### Abstract

Long-range correlations are found in symbolic sequences from human language, music and DNA. Determining the span of correlations in dolphin whistle sequences is crucial for shedding light on their communicative complexity. Dolphin whistles share various statistical properties with human words, i.e.Zipf's law for word frequencies (namely that the probability of the ith most frequent word of a text is about i ^{-α}) and a parallel of the tendency of more frequent words to have more meanings. The finding of Zipf's law for word frequencies in dolphin whistles has been the topic of an intense debate on its implications. One of the major arguments against the relevance of Zipf's law in dolphin whistles is that it is not possible to distinguish the outcome of a die-rolling experiment from that of a linguistic or communicative source producing Zipf's law for word frequencies. Here we show that statistically significant whistle-whistle correlations extend back to the second previous whistle in the sequence, using a global randomization test, and to the fourth previous whistle, using a local randomization test. None of these correlations are expected by a die-rolling experiment and other simple explanations of Zipf's law for word frequencies, such as Simon's model, that produce sequences of unpredictable elements.

Original language | English (US) |
---|---|

Article number | P06002 |

Journal | Journal of Statistical Mechanics: Theory and Experiment |

Volume | 2012 |

Issue number | 6 |

DOIs | |

State | Published - Jun 2012 |

### Fingerprint

### Keywords

- communication
- sequence analysis (experiment)
- stochastic processes
- supply and information networks

### ASJC Scopus subject areas

- Statistics and Probability
- Statistical and Nonlinear Physics
- Statistics, Probability and Uncertainty

### Cite this

*Journal of Statistical Mechanics: Theory and Experiment*,

*2012*(6), [P06002]. https://doi.org/10.1088/1742-5468/2012/06/P06002

**The span of correlations in dolphin whistle sequences.** / Ferrer-I-Cancho, Ramon; Mccowan, Brenda.

Research output: Contribution to journal › Article

*Journal of Statistical Mechanics: Theory and Experiment*, vol. 2012, no. 6, P06002. https://doi.org/10.1088/1742-5468/2012/06/P06002

}

TY - JOUR

T1 - The span of correlations in dolphin whistle sequences

AU - Ferrer-I-Cancho, Ramon

AU - Mccowan, Brenda

PY - 2012/6

Y1 - 2012/6

N2 - Long-range correlations are found in symbolic sequences from human language, music and DNA. Determining the span of correlations in dolphin whistle sequences is crucial for shedding light on their communicative complexity. Dolphin whistles share various statistical properties with human words, i.e.Zipf's law for word frequencies (namely that the probability of the ith most frequent word of a text is about i -α) and a parallel of the tendency of more frequent words to have more meanings. The finding of Zipf's law for word frequencies in dolphin whistles has been the topic of an intense debate on its implications. One of the major arguments against the relevance of Zipf's law in dolphin whistles is that it is not possible to distinguish the outcome of a die-rolling experiment from that of a linguistic or communicative source producing Zipf's law for word frequencies. Here we show that statistically significant whistle-whistle correlations extend back to the second previous whistle in the sequence, using a global randomization test, and to the fourth previous whistle, using a local randomization test. None of these correlations are expected by a die-rolling experiment and other simple explanations of Zipf's law for word frequencies, such as Simon's model, that produce sequences of unpredictable elements.

AB - Long-range correlations are found in symbolic sequences from human language, music and DNA. Determining the span of correlations in dolphin whistle sequences is crucial for shedding light on their communicative complexity. Dolphin whistles share various statistical properties with human words, i.e.Zipf's law for word frequencies (namely that the probability of the ith most frequent word of a text is about i -α) and a parallel of the tendency of more frequent words to have more meanings. The finding of Zipf's law for word frequencies in dolphin whistles has been the topic of an intense debate on its implications. One of the major arguments against the relevance of Zipf's law in dolphin whistles is that it is not possible to distinguish the outcome of a die-rolling experiment from that of a linguistic or communicative source producing Zipf's law for word frequencies. Here we show that statistically significant whistle-whistle correlations extend back to the second previous whistle in the sequence, using a global randomization test, and to the fourth previous whistle, using a local randomization test. None of these correlations are expected by a die-rolling experiment and other simple explanations of Zipf's law for word frequencies, such as Simon's model, that produce sequences of unpredictable elements.

KW - communication

KW - sequence analysis (experiment)

KW - stochastic processes

KW - supply and information networks

UR - http://www.scopus.com/inward/record.url?scp=84863335821&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84863335821&partnerID=8YFLogxK

U2 - 10.1088/1742-5468/2012/06/P06002

DO - 10.1088/1742-5468/2012/06/P06002

M3 - Article

AN - SCOPUS:84863335821

VL - 2012

JO - Journal of Statistical Mechanics: Theory and Experiment

JF - Journal of Statistical Mechanics: Theory and Experiment

SN - 1742-5468

IS - 6

M1 - P06002

ER -