2,438 results match your criteria capuchin

How tufted capuchin monkeys (Sapajus spp.) and humans (Homo sapiens) handle a jointed tool.

J Comp Psychol 2021 Aug;135(3):382-393

Department of Psychology, University of Georgia.

The embodied theory of tooling predicts that when using a grasped object as a tool, individuals accommodate their actions to manage the altered degrees of freedom in the body-plus-object system. We tested predictions from this theory by studying how 3 tufted capuchin monkeys (Sapajus spp.) and 6 humans (Homo sapiens) used a hoe to retrieve a token. Read More

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Initial experimental experience of triple-knockout pig red blood cells as potential sources for transfusion in alloimmunized patients with sickle cell disease.

Transfusion 2021 Sep 22. Epub 2021 Sep 22.

Xenotransplantation Program, Department of Surgery, University of Alabama at Birmingham, Birmingham, Alabama, USA.

Background: Blood transfusion remains important in the treatment of patients with sickle cell disease (SCD). However, alloimmunization after blood transfusion is associated with patient morbidity and mortality. Triple-knockout (TKO) pigs (i. Read More

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September 2021

Planning actions with a magnetic tool: how initial tool orientation and number of functional ends influence motor planning abilities in capuchin monkeys (Sapajus spp.).

Anim Cogn 2021 Aug 28. Epub 2021 Aug 28.

Institute of Cognitive Sciences and Technologies, National Research Council, Via Ulisse Aldrovandi 16/B, 00197, Rome, Italy.

The way in which animals grasp objects to perform subsequent action execution allows studying their anticipatory abilities. We examined whether 11 capuchin monkeys (Sapajus spp.) were able to prospectively grasp a magnetic dowel to use it as a tool to retrieve a baited metallic container from a plexiglas box placed in front of them. Read More

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Molecular characterisation of parvorder Platyrrhini IgG sub-classes.

Mol Immunol 2021 Aug 25;139:23-31. Epub 2021 Aug 25.

Molecular Biology and Immunology Department, Fundación Instituto de Inmunología de Colombia (FIDIC), Carrera 50 No. 26-20, Bogotá D.C. 111321, Colombia; Health Sciences Division, Main Campus, Universidad Santo Tomás, Carrera 9#51-11, Bogotá D.C. 110231, Colombia; Microbiology Department, Faculty of Medicine, Universidad Nacional de Colombia, Carrera 45#26-85, Bogotá D.C. 111321, Colombia. Electronic address:

Non-human primates (NHP) are essential in modern biomedical research; New World monkeys (NWM) are mainly used as an experimental model regarding human malaria as they provide useful information about the parasite's biology and an induced immune response. It is known that a vaccine candidate's efficacy is mediated by a protection-inducing antibody response (IgG). Not enough information is available concerning IgG subclasses' molecular characteristics regarding NHP from parvorder Platyrrhini. Read More

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The effects of positive and negative experiences on subsequent behavior and cognitive performance in capuchin monkeys (Sapajus [Cebus] apella).

J Comp Psychol 2021 Aug 26. Epub 2021 Aug 26.

Language Research Center.

Our understanding of animals' affective processing is notably limited compared to the wealth of research on humans, largely due to difficulties in measurement. Moreover, despite a recent increase in the understanding of the interaction between affect and cognition in animals, most research has focused on negative affect, with the result that we continue to know little about the effects of positive affect. In this study, we tested 15 adult capuchin monkeys ( [] ) using a novel methodology that took advantage of capuchins' species-typical behavior to engineer both a positive and negative experience, using the same apparatus to minimize extraneous impacts. Read More

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Anything for a cheerio: Brown capuchins (Sapajus [Cebus] apella) consistently coordinate in an Assurance Game for unequal payoffs.

Am J Primatol 2021 Oct 26;83(10):e23321. Epub 2021 Aug 26.

Departments of Psychology, Philosophy & Neuroscience, Language Research Center, Georgia State University, Atlanta, Georgia, USA.

Unequal outcomes disrupt cooperation in some situations, but this has not been tested in the context of coordination in economic games. To explore this, we tested brown capuchins (Sapajus [Cebus] apella) on a manual version of the Stag Hunt (or Assurance) Game, in which individuals sequentially chose between two options, Stag or Hare, and were rewarded according to their choices and that of their partner. Typically, coordination on Stag results in an equal highest payout, whereas coordinating on Hare results in a guaranteed equal but lower payoff and uncoordinated play results in the lowest payoff when playing Stag. Read More

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October 2021

Major histocompatibility complex class II DR and DQ evolution and variation in wild capuchin monkey species (Cebinae).

PLoS One 2021 12;16(8):e0254604. Epub 2021 Aug 12.

Institute for Society and Genetics, University of California, Los Angeles, CA, United States of America.

The major histocompatibility complex (MHC) is an important gene complex contributing to adaptive immunity. Studies of platyrrhine MHC have focused on identifying experimental models of immune system function in the equivalent Human Leukocyte Antigen (HLA). These genes have thus been explored primarily in captive platyrrhine individuals from research colonies. Read More

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Individualized Target Training Facilitated Transfer of Group Housed Capuchin Monkeys ) to Test Cubicles and Discrimination of Targets on Computer Touch Screens.

Animals (Basel) 2021 Jul 12;11(7). Epub 2021 Jul 12.

Biological Foundations of Behavior Program, Franklin & Marshall College, Lancaster, PA 17604, USA.

Animals in captivity often experience fear, anxiety and aggression during non-voluntary procedures, leading to adverse behaviors and ineffective outcomes for both animals and caretakers. Negative reinforcement and punishment, often due to ignorance regarding animal learning, can hurt animal welfare. However, voluntary participation through positive reinforcement training (PRT) can decrease stress related to these procedures and increase desired behaviors. Read More

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The Vocal Repertoire of the Bearded Capuchin (Cebidae: Sapajus libidinosus): Implications for Understanding the Complexity of Neotropical Primate Communication.

Folia Primatol (Basel) 2021 23;92(3):151-163. Epub 2021 Jul 23.

Department of Zoology, Universidade de Brasília, Brasília, Brazil.

Vocal communication is an essential aspect of primate social behaviour. The bearded capuchin Sapajus libidinosus is endemic to Brazil, and some studies have described specific vocalisation types for this species; however, there is still no complete description of its vocal repertoire. Thus, this study aimed to describe the vocal repertoire of a group of S. Read More

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What happened? Do preschool children and capuchin monkeys spontaneously use visual traces to locate a reward?

Proc Biol Sci 2021 08 4;288(1956):20211101. Epub 2021 Aug 4.

School of Psychology and Neuroscience, University of St Andrews, St Andrews, UK.

The ability to infer unseen causes from evidence is argued to emerge early in development and to be uniquely human. We explored whether preschoolers and capuchin monkeys could locate a reward based on the physical traces left following a hidden event. Preschoolers and capuchin monkeys were presented with two cups covered with foil. Read More

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Urban capuchin monkeys Sapajus nigritus (Goldfuss, 1809) (Primates, Cebidae) as environmental bioindicators of leishmaniasis.

Transbound Emerg Dis 2021 Jul 29. Epub 2021 Jul 29.

Universidade Paranaense (UNIPAR), Umuarama, Paraná, Brasil.

The aim of this study was to investigate the presence of Leishmania sp. DNA and anti-Leishmania spp. antibodies in free-ranging Sapajus nigritus from an urban forest located in a city in the North Central region of the state of Paraná. Read More

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Social network changes during the development of immature capuchin monkeys (Sapajus spp.).

Primates 2021 Sep 17;62(5):801-815. Epub 2021 Jul 17.

Department of Physiology and Behavior, Psychobiology Post-Graduation Program, Federal University of Rio Grande Do Norte, Senador Salgado Filho Av., 3000, Natal, Rio Grande Do Norte, 59078-970, Brazil.

Immature indivuduals influence the formation and maintenance of social relationships within groups in diverse ways. Because of the increased interest of group members toward newborns, lactating females may use infants as social tools to temporally gain rank positions in matrilineal societies, and differential support received by the mothers may bias the network of immatures born to females of different ranks. In this study, we investigated the changes in proximity, grooming, play, and agonism networks of lactating females and immatures of different developmental periods, sex, and mothers' dominance rank. Read More

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September 2021

Genetic, Mammalian Hosts, and Geographical Diversity from Five Brazilian Biomes.

Pathogens 2021 Jun 11;10(6). Epub 2021 Jun 11.

Laboratório de Biologia de Tripanosomatídeos, Instituto Oswaldo Cruz, Fiocruz, Rio de Janeiro 21040-360, Brazil.

is a generalist hemoflagellate that infects mammals and is transmitted by triatomines around Latin America. Due to its high genetic diversity, it can be classified into two to five lineages. In Brazil, its distribution outside the Amazon region is virtually unknown, and knowledge on the ecology of its lineages and on host species diversity requires further investigation. Read More

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Costs of male infanticide for female capuchins: When does an adaptive male reproductive strategy become costly for females and detrimental to population viability?

Am J Phys Anthropol 2021 Jul 1. Epub 2021 Jul 1.

Department of Anthropology, Tulane University, New Orleans, Louisiana, USA.

Objectives: Infanticide in white-faced capuchins (Cebus capucinus imitator) typically occurs in association with alpha male replacements (AMRs). Although infanticide is likely adaptive for males, it imposes costs on females that are difficult to quantify without long-term demographic data. Here we investigate effects of AMRs and infanticide on female reproductive success and how these costs affect capuchin groups. Read More

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Black capuchin monkeys dynamically adjust group spread throughout the day.

Primates 2021 Sep 27;62(5):789-799. Epub 2021 Jun 27.

Department of Experimental Psychology, Institute of Psychology, University of São Paulo, São Paulo, Brazil.

Variation in group spread can affect communication between individuals, synchrony of activity and collective decision-making. Most studies have measured this variation in large time scales, but the variables that influence group spread change as the social unit ranges over different areas throughout the day. Thus, our aim was to analyze the diurnal variation in group spread of a group of black capuchin monkeys (Sapajus nigritus) inhabiting an area within the southeastern Brazilian Atlantic Forest, the Carlos Botelho State Park. Read More

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September 2021

Effects of dominance and female presence on secondary sexual characteristics in male tufted capuchin monkeys ().

Ecol Evol 2021 Jun 30;11(11):6315-6325. Epub 2021 Mar 30.

Yerkes National Primate Research Center Field Station Lawrenceville GA USA.

Alpha status may lead to physiological changes that enhance secondary sexual characteristics, which may serve as competitive signals to conspecific males, sexual signals to females, or possibly a combination of both. Here, we report measurements of secondary sexual characteristics in captive dominant and subordinate male tufted capuchin monkeys () with varying access to females. An adult male (who had previously been subordinate while housed with other males) was paired with an adult female. Read More

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Intra and inter-monkey transmission of bacteria in wild black capuchins monkeys (Sapajus nigritus): a preliminary study.

Braz J Biol 2021;82:e237460. Epub 2021 Jun 11.

Universidade Federal do Rio Grande do Sul - UFRGS, Programa de Pós-graduação em Microbiologia Agrícola e do Ambiente, Porto Alegre, RS, Brasil.

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The Perception of the Müller-Lyer Visual Illusion in Schizophrenics and Non-human Primates: A Translational Approach.

Front Behav Neurosci 2021 28;15:641776. Epub 2021 May 28.

Primate Center, Institute of Biology, University of Brasília, Brasilia, Brazil.

The Müller-Lyer Illusion (MLI) has been suggested as a potential marker for the perceptual impairments observed in schizophrenia patients. Along with some positive symptoms, these deficits are not easily modeled in rodent experiments, and novel animal models are warranted. Previously, MK-801 was shown to reduce susceptibility to MLI in monkeys, raising the prospects of an effective perception-based model. Read More

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Alternative Animal Models of Aging Research.

Front Mol Biosci 2021 17;8:660959. Epub 2021 May 17.

Computational Biology Group, Leibniz Institute on Aging - Fritz Lipmann Institute, Jena, Germany.

Most research on mechanisms of aging is being conducted in a very limited number of classical model species, i.e., laboratory mouse (), rat (), the common fruit fly () and roundworm (). Read More

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Evaluation of anaesthetic depth and cardiopulmonary effects of propofol infusion rate in Sapajus apella previously chemically contained with dextroketamine-midazolam.

J Med Primatol 2021 Aug 27;50(4):207-211. Epub 2021 May 27.

Veterinary, CETAS - Ibama, Seropédica, Brazil.

Background: This study evaluated the cardiopulmonary effects and anaesthetic depth induced by a propofol infusion rate of 0.8 mg/kg/min in monkeys (Sapajus apella).

Materials And Methods: Five capuchin monkeys received dextroketamine-midazolam intramuscularly. Read More

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On experimental tests for studying altruism in capuchin monkeys.

Behav Processes 2021 Aug 17;189:104424. Epub 2021 May 17.

Department of Psychology, Graduate School of Letters, Kyoto University, Kyoto, 606-8501, Japan.

Altruism is often considered as the ultimate form of prosociality and is defined as any act that benefits others without direct benefit to the actor. Many nonhuman species have been reported to express different forms of altruism, although their expression in experimental studies is highly dependent on the paradigm used. Tufted capuchin monkeys are one of the most studied species; however, the evidence for altruism in this species remains inconclusive. Read More

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Wild robust capuchin monkey interactions with sympatric primates.

Primates 2021 Jul 4;62(4):659-666. Epub 2021 May 4.

Neotropical Primates Research Group, São Paulo, Brazil.

Examining interactions among sympatric primate species can provide interesting information about competition, cooperation, and avoidance between those species. Those interactions can be neutral, positive, or negative for the species involved. Capuchin monkeys are medium-sized primates that can encounter both larger and smaller primates in their varied habitats. Read More

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Female emancipation in a male dominant, sexually dimorphic primate under natural conditions.

PLoS One 2021 19;16(4):e0249039. Epub 2021 Apr 19.

Theoretical Research in Evolutionary Life Sciences, TRÊS, Groningen Institute for Evolutionary Life Sciences, University of Groningen, Groningen, Netherlands.

In most group-living animals, a dominance hierarchy reduces the costs of competition for limited resources. Dominance ranks may reflect prior attributes, such as body size, related to fighting ability or reflect the history of self-reinforcing effects of winning and losing a conflict (the winner-loser effect), or both. As to prior attributes, in sexually dimorphic species, where males are larger than females, males are assumed to be dominant over females. Read More

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September 2021

Assessment of genetic variability in captive capuchin monkeys (Primates: Cebidae).

Sci Rep 2021 03 31;11(1):7306. Epub 2021 Mar 31.

Grupo de Investigación en Biología Evolutiva (GIBE), Departamento de Ecología, Genética y Evolución (DEGE), Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Intendente Güiraldes 2160, C.A.B.A., C1428EGA, Buenos Aires, Argentina.

Capuchin monkeys (genera Cebus and Sapajus) show a wide range distribution, from Honduras to Argentina. The aim of this work was to evaluate the genetic and phenotypic variability of captive specimens putatively belonging to S. cay (SCY) and S. Read More

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Bearded capuchin (Sapajus libidinosus) predation on a rock cavy (Kerodon rupestris) followed by prey sharing.

Primates 2021 May 27;62(3):463-466. Epub 2021 Mar 27.

Programa de Pós-Graduação em Biologia Animal, Departamento de Zoologia, Centro de Biociências, Laboratório de Ecologia Comportamento e Conservação (LECC), Universidade Federal de Pernambuco, Av. Prof. Moraes Rego, 1235, Cidade Universitária, Recife, Pernambuco, 50670-420, Brazil.

We describe predation on an adult rodent rock cavy and sharing of the carcass by a group of male bearded capuchins. Despite many studies, such an interaction has never been observed in bearded capuchins. Rock cavies are large rodents weighing around 25% of the weight of an adult male bearded capuchin. Read More

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The role of hunting on Sapajus xanthosternos' landscape of fear in the Atlantic Forest, Brazil.

Am J Primatol 2021 05 23;83(5):e23243. Epub 2021 Mar 23.

Institute of Psychology, Department of Experimental Psychology, University of São Paulo, São Paulo, São Paulo, Brazil.

Habitats with spatial variation in food availability, predation risk, and hunting pressure allow us to study how animals resolve the trade-off between food searching and predator avoidance. We investigated the influence of food availability, predation risk, and the perceived predation risk on habitat use by a primate living under high hunting pressure, the yellow-breasted capuchin monkeys, Sapajus xanthosternos, at Una Biological Reserve (ReBio Una). We hypothesized that the hunting pressure occurring in the capuchins' home range would favor predator avoidance to the detriment of searching for food. Read More

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Corpus callosum morphology across the lifespan in baboons (Papio anubis): A cross-sectional study of relative mid-sagittal surface area and thickness.

Neurosci Res 2021 Oct 17;171:19-26. Epub 2021 Mar 17.

Laboratoire de Psychologie Cognitive UMR7290, Aix-Marseille Univ, CNRS, Institute of Language, Communication and the Brain, France; Station de Primatologie-Celphedia, CNRS UAR846, Rousset, France.

The corpus callosum enables integration and coordination of cognitive processing between the cerebral hemispheres. In the aging human brain, these functions are affected by progressive axon and myelin deteriorations, reflected as atrophy of the midsagittal corpus callosum in old age. In non-human primates, these degenerative processes are less pronounced as previous morphometric studies on capuchin monkey, rhesus monkeys, and chimpanzees do not find old-age callosal atrophy. Read More

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October 2021

Same/different concept learning by primates and birds.

Learn Behav 2021 03 9;49(1):76-84. Epub 2021 Mar 9.

Department of Psychological Sciences, Auburn University, Auburn, AL, USA.

Same/different abstract-concept learning experiments were conducted with two primate species and three avian species by progressively increasing the size of the training stimulus set of distinctly different pictures from eight to 1,024 pictures. These same/different learning experiments were trained with two pictures presented simultaneously. Transfer tests of same and different learning employed interspersed trials of novel pictures to assess the level of correct performance on the very first time of subjects had seen those pictures. Read More

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Reproductive biology of owl (Aotus spp.) and capuchin (Sapajus spp.) monkeys.

Anim Reprod Sci 2021 Apr 28;227:106732. Epub 2021 Feb 28.

Postgraduate Program in Animal Health and Production in Amazonia, Animal Health and Production Institute, Federal Rural University of the Amazon, Av. Tancredo Neves, nº 251, Terra Firme, CEP: 66077-830, Belém, PA, Brazil. Electronic address:

Studies related to morpho-physiology improve the understanding of biological mechanisms in non-human primates (NHP), contributing to research in several areas, especially those of assisted reproduction and biomedicine. The genera Aotus and Sapajus are important considerations in conducting studies related to reproductive biology and biomedical research, where animals of these genera can serve as models for species with vulnerable conservation status. The reproductive functions of animals of these genera can be used in conducting studies with other NHP species, for which biological material is difficult to access. Read More

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