The adult male Diana monkeys (Cercopithecus diana) produce predator-specific alarm calls in response to two of their predators, the crowned eagles and the leopards. The acoustic structure of these alarm calls is remarkable for a number of theoretical and empirical reasons. First, although pulsed phonation has been described in a variety of mammalian vocalizations, very little is known about the underlying production mechanism. Second, Diana monkey alarm calls are based almost exclusively on this vocal production mechanism to an extent that has never been documented in mammalian vocal behavior. Finally, the Diana monkeys’ pulsed phonation strongly resembles the pulse register in human speech, where fundamental frequency is mainly controlled by subglottal pressure. Here, we report the results of a detailed acoustic analysis to investigate the production mechanism of Diana monkey alarm calls. Within calls, we found a positive correlation between the fundamental frequency and the pulse amplitude, suggesting that both humans and monkeys control fundamental frequency by subglottal pressure. While in humans pulsed phonation is usually considered pathological or artificial, male Diana monkeys rely exclusively on pulsed phonation, suggesting a functional adaptation. Moreover, we were unable to document any nonlinear phenomena, despite the fact that they occur frequently in the vocal repertoire of humans and nonhumans, further suggesting that the very robust Diana monkey pulse production mechanism has evolved for a particular functional purpose. We discuss the implications of these findings for the structural evolution of Diana monkey alarm calls and suggest that the restricted variability in fundamental frequency and robustness of the source signal gave rise to the formant patterns observed in Diana monkey alarm calls, used to convey predator information.
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May 05 2003
Pulse register phonation in Diana monkey alarm calls
Tobias Riede;
Tobias Riede
Department of Psychology, 245 Uris Hall, Cornell University, Ithaca, New York 14853
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Klaus Zuberbühler
Klaus Zuberbühler
School of Psychology, University of St. Andrews, St. Andrews, Fife KY 16 9JU, Scotland, United Kingdom
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J. Acoust. Soc. Am. 113, 2919–2926 (2003)
Article history
Received:
October 04 2002
Accepted:
February 24 2003
Citation
Tobias Riede, Klaus Zuberbühler; Pulse register phonation in Diana monkey alarm calls. J. Acoust. Soc. Am. 1 May 2003; 113 (5): 2919–2926. https://doi.org/10.1121/1.1567278
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