This article has been reviewed according to Science X's editorial process and policies. Editors have highlighted the following attributes while ensuring the content's credibility: The temporal structure of speech rhythms resembles that of the communication signals of numerous animal species. This is shown by a study conducted by a research team from the Leibniz Center for General Linguistics (ZAS) in Berlin, Humboldt Universität zu Berlin, the University of Regensburg and the Institute for Advanced Studies at Aix-Marseille University.
For the study, speech recordings from 48 languages across all inhabited continents were analyzed and compared with rhythmic data from animal species such as fish, seals and birds. The aim was to determine whether the rhythm of human speech is unique and, if not, how it fits into a broader biological pattern across species. The study was published in the journal Annals of the New York Academy of Sciences.
The analysis focused on so-called "inter-onset intervals": contiguous segments of speech and a following pause. This unit is also used in research into animal communication signals, enabling a direct comparison between humans and animals. The data set comprised the Language Documentation Reference Corpus (DoReCo), which contains speech recordings from numerous, often underresearched languages, as well as various rhythmic metrics for animals already described in the literature.
The study analyzed more than 100,000 such intervals and revealed a strikingly similar duration of around 2 seconds across all 48 languages. This consistency held true regardless of language family or the individual characteristics of the speakers. A subsequent comparison with data from research into animal communication revealed that the human speech rhythm falls within the range also described in, for example, the Cape fur seal, brown meagre or skylark.
The research team cites physiological factors, such as breathing rhythm, which limits the length of contiguous intervals, as a possible explanation for the observed regularity. Limitations of working memory could also play a role. The results suggest that the fundamental temporal organization of human communication may stem from mechanisms shared by humans and other animal species.
"When the speech rhythm is calculated in the way it is frequently studied in animal communication, there are significantly fewer differences between the languages examined on this timescale than is the case with smaller linguistic units such as syllables. This suggests that biological factors play an important role here," says Susanne Fuchs, senior researcher at the ZAS Berlin and co-author of the study. Ludger Paschen, co-editor of the DoReCo corpus, adds, "Our study demonstrates how language documentation data from low-resource and endangered languages can be reused to clarify fundamental questions regarding the status of human language." Lara S.
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