A5010340133- Animal Vocal Communication and Behavior
- Primate Behavior and Ecology
- Animal Behavior and Reproduction
- Language and cultural evolution
- Child and Animal Learning Development
- Multisensory perception and integration
- Music and Audio Processing
- Olfactory and Sensory Function Studies
- Evolutionary Game Theory and Cooperation
- Color perception and design
- Marine animal studies overview
- Speech and Audio Processing
- Wildlife Ecology and Conservation
- Evolutionary Psychology and Human Behavior
- Natural Language Processing Techniques
- Behavioral and Psychological Studies
- Face Recognition and Perception
- Language Development and Disorders
- Autism Spectrum Disorder Research
- Infant Health and Development
- Hemispheric Asymmetry in Neuroscience
- Animal Behavior and Welfare Studies
- Vascular Tumors and Angiosarcomas
- Science Education and Perceptions
- Vehicle Noise and Vibration Control
Niigata University
2025
The University of Tokyo
2023-2024
Tokyo University of the Arts
2023-2024
Evolutionary Genomics (United States)
2024
Kyoto University
2014-2023
Tottori University
2022
Institute of Primate Research
2009-2021
Inuyama Chuo Hospital
2010
Human speech production obeys the same acoustic principles as vocal in other animals but has distinctive features: A stable source is filtered by rapidly changing formant frequencies. To understand evolution, we examined a wide range of primates, combining observations phonation with mathematical modeling. We found that stability relies upon simplifications laryngeal anatomy, specifically loss air sacs and membranes. conclude evolutionary membranes allows human to mostly avoid spontaneous...
Mother-infant vocal interactions play a crucial role in the development of human language. However, comparatively little is known about maternal during nonhuman primates. Here, we report first evidence mother-daughter contributing to gibbons, singing and monogamous ape species. Gibbons are well for their species-specific duets sung between mates, yet intergenerational gibbon song development. We observed free-ranging mothers sub-adult daughters prior emigration. Daughters sang simultaneously...
Humans quickly detect the presence of evolutionary threats through visual perception. Many theorists have considered humans to be predisposed respond both snakes and spiders as evolutionarily fear-relevant stimuli. Evidence supports that human adults, children, snake-naive monkeys all pictures among flowers more than vice versa, but recent neurophysiological behavioral studies suggest may, in fact, processed similarly nonthreat animals. The evidence quick detection rapid fear learning by...
Abstract Diversifications in primate vocalization, including human speech, are believed to reflect evolutionary modifications vocal anatomy and physiology. Gibbon song is acoustically unique, comprising loud, melodious, penetrating pure tone‐like calls. In a white‐handed gibbon, Hylobates lar , the fundamental frequency ( f 0 ) of sounds amplified distinctively from higher harmonics normal air. helium‐enriched atmosphere, does not shift, but it significantly suppressed 2 emphasized. This...
The potentiality to find precursors of human language in nonhuman primates is questioned because differences related the genetic determinism and primate acoustic structures. Limiting debate production plasticity might have led underestimating parallels between primates. Adult-young concerning vocal usage been reported various species. A key feature ability converse, respecting turn-taking rules. Turn-taking structures some primates' adult exchanges, but development cognitive relevancy this...
In recent years, deep learning has achieved high performance in bioacoustic classification tasks by leveraging automatically processed acoustic features for large datasets. However, few evaluations of have been conducted on small-scale data because requires To test whether mel spectrograms (an features) are effective classifying relatively small data, we evaluated the two machines (random forest and support vector machine) using mel-spectrograms 651 coo calls six wild female Japanese...
A major function of contact calls in nonhuman primates is to maintain spatial cohesion among individuals a group. The risks spatial/visual separation from the group are likely affect auditory behavior, particular by increasing call rate. We tested whether risk influences coo emission investigating variation rate behavioral contexts two wild populations Japanese macaques (Macaca fuscata). focused on caller activity and degree visibility within habitat as primary potential factors mediating...
Abstract We examined acoustic individuality in wild agile gibbon Hylobates agilis and determined the variables that contribute to individual discrimination using multivariate analyses. recorded 125 female‐specific songs (great calls) from six groups west Sumatra measured 58 for each great call. performed principal component analysis summarize into components (PCs). Generally, PC corresponded a part of Significant differences were found across gibbons PCs. Moreover, strong was introductory...
Abstract This study investigated the extent to which vocal production in wild Japanese macaques, Macaca fuscata yakui, is flexible. macaques frequently exchange coo calls with other group members maintain auditory contact. When a call emitted but no respond within short interval, same monkey often emits another repeatedly. focused on these two successive sequences. First, sequences of eleven females free-ranging were recorded and analyzed. Comparisons acoustic properties between initial...
Volitional control of vocal production is an essential ability for usage learning in animal calls. Operant conditioning one the most direct experimental approaches assessing volitional animals. In this case study, we attempted operant vocalizations immature female white-handed gibbon ( Hylobates lar ). For production, was required to immediately vocalize response a V-sign cue by human experimenter's hand. During 2-month period intensive training conditioning, successfully learned produce...
Despite not knowing the exact age of individuals, humans can estimate their rough using age-related physical features. Nonhuman primates show some features; however, cognitive traits underlying recognition class have been revealed. Here, we tested ability two species Old World monkey, Japanese macaques (JM) and Campbell's monkeys (CM), to spontaneously discriminate classes visual paired comparison (VPC) tasks based on distinct categories infant adult images. First, VPCs were conducted in JM...
The central position and universality of music in human societies raises the question its phylogenetic origin. One most important properties involves harmonic musical intervals, response to which humans show a spontaneous preference for consonant over dissonant sounds starting from early infancy. Comparative studies conducted with organisms at different levels primate lineage are needed understand evolutionary scenario under this phenomenon emerged. Although previous research found no...
Multidimensional approaches support audiovisually coevolved large noses on the unique society of proboscis monkeys.
Reciprocity and cooperation are fundamental to human society observed in nonhuman primates. Primates not only sensitive direct reciprocity its violation but also indirect reciprocity. Recent studies demonstrated that some primate species adjusted their behavior by observing others' interactions. Capuchin, marmoset, squirrel monkeys avoided taking food from actors who behaved nonreciprocally; however, no such empirical evidence among Old World is available. Here, we show common marmosets,...
Abstract Objectives Speech is unique to humans and characterized by facial actions of ∼5 Hz oscillations lip, mouth or jaw movements. Lip‐smacking, a display primates oscillatory involving the vertical opening closing lips, exhibits stable 5‐Hz oscillation patterns, matching that speech, suggesting lip‐smacking precursor speech. We tested if vocal exhibiting same rate are found in wide forms displays various social contexts, diversity among species. Materials Methods observed wild...
The population-level use of tools has been reported in various animals. Nonetheless, how tool might spread throughout a population is still an open question. In order to answer that, we observed the behavior inserting human hair or human-hair-like material between their teeth as if they were using dental floss group long-tailed macaques (Macaca fascicularis) Thailand. observation was undertaken by video-recording tool-use 7 adult females who rearing 1-year-old infants, focal-animal-sampling...
Context dependency is a key feature in sequential structures of human language, which requires reference between words far apart the produced sequence. Assessing how long past context has an effect on current status provides crucial information to understand mechanism for complex behaviors. Birdsongs serve as representative model studying signals by non-human animals, while previous reports were upper-bounded methodological limitations. Here, we newly estimated birdsongs more scalable way...