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• W2161445832 startingPage "e77671" @default.
• W2161445832 abstract "Bottlenose dolphins (Tursiops truncatus) produce many vocalisations, including whistles that are unique to the individual producing them. Such “signature whistles” play a role in individual recognition and maintaining group integrity. Previous work has shown that humans can successfully group the spectrographic representations of signature whistles according to the individual dolphins that produced them. However, attempts at using mathematical algorithms to perform a similar task have been less successful. A greater understanding of the encoding of identity information in signature whistles is important for assessing similarity of whistles and thus social influences on the development of these learned calls. We re-examined 400 signature whistles from 20 individual dolphins used in a previous study, and tested the performance of new mathematical algorithms. We compared the measure used in the original study (correlation matrix of evenly sampled frequency measurements) to one used in several previous studies (similarity matrix of time-warped whistles), and to a new algorithm based on the Parsons code, used in music retrieval databases. The Parsons code records the direction of frequency change at each time step, and is effective at capturing human perception of music. We analysed similarity matrices from each of these three techniques, as well as a random control, by unsupervised clustering using three separate techniques: k-means clustering, hierarchical clustering, and an adaptive resonance theory neural network. For each of the three clustering techniques, a seven-level Parsons algorithm provided better clustering than the correlation and dynamic time warping algorithms, and was closer to the near-perfect visual categorisations of human judges. Thus, the Parsons code captures much of the individual identity information present in signature whistles, and may prove useful in studies requiring quantification of whistle similarity." @default.
• W2161445832 created "2016-06-24" @default.
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• W2161445832 date "2013-10-23" @default.
• W2161445832 modified "2023-10-03" @default.
• W2161445832 title "The Encoding of Individual Identity in Dolphin Signature Whistles: How Much Information Is Needed?" @default.
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• W2161445832 doi "https://doi.org/10.1371/journal.pone.0077671" @default.
• W2161445832 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/3806847" @default.
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