The rhythm of horse gaits DOI Creative Commons
Lia Laffi, Teresa Raimondi,

Claudio Ferrante

и другие.

Annals of the New York Academy of Sciences, Год журнала: 2024, Номер unknown

Опубликована: Дек. 28, 2024

Abstract What makes animal gaits so audibly rhythmic? To answer this question, we recorded the footfall sound of 19 horses and quantified rhythmic differences in temporal structure three natural gaits: walk, trot, canter. Our analyses show that each gait displays a strikingly specific pattern all are organized according to small‐integer ratios, those found when adjacent intervals related by mathematically simple relationship integer numbers. Walk trot exhibit an isochronous (1:1)—similar ticking clock—while canter is characterized ratios (1:1, 1:2, 2:1). While walk both isochrony, has slower tempo more precise accurate, like metronome. results quantitatively discriminate horse based on rhythm, revealing striking commonalities with human music some communicative signals. Gait vocal rhythmicity share key features, former likely predates latter; suggest supports gait‐based hypotheses for evolution rhythm. Specifically, perception locomotor may have evolved different species under pressure predator recognition mate selection; it been later exapted communication.

Язык: Английский

Singing out of tune: sexual and developmental differences in the occurrence of nonlinear phenomena in primate songs DOI Creative Commons
Chiara De Gregorio, Daria Valente, Walter Cristiano

и другие.

Philosophical Transactions of the Royal Society B Biological Sciences, Год журнала: 2025, Номер 380(1923)

Опубликована: Апрель 3, 2025

Animal vocalizations contain a varying degree of nonlinear phenomena (NLP) caused by irregular or chaotic vocal organ dynamics. Several hypotheses have been proposed to explain NLP presence, from unintentional by-products poor technique having functional communicative role. We aimed disentangle the role sex, age and physiological constraints in occurrence songs lemur Indri indri , which are complex harmonic displays organized phrases. Age sex affected presence type songs. In particular, proportion considered decreased with age, except for subharmonics. Subharmonics potentially mediate perception lower pitch, making signallers appear larger. frequency jumps occurred lower-pitched notes than regular units, while chaos sidebands higher-pitched units. This suggests that different types can be associated constraints. Finally, indris might present short-term fatigue, units occurring last position phrase highest probability containing NLP. The result proximate causes, such as constraints, ultimate evolutionary pressures, shaped article is part theme issue ‘Nonlinear vertebrate vocalizations: mechanisms functions’.

Язык: Английский

Процитировано

8
Rhythmic categories in horse gait kinematics DOI Creative Commons
Lia Laffi,

Félix Bigand,

Christian Peham

и другие.

Journal of Anatomy, Год журнала: 2025, Номер unknown

Опубликована: Янв. 15, 2025

Abstract Anecdotally, horses' gaits sound rhythmic. Are they really? In this study, we quantified the motor rhythmicity of horses across three different (walk, trot, and canter). For first time, adopted quantitative tools from bioacoustics music cognition to quantify locomotor rhythmicity. Specifically, tested whether kinematics data contained rhythmic categories; these occur when adjacent temporal intervals are categorically, rather than randomly, distributed. We extracted motion cycle duration (t k ) two ipsilateral hooves 13 ridden calculated ratios successive t values. significantly fell within categories how close were small‐integer ratios, a feature also present in animal vocalizations human music. found strong isochronous pattern—a 1:1 ratio, corresponding ticking clock—in single limbs for all gaits. analyzed interlimb coordination hooves' impacts identify differences associated with biomechanical patterns an pattern trot 1:3 3:1 walk canter. Our findings step toward quantifying horse locomotion potentially resulting sounds, possible implications as detect gait irregularities. Overall, show that valuable tool kinematic analysis can be used domain.

Язык: Английский

Процитировано

2
Isochrony in titi monkeys duets: social context as a proximate cause of duets’ rhythm and regularity DOI Creative Commons
Chiara De Gregorio,

P. Antonini,

Eckhard W. Heymann

и другие.

Proceedings of the Royal Society B Biological Sciences, Год журнала: 2025, Номер 292(2041)

Опубликована: Фев. 1, 2025

Music and rhythm are typical features of all human cultures, but their biological origins remain unclear. Recent investigations suggest that rhythmic music shared with animal vocalizations. Moreover, arousal is known to influence the structure both speech sounds. We investigated coppery titi monkeys’ ( Plecturocebus cupreus ) duet rhythms assess adherence patterns previously observed only in Old World primates deepen our understanding proximate causes non-human primate song rhythm. Titis’ songs were remarkably isochronous, tempo depended on social context: sung during territorial confrontations have a slower pace than early morning singing. Songs had faster less regular when infants present, suggesting speed-accuracy trade-off. Finally, we found pair-mates perform isochronous same precision, isochrony plays role boosting pair coordination, as it does other singing primates. Our investigation sheds light ultimate primates’ rhythm, knowledge confirming its presence for first time New monkey highlighting factors shaping timing regularity short term.

Язык: Английский

Процитировано

1
Direct Effects of Bipedalism on Early Hominin Fetuses Stimulated Later Musical and Linguistic Evolution DOI
Matz Larsson, Dean Falk

Current Anthropology, Год журнала: 2025, Номер unknown, С. 000 - 000

Опубликована: Фев. 21, 2025

Язык: Английский

Процитировано

0
Rhythmic Analysis in Animal Communication, Speech, and Music: The Normalized Pairwise Variability Index Is a Summary Statistic of Rhythm Ratios DOI Creative Commons
Yannick Jadoul,

Francesca D’Orazio,

Vesta Eleuteri

и другие.

Vibration, Год журнала: 2025, Номер 8(2), С. 12 - 12

Опубликована: Март 24, 2025

Rhythm is fundamental in many physical and biological systems. relevant to a broad range of phenomena across different fields, including animal bioacoustics, speech sciences, music cognition. As result, the interest developing consistent quantitative measures for cross-disciplinary rhythmic analysis growing. Two that can be directly applied any temporal structure are normalized pairwise variability index (nPVI) rhythm ratios (rk). The nPVI summarizes overall isochrony sequence, i.e., how regularly spaced sequence’s events are, as single value. Meanwhile, rk quantifies between adjacent intervals often used identifying categories. Here, we show these two fundamentally connected: summary static values sequence. This result offers deeper understanding applied. It also opens door creating novel, custom quantify patterns based on distribution compare domains. explicit connection one further step towards common toolkit research disciplines.

Язык: Английский

Процитировано

0
A cooperatively breeding mouse shows flexible use of its vocal repertoire according to social context DOI Creative Commons
Léo Perrier,

Aude de Witasse-Thézy,

Aurélie Pradeau

и другие.

Behavioural Brain Research, Год журнала: 2025, Номер 486, С. 115575 - 115575

Опубликована: Апрель 5, 2025

Mice exchange information using chemical, visual and acoustic signals. Long ignored, mouse ultrasonic communication is now considered to be an important aspect of their social life, transferring such as individual identity or stress levels. However, whether how mice modulate communications largely unknown. Here we show that the cooperatively breeding African striped Rhabdomys pumilio controls its vocal production both qualitatively quantitatively, depending on naturally relevant context. By conducting controlled experiments in captivity, found a repertoire consisting seven vocalisation types, which it uses differently different types interactions. Familiar individuals same sex vocalise more than two unfamiliar same-sex individuals. The greatest diversity vocalisations was recorded during encounter between female male, suggesting certain are mainly used for courtship. Our results highlight familiar may alternate while tend overlap one another. These observations suggest control temporal dynamics vocalisations, addressing targeted specific receivers via channel.

Язык: Английский

Процитировано

0
Evolution and development of vocal communication in primates DOI
Renata B. Biazzi, Asif A. Ghazanfar

Elsevier eBooks, Год журнала: 2025, Номер unknown

Опубликована: Янв. 1, 2025

Язык: Английский

Процитировано

0
Third‐order self‐embedded vocal motifs in wild orangutans, and the selective evolution of recursion DOI Creative Commons
Chiara De Gregorio, Marco Gamba, Adriano R. Lameira

и другие.

Annals of the New York Academy of Sciences, Год журнала: 2025, Номер unknown

Опубликована: Май 16, 2025

Abstract Recursion, the neuro‐computational operation of nesting a signal or pattern within itself, lies at structural basis language. Classically considered absent in vocal repertoires nonhuman animals, whether recursion evolved step‐by‐step saltationally humans is among most fervent debates cognitive science since Chomsky's seminal work on syntax 1950s. The recent discovery self‐embedded motifs wild (nonhuman) great apes—Bornean male orangutans’ long calls—lends initial but important support to notion that recursion, least temporal not uniquely human hominids and its evolution was based shared ancestry. Building these findings, we test four necessary predictions for gradual evolutionary scenario Sumatran female alarm calls, longest known combinations consonant‐like vowel‐like calls apes (excepting humans). From data, propose third‐order isochrony: three hierarchical levels nested isochronous combinatoric units, with each level exhibiting unique variation dynamics information content relative context. Our findings confirm recursive operations underpin ape call combinatorics, likely gradually lineage as sequences became longer more intricate.

Язык: Английский

Процитировано

0
The rhythm of horse gaits DOI Creative Commons
Lia Laffi, Teresa Raimondi,

Claudio Ferrante

и другие.

Annals of the New York Academy of Sciences, Год журнала: 2024, Номер unknown

Опубликована: Дек. 28, 2024

Abstract What makes animal gaits so audibly rhythmic? To answer this question, we recorded the footfall sound of 19 horses and quantified rhythmic differences in temporal structure three natural gaits: walk, trot, canter. Our analyses show that each gait displays a strikingly specific pattern all are organized according to small‐integer ratios, those found when adjacent intervals related by mathematically simple relationship integer numbers. Walk trot exhibit an isochronous (1:1)—similar ticking clock—while canter is characterized ratios (1:1, 1:2, 2:1). While walk both isochrony, has slower tempo more precise accurate, like metronome. results quantitatively discriminate horse based on rhythm, revealing striking commonalities with human music some communicative signals. Gait vocal rhythmicity share key features, former likely predates latter; suggest supports gait‐based hypotheses for evolution rhythm. Specifically, perception locomotor may have evolved different species under pressure predator recognition mate selection; it been later exapted communication.

Язык: Английский

Процитировано

2