Nepotistic patterns of violent psychopathy: evidence for adaptation?

dc.contributor.authorKrupp, Daniel Brian
dc.contributor.authorSewall, Lindsay A.
dc.contributor.authorLalumière, Martin L.
dc.contributor.authorSheriff, Craig
dc.contributor.authorHarris, Grant T.
dc.descriptionSherpa Romeo green journal: open accessen_US
dc.description.abstractPsychopaths routinely disregard social norms by engaging in selfish, antisocial, often violent behavior. Commonly characterized as mentally disordered, recent evidence suggests that psychopaths are executing a well-functioning, if unscrupulous strategy that historically increased reproductive success at the expense of others. Natural selection ought to have favored strategies that spared close kin from harm, however, because actions affecting the fitness of genetic relatives contribute to an individual’s inclusive fitness. Conversely, there is evidence that mental disorders can disrupt psychological mechanisms designed to protect relatives. Thus, mental disorder and adaptation accounts of psychopathy generate opposing hypotheses: psychopathy should be associated with an increase in the victimization of kin in the former account but not in the latter. Contrary to the mental disorder hypothesis,we showhere in a sample of 289 violent offenders that variation in psychopathy predicts a decrease in the genetic relatedness of victims to offenders; that is, psychopathy predicts an increased likelihood of harming non-relatives. Because nepotistic inhibition in violence may be caused by dispersal or kin discrimination, we examined the effects of psychopathy on (1) the dispersal of offenders and their kin and (2) sexual assault frequency (as a window on kin discrimination). Although psychopathy was negatively associated with coresidence with kin and positively associated with the commission of sexual assault, it remained negatively associated with the genetic relatedness of victims to offenders after removing cases of offenders who had coresided with kin and cases of sexual assault from the analyses.These results stand in contrast to models positing psychopathy as a pathology, and provide support for the hypothesis that psychopathy reflects an evolutionary strategy largely favoring the exploitation of non-relatives.en_US
dc.identifier.citationKrupp, D. B., Sewall, L. A., Lalumière, M. L., Sheriff, C., & Harris, G. T. (2012). Nepotistic patterns of violent psychopathy: evidence for adaptation? Frontiers in Psychology, 3(305). doi:10.3389/fpsyg.2012.00305en_US
dc.publisherFrontiers Research Foundationen_US
dc.publisher.departmentDepartment of Neuroscienceen_US
dc.publisher.facultyArts and Scienceen_US
dc.publisher.institutionQueen's Universityen_US
dc.publisher.institutionMcMaster Universityen_US
dc.publisher.institutionUniversity of Lethbridgeen_US
dc.publisher.institutionUniversity of Saskatchewanen_US
dc.publisher.institutionTulloch Mapping Solutionsen_US
dc.publisher.institutionMental Health Centreen_US
dc.subjectKin discriminationen_US
dc.subjectMental disorderen_US
dc.subjectSexual assaulten_US
dc.subjectKin recognitionen_US
dc.subjectMental illnessen_US
dc.subjectPsychology, Pathologicalen_US
dc.titleNepotistic patterns of violent psychopathy: evidence for adaptation?en_US
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