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Hopkins WD, Mulholland M, Latzman RD. Characterizing the personality and gray matter volume of chimpanzees that exhibit autism-related socio-communicative phenotypes. PERSONALITY NEUROSCIENCE 2023; 6:e10. [PMID: 38107781 PMCID: PMC10725775 DOI: 10.1017/pen.2023.8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/07/2023] [Revised: 08/08/2023] [Accepted: 08/17/2023] [Indexed: 12/19/2023]
Abstract
Autism spectrum disorder (ASD) is a developmental disorder characterized by stereotypies or repetitive behaviors and impairments in social behavior and socio-communicative skills. One hallmark phenotype of ASD is poor joint attention skills compared to neurotypical controls. In addition, individuals with ASD have lower scores on several of the Big 5 personality dimensions, including Extraversion. Here, we examine these traits in a nonhuman primate model (chimpanzees; Pan troglodytes) to further understand the relationship between personality and joint attention skills, as well as the genetic and neural systems that contribute to these phenotypes. We used archival data including receptive joint attention (RJA) performance, personality based on caretaker ratings, and magnetic resonance images from 189 chimpanzees. We found that, like humans, chimpanzees who performed worse on the RJA task had lower Extraversion scores. We also found that joint attention skills and several personality dimensions, including Extraversion, were significantly heritable. There was also a borderline significant genetic correlation between RJA and Extraversion. A conjunction analysis examining gray matter volume showed that there were five main brain regions associated with both higher levels of Extraversion and social cognition. These regions included the right posterior middle and superior temporal gyrus, bilateral inferior frontal gyrus, left inferior frontal sulcus, and left superior frontal sulcus, all regions within the social brain network. Altogether, these findings provide further evidence that chimpanzees serve as an excellent model for understanding the mechanisms underlying social impairment related to ASD. Future research should further examine the relationship between social cognition, personality, genetics, and neuroanatomy and function in nonhuman primate models.
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Affiliation(s)
- William D. Hopkins
- The University of Texas MD Anderson Cancer Center, Bastrop, TX78602, USA
| | - Michele Mulholland
- The University of Texas MD Anderson Cancer Center, Bastrop, TX78602, USA
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2
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Weiss A, Feldblum JT, Altschul DM, Collins DA, Kamenya S, Mjungu D, Foerster S, Gilby IC, Wilson ML, Pusey AE. Personality traits, rank attainment, and siring success throughout the lives of male chimpanzees of Gombe National Park. PeerJ 2023; 11:e15083. [PMID: 37123001 PMCID: PMC10135409 DOI: 10.7717/peerj.15083] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2022] [Accepted: 02/25/2023] [Indexed: 05/02/2023] Open
Abstract
Personality traits in many taxa correlate with fitness. Several models have been developed to try to explain how variation in these traits is maintained. One model proposes that variation persists because it is linked to trade-offs between current and future adaptive benefits. Tests of this model's predictions, however, are scant in long-lived species. To test this model, we studied male chimpanzees living in Gombe National Park, Tanzania. We operationalized six personality traits using ratings on 19 items. We used 37 years of behavioral and genetic data to assemble (1) daily rank scores generated from submissive vocalizations and (2) records of male siring success. We tested whether the association between two personality traits, Dominance and Conscientiousness, and either rank or reproductive success, varied over the life course. Higher Dominance and lower Conscientiousness were associated with higher rank, but the size and direction of these relationships did not vary over the life course. In addition, independent of rank at the time of siring, higher Dominance and lower Conscientiousness were related to higher siring success. Again, the size and direction of these relationships did not vary over the life course. The trade-off model, therefore, may not hold in long-lived and/or slowly reproducing species. These findings also demonstrate that ratings are a valid way to measure animal personality; they are related to rank and reproductive success. These traits could therefore be used to test alternative models, including one that posits that personality variation is maintained by environmental heterogeneity, in studies of multiple chimpanzee communities.
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Affiliation(s)
- Alexander Weiss
- National Evolutionary Synthesis Center, Durham, NC, United States of America
- School of Philosophy, Psychology and Language Sciences, University of Edinburgh, Edinburgh, United Kingdom
- Wildlife Research Center, Kyoto University, Kyoto, Japan
- Scottish Primate Research Group, United Kingdom
| | - Joseph T. Feldblum
- Department of Anthropology, University of Michigan - Ann Arbor, Ann Arbor, MI, United States of America
- Society of Fellows, University of Michigan - Ann Arbor, Ann Arbor, MI, United States of America
- Department of Evolutionary Anthropology, Duke University, Durham, NC, United States of America
| | - Drew M. Altschul
- School of Philosophy, Psychology and Language Sciences, University of Edinburgh, Edinburgh, United Kingdom
- Scottish Primate Research Group, United Kingdom
- Mental Health Data Science, Edinburgh, United Kingdom
| | | | - Shadrack Kamenya
- Gombe Stream Research Centre, Jane Goodall Institute, Kigoma, Tanzania
| | - Deus Mjungu
- Gombe Stream Research Centre, Jane Goodall Institute, Kigoma, Tanzania
| | - Steffen Foerster
- Department of Evolutionary Anthropology, Duke University, Durham, NC, United States of America
| | - Ian C. Gilby
- School of Human Evolution and Social Change, Arizona State University, Tempe, AZ, United States of America
- Institute of Human Origins, Arizona State University, Tempe, AZ, United States of America
| | - Michael L. Wilson
- Department of Ecology, Evolution, and Behavior, University of Minnesota, St. Paul, MN, United States of America
- Institute on the Environment, University of Minnesota, St. Paul, MN, United States of America
| | - Anne E. Pusey
- Department of Evolutionary Anthropology, Duke University, Durham, NC, United States of America
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3
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The non-human perspective on the neurobiology of temperament, personality, and psychopathology: what’s next? Curr Opin Behav Sci 2022. [DOI: 10.1016/j.cobeha.2021.11.005] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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4
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Weiss A, Wilson VAD, Hopkins WD. Early social rearing, the V1A arginine vasopressin receptor genotype, and autistic traits in chimpanzees. Autism Res 2021; 14:1843-1853. [PMID: 34089305 DOI: 10.1002/aur.2550] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2020] [Revised: 05/18/2021] [Accepted: 05/22/2021] [Indexed: 01/04/2023]
Abstract
Previous studies found associations between autism-related phenotypes and both rearing and V1A arginine vasopressin receptor (AVPR1A) genotypes. We tested whether these exposures as well as their interaction were associated with autism-related phenotypes in 121 laboratory-housed chimpanzees. We used expert-derived weights to obtain autism scores from ratings on the 43-item Chimpanzee Personality Questionnaire; higher scores indicated more autistic-like traits. The first model included fixed effects for sex, age, and rearing, and a random effect that addressed the relatedness of subjects. The second model was the same except that it also included the rearing × AVPR1A genotype interaction as a fixed effect. Both models indicated that the phenotype was moderately heritable and that chimpanzees reared by their mothers had lower scores on the scale. The effect of genotype in both models indicated that chimpanzees with an indel deletion had higher scores on the scale, although the credible interval included zero. Moreover, the rearing × genotype interaction in the second model indicated that chimpanzees who possessed the non-deletion genotype and who were reared by their mother were at even greater risk. The credible interval for this effect did not include zero, but fit statistics indicated that the model without the interaction was marginally better, and the interaction was in the opposite direction than we expected based on previous work. These findings highlight the importance of rearing effects in the typical social development of our closet-living nonhuman relative. LAY SUMMARY: We tested whether, in chimpanzees, scores on a scale comprising traits that resembled aspects of autism were related to a gene associated with autism in prior research and/or early rearing. Human-reared chimpanzees had higher scores (indicating more autistic-like traits). Chimpanzees that possessed the gene also had higher scores, but we could not exclude the possibility that there was no effect of genotype. These findings suggest that we can measure autism-like characteristics in chimpanzees, and so study it in this species.
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Affiliation(s)
- Alexander Weiss
- Department of Psychology, School of Philosophy, Psychology and Language Sciences, The University of Edinburgh, Edinburgh, United Kingdom.,Wildlife Research Center, Kyoto University, Kyoto, Japan.,Scottish Primate Research Group, United Kingdom
| | - Vanessa A D Wilson
- Department of Comparative Cognition, Institute of Biology, University of Neuchatel, Neuchatel, Switzerland.,Distributional Linguistics Lab, Department of Comparative Language Science, University of Zurich, Zürich, Switzerland
| | - William D Hopkins
- Department of Comparative Medicine, The University of Texas M D Anderson Cancer Center, Bastrop, Texas, USA
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5
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Satchell LP, Kaaronen RO, Latzman RD. An ecological approach to personality: Psychological traits as drivers and consequences of active perception. SOCIAL AND PERSONALITY PSYCHOLOGY COMPASS 2021. [DOI: 10.1111/spc3.12595] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
| | - Roope Oskari Kaaronen
- Faculty of Social Sciences Helsinki Institute of Sustainability Science University of Helsinki Helsinki Finland
| | - Robert D. Latzman
- Department of Psychology Georgia State University Atlanta Georgia USA
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6
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Archer J. The reality and evolutionary significance of human psychological sex differences. Biol Rev Camb Philos Soc 2019; 94:1381-1415. [DOI: 10.1111/brv.12507] [Citation(s) in RCA: 36] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2017] [Revised: 02/14/2019] [Accepted: 02/21/2019] [Indexed: 01/03/2023]
Affiliation(s)
- John Archer
- Department of PsychologyUniversity of Central Lancashire Preston Lancashire PR1 2HE U.K
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7
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Developing individual differences in primate behavior: the role of genes, environment, and their interplay. Behav Ecol Sociobiol 2019. [DOI: 10.1007/s00265-019-2633-8] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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8
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Saucier G. Culture, morality and individual differences: comparability and incomparability across species. Philos Trans R Soc Lond B Biol Sci 2019; 373:rstb.2017.0170. [PMID: 29483353 DOI: 10.1098/rstb.2017.0170] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 12/11/2017] [Indexed: 11/12/2022] Open
Abstract
Major routes to identifying individual differences (in diverse species) include studies of behaviour patterns as represented in language and neurophysiology. But results from these approaches appear not to converge on some major dimensions. Identifying dimensions of human variation least applicable to non-human species may help to partition human-specific individual differences of recent evolutionary origin from those shared across species. Human culture includes learned, enforced social-norm systems that are symbolically reinforced and referenced in displays signalling adherence. At a key juncture in human evolution bullying aggression and deception-based cheating apparently became censured in the language of a moral community, enabling mutual observation coordinated in gossip, associated with external sanctions. That still-conserved cultural paradigm moralistically regulates selfish advantage-taking, with shared semantics and explicit rules. Ethics and moral codes remain critical and universal components of human culture and have a stronger imprint in language than most aspects of the currently popular Big-Five taxonomy, a model that sets out five major lines of individual-differences variation in human personality. In other species (e.g. chimpanzees), human observers might see apparent individual differences in morality-relevant traits, but not because the animals have human-analogue sanctioning systems. Removing the moral dimension of personality and other human-specific manifestations (e.g. religion) may aid in identifying those other bases of individual differences more ubiquitous across species.This article is part of the theme issue 'Diverse perspectives on diversity: multi-disciplinary approaches to taxonomies of individual differences'.
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Affiliation(s)
- Gerard Saucier
- Department of Psychology, University of Oregon, 1227 University of Oregon, Eugene, OR 97403, USA
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9
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Altschul DM, Hopkins WD, Herrelko ES, Inoue-Murayama M, Matsuzawa T, King JE, Ross SR, Weiss A. Personality links with lifespan in chimpanzees. eLife 2018; 7:e33781. [PMID: 30296994 PMCID: PMC6177254 DOI: 10.7554/elife.33781] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2017] [Accepted: 09/09/2018] [Indexed: 11/13/2022] Open
Abstract
Life history strategies for optimizing individual fitness fall on a spectrum between maximizing reproductive efforts and maintaining physical health over time. Strategies across this spectrum are viable and different suites of personality traits evolved to support these strategies. Using data from 538 captive chimpanzees (Pan troglodytes) we tested whether any of the dimensions of chimpanzee personality - agreeableness, conscientiousness, dominance, extraversion, neuroticism, and openness - were associated with longevity, an attribute of slow life history strategies that is especially important in primates given their relatively long lives. We found that higher agreeableness was related to longevity in males, with weaker evidence suggesting that higher openness is related to longer life in females. Our results link the literature on human and nonhuman primate survival and suggest that, for males, evolution has favored the protective effects of low aggression and high quality social bonds.
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Affiliation(s)
- Drew M Altschul
- Department of PsychologySchool of Philosophy, Psychology and Language Sciences, The University of EdinburghEdinburghUnited Kingdom
- Scottish Primate Research GroupUnited Kingdom
- Centre for Cognitive Ageing and Cognitive EpidemiologyEdinburghUnited Kingdom
| | - William D Hopkins
- Neuroscience InstituteGeorgia State UniversityAtlantaUnited States
- Division of Developmental and Cognitive NeurosciencesYerkes National Primate Research CenterAtlantaUnited States
| | - Elizabeth S Herrelko
- National Zoological Park, Smithsonian InstitutionWashingtonUnited States
- Psychology DivisionUniversity of StirlingStirlingUnited Kingdom
| | - Miho Inoue-Murayama
- Wildlife Research CenterKyoto UniversityKyotoJapan
- Wildlife Genome Collaborative Research GroupNational Institute for Environmental StudiesTsukubaJapan
| | - Tetsuro Matsuzawa
- Institute for Advanced Study, Kyoto UniversityKyotoJapan
- Primate Research InstituteKyoto UniversityInuyamaJapan
- Japan Monkey CentreInuyamaJapan
| | - James E King
- Department of PsychologyUniversity of ArizonaTucsonUnited States
| | - Stephen R Ross
- Lester E. Fisher Center for the Study and Conservation of ApesLincoln Park ZooChicagoUnited States
| | - Alexander Weiss
- Department of PsychologySchool of Philosophy, Psychology and Language Sciences, The University of EdinburghEdinburghUnited Kingdom
- Scottish Primate Research GroupUnited Kingdom
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10
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Common marmoset (Callithrix jacchus) personality, subjective well-being, hair cortisol level and AVPR1a, OPRM1, and DAT genotypes. Sci Rep 2018; 8:10255. [PMID: 29980755 PMCID: PMC6035208 DOI: 10.1038/s41598-018-28112-7] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2017] [Accepted: 06/04/2018] [Indexed: 11/08/2022] Open
Abstract
We studied personality, subjective well-being, and hair cortisol level, in common marmosets Callithrix jacchus, a small, cooperatively breeding New World monkey, by examining their associations with one another and genotypes. Subjects were 68 males and 9 females that lived in the RIKEN Center for Life Science Technologies. Personality and subjective well-being were assessed by keeper ratings on two questionnaires, hair samples were obtained to assay cortisol level and buccal swabs were used to assess AVPR1a, OPRM1 and DAT genotypes. Three personality domains-Dominance, Sociability, and Neuroticism-were identified. Consistent with findings in other species, Sociability and Neuroticism were related to higher and lower subjective well-being, respectively. Sociability was also associated with higher hair cortisol levels. The personality domains and hair cortisol levels were heritable and associated with genotypes: the short form of AVPR1a was associated with lower Neuroticism and the AA genotype of the A111T SNP of OPRM1 was related to lower Dominance, lower Neuroticism, and higher hair cortisol level. Some genetic associations were not in directions that one would expect given findings in other species. These findings provide insights into the proximate and ultimate bases of personality in common marmosets, other primates and humans.
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11
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Neuroanatomical Correlates of Hierarchical Personality Traits in Chimpanzees: Associations with Limbic Structures. PERSONALITY NEUROSCIENCE 2018; 1:e4. [PMID: 32435726 PMCID: PMC7219892 DOI: 10.1017/pen.2018.1] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Accepted: 01/27/2018] [Indexed: 12/30/2022]
Abstract
A converging literature has revealed the existence of a set of largely consistent, hierarchically organized personality traits, that is broader traits are able to be differentiated into more fine-grained traits, in both humans and chimpanzees. Despite recent work suggesting a neural basis to personality in chimpanzees, little is known with regard to the involvement of limbic structures (i.e., amygdala and hippocampus), which are thought to play important roles in emotion. Using saved maximum likelihood estimated exploratory factor scores (two to five factors) in the context of a series of path analyses, the current study examined associations among personality dimensions across various levels of the personality hierarchy and individual variability of amygdala and hippocampal grey matter (GM) volume in a sample of captive chimpanzees (N=191). Whereas results revealed no association between personality dimensions and amygdala volume, a more nuanced series of associations emerged between hippocampal GM volume and personality dimensions at various levels of the hierarchy. Hippocampal GM volume associated most notably with Alpha (a dimension reflecting a tendency to behave in an undercontrolled and agonistic way) at the most basic two-factor level of the hierarchy; associated positively with Disinhibition at the next level of the hierarchy (“Big Three”); and finally, associated positively with Impulsivity at the most fine-grained level (“five-factor model”) of the hierarchy. Findings underscore the importance of the hippocampus in the neurobiological foundation of personality, with support for its regulatory role of emotion. Further, results suggest the importance of the distinction between structure and function, particularly with regard to the amygdala.
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12
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Gartner MC, Weiss A. Studying primate personality in zoos: implications for the management, welfare and conservation of great apes. ACTA ACUST UNITED AC 2018. [DOI: 10.1111/izy.12187] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Affiliation(s)
- M. C. Gartner
- Philadelphia Zoo; 3400 West Girard Avenue Philadelphia Pennsylvania 19104 USA
| | - A. Weiss
- Department of Psychology; School of Philosophy, Psychology and Language Sciences; The University of Edinburgh; Edinburgh EH8 9JZ United Kingdom
- Scottish Primate Research Group; United Kingdom
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13
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Rogers J. The behavioral genetics of nonhuman primates: Status and prospects. AMERICAN JOURNAL OF PHYSICAL ANTHROPOLOGY 2018; 165 Suppl 65:23-36. [PMID: 29380886 DOI: 10.1002/ajpa.23384] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
The complexity and diversity of primate behavior have long attracted the attention of ethologists, psychologists, behavioral ecologists, and neuroscientists. Recent studies have advanced our understanding of the nature of genetic influences on differences in behavior among individuals within species. A number of analyses have focused on the genetic analysis of behavioral reactions to specific experimental tests, providing estimates of the degree of genetic control over reactivity, and beginning to identify the genes involved. Substantial progress is also being made in identifying genetic factors that influence the structure and function of the primate brain. Most of the published studies on these topics have examined either cercopithecines or chimpanzees, though a few studies have addressed these questions in other primate species. One potentially important line of research is beginning to identify the epigenetic processes that influence primate behavior, thus revealing specific cellular and molecular mechanisms by which environmental experiences can influence gene expression or gene function relevant to behavior. This review summarizes many of these studies of non-human primate behavioral genetics. The primary focus is on analyses that address the nature of the genes and genetic processes that affect differences in behavior among individuals within non-human primate species. Analyses of between species differences and potential avenues for future research are also discussed.
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Affiliation(s)
- Jeffrey Rogers
- Department of Molecular and Human Genetics and Human Genome Sequencing Center, Baylor College of Medicine, Houston, Texas 77030
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14
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Latzman RD, Schapiro SJ, Hopkins WD. Triarchic Psychopathy Dimensions in Chimpanzees ( Pan troglodytes): Investigating Associations with Genetic Variation in the Vasopressin Receptor 1A Gene. Front Neurosci 2017; 11:407. [PMID: 28769746 PMCID: PMC5511813 DOI: 10.3389/fnins.2017.00407] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2017] [Accepted: 06/30/2017] [Indexed: 11/16/2022] Open
Abstract
Vasopressin is a neuropeptide known to be associated with the development and evolution of complex socio-emotional behaviors including those relevant to psychopathic personality. In both humans and chimpanzees, recent research suggests a strong genetic contribution to individual variation in psychopathic traits. To date, however, little is known concerning specific genes that might explain the observed heritability of psychopathy. In a relatively large sample of captive chimpanzees (N = 164), the current study thus sought to investigate gene-environment associations between triarchic psychopathy dimensions (i.e., disinhibition, meanness, and boldness) and (1) early social rearing experiences and (2) polymorphisms in the promoter region of the V1A receptor gene (AVPR1A). Among chimpanzees raised by their biological conspecific mothers, AVPR1A was found to uniquely explain variability in disinhibition and in sex-specific ways for boldness and a total psychopathy score; however, in contrast, no significant associations were found between AVPR1A and any of the triarchic psychopathy dimensions in chimpanzees raised the first 3 years of life in a human nursery. Thus, when considered in its entirety, results suggest an important contributory influence of V1A receptor genotype variation in the explanation of the development of psychopathy under some but not all early rearing conditions. Results of the current study provide additional support for the assertion that psychopathic tendencies are rooted in basic, evolutionarily-meaningful dispositions, and provide support for a primate-translational operationalization of key neurobehavioral constructs relevant both to psychopathy and to broader forms of psychopathology.
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Affiliation(s)
- Robert D. Latzman
- Department of Psychology, Georgia State UniversityAtlanta, GA, United States
| | - Steven J. Schapiro
- Michael E. Keeling Center for Comparative Medicine and Research, University of Texas MD Anderson Cancer CenterBastrop, TX, United States
- Department of Experimental Medicine, University of CopenhagenCopenhagen, Denmark
| | - William D. Hopkins
- Neuroscience Institute, Georgia State UniversityAtlanta, GA, United States
- Division of Developmental and Cognitive Neurosciences, Yerkes National Primate Research CenterAtlanta, GA, United States
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15
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Latzman RD, Patrick CJ, Freeman HJ, Schapiro SJ, Hopkins WD. Etiology of Triarchic Psychopathy Dimensions in Chimpanzees ( Pan troglodytes). Clin Psychol Sci 2017; 5:341-354. [PMID: 28503367 PMCID: PMC5423660 DOI: 10.1177/2167702616676582] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
The current study undertook analyses of genealogical data from a sample of 178 socially-housed chimpanzees (Pan troglodytes) with well-documented pedigrees, to clarify the etiologic bases of triarchic psychopathy dimensions and the influence of early social rearing experiences. Whereas biometric analyses for the full sample indicated significant heritability for the boldness dimension of psychopathy only, heritability estimates varied by early rearing, with all three triarchic dimensions showing significant heritabilities among mother-reared but not nursery-reared apes. For mother-reared apes, both genes and environment contributed to covariance between meanness and disinhibition, whereas environment contributed mainly to covariation between these dimensions and boldness. Results indicate contributions of both genes and environment to psychopathic tendencies, with an important role for early-rearing in their relative contributions to distinct phenotypic subdimensions. In conjunction with findings from human studies, results provide valuable insights into core biobehavioral processes relevant to psychological illness and health.
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Affiliation(s)
| | | | - Hani J. Freeman
- Michael E. Keeling Center for Comparative Medicine and Research, The University of Texas MD Anderson Cancer Center
| | - Steven J. Schapiro
- Michael E. Keeling Center for Comparative Medicine and Research, The University of Texas MD Anderson Cancer Center
- Department of Experiment Medicine, University of Copenhagen
| | - William D. Hopkins
- Neuroscience Institute, Georgia State University
- Division of Developmental and Cognitive Neuroscience, Yerkes National Primate Research Center
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16
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Wilson VAD, Weiss A, Humle T, Morimura N, Udono T, Idani G, Matsuzawa T, Hirata S, Inoue-Murayama M. Chimpanzee Personality and the Arginine Vasopressin Receptor 1A Genotype. Behav Genet 2016; 47:215-226. [PMID: 27804047 PMCID: PMC5306277 DOI: 10.1007/s10519-016-9822-2] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2016] [Accepted: 09/29/2016] [Indexed: 12/05/2022]
Abstract
Polymorphisms of the arginine vasopressin receptor 1a (AVPR1a) gene have been linked to various measures related to human social behavior, including sibling conflict and agreeableness. In chimpanzees, AVPR1a polymorphisms have been associated with traits important for social interactions, including sociability, joint attention, dominance, conscientiousness, and hierarchical personality dimensions named low alpha/stability, disinhibition, and negative emotionality/low dominance. We examined associations between AVPR1a and six personality domains and hierarchical personality dimensions in 129 chimpanzees (Pan troglodytes) living in Japan or in a sanctuary in Guinea. We fit three linear and three animal models. The first model included genotype, the second included sex and genotype, and the third included genotype, sex, and sex × genotype. All personality phenotypes were heritable. Chimpanzees possessing the long form of the allele were higher in conscientiousness, but only in models that did not include the other predictors; however, additional analyses suggested that this may have been a consequence of study design. In animal models that included sex and sex × genotype, chimpanzees homozygous for the short form of the allele were higher in extraversion. Taken with the findings of previous studies of chimpanzees and humans, the findings related to conscientiousness suggest that AVPR1a may be related to lower levels of impulsive aggression. The direction of the association between AVPR1a genotype and extraversion ran counter to what one would expect if AVPR1a was related to social behaviors. These results help us further understand the genetic basis of personality in chimpanzees.
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Affiliation(s)
- V A D Wilson
- Department of Psychology, School of Philosophy, Psychology and Language Sciences, The University of Edinburgh, 7 George Square, Edinburgh, EH8 9JZ, UK.,Cognitive Ethology, German Primate Center, Georg-August-University Goettingen, Leibniz-ScienceCampus, Göttingen, Germany
| | - A Weiss
- Department of Psychology, School of Philosophy, Psychology and Language Sciences, The University of Edinburgh, 7 George Square, Edinburgh, EH8 9JZ, UK.
| | - T Humle
- Durrell Institute of Conservation and Ecology (DICE), School of Anthropology and Conservation, University of Kent, Canterbury, UK
| | - N Morimura
- Wildlife Research Center, Kyoto University, Kyoto, Japan
| | - T Udono
- Wildlife Research Center, Kyoto University, Kyoto, Japan
| | - G Idani
- Wildlife Research Center, Kyoto University, Kyoto, Japan
| | - T Matsuzawa
- Institute for Advanced Study, Kyoto University, Kyoto, Japan.,Primate Research Institute, Kyoto University, Inuyama, Japan.,Japan Monkey Centre, Inuyama, Japan
| | - S Hirata
- Wildlife Research Center, Kyoto University, Kyoto, Japan
| | - M Inoue-Murayama
- Wildlife Research Center, Kyoto University, Kyoto, Japan.,National Institute for Environmental Studies, Tsukuba, Japan
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17
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Latzman RD, Hopkins WD. Letter to the Editor: Avoiding a lost opportunity for psychological medicine: importance of chimpanzee research to the National Institutes of Health portfolio. Psychol Med 2016; 46:2445-2447. [PMID: 27283031 DOI: 10.1017/s0033291716000799] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- R D Latzman
- Department of Psychology,Georgia State University,Atlanta, GA,USA
| | - W D Hopkins
- Neuroscience Institute,Georgia State University,Atlanta, GA,USA
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Latzman RD, Sauvigné KC, Hopkins WD. Translating chimpanzee personality to humans: Investigating the transportability of chimpanzee-derived personality scales to humans. Am J Primatol 2015; 78:601-9. [DOI: 10.1002/ajp.22522] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2015] [Revised: 12/04/2015] [Accepted: 12/14/2015] [Indexed: 12/27/2022]
Affiliation(s)
| | | | - William D. Hopkins
- Neuroscience Institute; Georgia State University; Atlanta Georgia
- Division of Developmental and Cognitive Neuroscience; Yerkes National Primate Research Center; Atlanta Georgia
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Latzman RD, Hecht LK, Freeman HD, Schapiro SJ, Hopkins WD. Neuroanatomical correlates of personality in chimpanzees (Pan troglodytes): Associations between personality and frontal cortex. Neuroimage 2015; 123:63-71. [PMID: 26311604 DOI: 10.1016/j.neuroimage.2015.08.041] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2014] [Revised: 08/17/2015] [Accepted: 08/18/2015] [Indexed: 01/18/2023] Open
Abstract
Converging empirical data suggests that a set of largely consistent personality traits exist in both human and nonhuman primates; despite these similarities, almost nothing is known concerning the neurobiological basis of these traits in nonhuman primates. The current study examined associations between chimpanzee personality traits and the grey matter volume and asymmetry of various frontal cortex regions in 107 captive chimpanzees. Chimpanzees rated as higher on Openness and Extraversion had greater bilateral grey matter volumes in the anterior cingulate cortex. Further, chimpanzee rated as higher on Dominance had larger grey volumes in the left anterior cingulate cortex and right Prefrontal Cortex (PFC). Finally, apes rated higher on Reactivity/Unpredictability had higher grey matter volumes in the right mesial PFC. All associations survived after applying False Discovery Rate (FDR) thresholds. Results are discussed in terms of current neuroscientific models of personality which suggest that the frontal cortex, and asymmetries in this region, play an important role in the neurobiological foundation of broad dispositional traits.
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Affiliation(s)
| | - Lisa K Hecht
- Department of Psychology, Georgia State University, USA
| | - Hani D Freeman
- Michale E. Keeling Center for Comparative Medicine and Research, The University of Texas MD Anderson Cancer Center, USA
| | - Steven J Schapiro
- Michale E. Keeling Center for Comparative Medicine and Research, The University of Texas MD Anderson Cancer Center, USA; Department of Experimental Medicine, University of Copenhagen, Denmark
| | - William D Hopkins
- Neuroscience Institute, Georgia State University, USA; Division of Developmental and Cognitive Neuroscience, Yerkes National Primate Research Center, USA
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