Primate Behavior and Ecology

An eye-tracking study of visual attention in chimpanzees and bonobos when viewing different tool-using techniques

This study uses eye-tracking to examine visual attention in chimpanzees and bonobos during tool-use demonstrations, finding attentional differences based on prior knowledge.

Chemical signatures of social information in Barbary macaques

The paper investigates how body odor in Barbary macaques encodes social information, finding individual signatures and limited kin or rank cues.

Conservation of southern yellow-cheeked gibbons (Nomascus gabriellae) in the Anthropocene

This study assesses the population viability of southern yellow-cheeked gibbons and suggests conservation strategies incorporating ecological and social aspects.

Anti-snake behavior and snake discrimination in vervet monkeys

This study examines anti-snake behavior and snake classification in vervet monkeys through observational and experimental methods, finding that inspection duration varies with snake species but not size, and alarm calling is proximity-dependent.

The baboon as a statistician: Can non-human primates perform linear regression on a graph?

This study tests if non-human primates can perform linear regression on graphs, finding baboons use statistical reasoning similar to humans.

Sex differences in pant-hoot vocalizations in wild Eastern chimpanzees

This study examines sex differences in pant-hoot vocalizations among wild Eastern chimpanzees, finding that females use pant-hoots less frequently and in response to others, while males show more varied patterns influenced by social and reproductive factors.

The development of social attention in orangutans: comparing peering behaviour in wild and zoo-housed individuals

This study compares peering behavior in wild and zoo-housed immature Sumatran orangutans, finding similar age-related patterns but differences in target selection and frequency.

Context-dependent Rhythmicity in Chimpanzee Displays

This study identifies isochronous rhythms in chimpanzee displays, suggesting shared rhythmic mechanisms between humans and non-human primates.

CalliCog: an open-source cognitive neuroscience toolkit for freely behaving nonhuman primates

CalliCog enables automated cognitive experiments in freely behaving marmosets, achieving touchscreen proficiency within two weeks and integrating with ECoG recordings.

Old age variably impacts chimpanzee engagement and efficiency in stone tool use

This study examines how aging affects nut-cracking behavior in wild chimpanzees, finding age-related declines in engagement and efficiency with individual variability.

ChimpanSEE, ChimpanDO: Grooming and play contagion in chimpanzees

This study investigates grooming and play contagion in chimpanzees, finding social closeness influences grooming contagion while age affects play contagion.

Monkeys engage in visual simulation to solve complex problems

This study shows monkeys can use visual simulation to solve complex problems, with neural patterns similar to humans.

Predictability of next elements in chimpanzee gesture sequences

This study examines chimpanzee gesture sequences to determine if they show non-random combinations and how predictability is influenced by combinatorial rules.

Improving reproductive success in captive marmosets through active female choice

This study improves breeding efficiency in captive marmosets by implementing a behavioral test allowing females to select mates, resulting in a 2.5-fold faster breeding success compared to random pairings.

Neurodevelopmental timing and socio-cognitive development in a prosocial cooperatively breeding primate (Callithrix jacchus)

This study examines neurodevelopmental timing in marmosets, linking brain development to social and behavioral milestones, and suggests implications for human social cognition.

Linking the evolution of two prefrontal brain regions to social and foraging challenges in primates

The paper examines the evolutionary factors influencing prefrontal brain regions in primates, finding that ecological constraints have a stronger impact on their size than social constraints.

Cross-species alignment along the chronological axis reveals evolutionary effect on structural development of human brain

The paper develops models to predict chronological age in human and macaque brains and identifies a cross-species age gap linked to behavioral performance.

Social Status as a Latent Variable in the Amygdala of Observers of Social Interactions

The paper shows that third-party observers infer social status from simulated dyadic interactions and that amygdala neurons encode the status of both interacting individuals.

Dance displays in gibbons: Biological and linguistic perspectives on structured, intentional and rhythmic body movement

This study analyzes dance displays in crested gibbons, revealing they are structured, intentional, and rhythmic visual communication used by sexually mature females in various contexts.

High early lactational synchrony within baboon groups predicts increased female-female competition and infant mortality

The paper examines how high early lactational synchrony in baboon groups affects female-female competition and infant mortality using long-term field data.

Flexible reproductive seasonality in Africa-dwelling papionins is associated with low environmental productivity and high climatic unpredictability

This study examines reproductive seasonality in Africa-dwelling papionins, finding that rainfall unpredictability, not rainfall seasonality, predicts the intensity of reproductive seasonality across populations.

High-throughput unsupervised quantification of patterns in the natural behavior of marmosets

This study quantifies natural marmoset behavior patterns using a multimodal dataset, showing day-to-day variability and social influences on behavior.

Brain Charts for the Rhesus Macaque Lifespan

This study creates normative brain growth charts for rhesus macaques across their lifespan using MRI data, revealing developmental milestones and cross-species comparisons with humans.

The Uniqueness of Human Vulnerability to Brain Aging in Great Ape Evolution

The paper compares age-related brain deterioration between humans and chimpanzees, finding a unique positive relationship between cerebral aging and cortical expansion in humans.

Common marmosets use body posture as multi-functional signal to solicit, maintain, and modify social play

This study shows common marmosets use body posture signals to regulate social play by increasing play probability, duration, diversity, and likelihood of play fighting.

When monkeys meet an ANYmal robot in the wild

This study examines interactions between wild vervet monkeys and a robot in a natural setting, finding differences in behavior based on social rank and age.

The ontogeny of chimpanzee technological efficiency

This study examines how social learning experiences during early development affect technological efficiency in wild chimpanzees, finding that more social learning opportunities and tolerance correlate with greater efficiency.

Choose your partner: Social evaluation of skilfulness at cooperative co-action tasks in Tonkean macaques (Macaca tonkeana)

This study shows Tonkean macaques do not prefer skilled partners in cooperative tasks, contradicting previous findings and suggesting limited social evaluation abilities.

Tool skill impacts the archaeological evidence across technological primates

The paper compares nut-cracking techniques and tool modification in chimpanzees, capuchins, and macaques to understand how tool skill affects archaeological evidence.

Meta-analyses reveal support for the Social Intelligence Hypothesis

The paper conducts meta-analyses of 103 studies to assess support for the Social Intelligence Hypothesis across different metrics, species, and testing conditions, finding consistent support.