.9). We then used a cluster analysis to separate the ‘coo’ calls from other call types. With increasing age, the ‘coos’ dropped in pitch and became more even. The course of amplitude became more constant and the call duration increased slightly. Nevertheless, we found a high intra‐individual variation throughout the 5 mo. Neither rearing condition nor sex had any apparent influence on age‐related changes in ‘coo’ structure. With one exception, all parameters that correlated with age could be explained by variation in weight. Therefore, we conclude that growth is the main factor accounting for the observed changes.

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Section: Discussionmentioning

confidence: 99%