Evolutionäre Herangehensweisen hatten in der Persönlichkeitspsychologie nicht den gleichen Erfolg wie in anderen Bereichen der Psychologie. In dieser Dissertation werden zwei alternative evolutionäre Herangehensweisen an die Persönlichkeitspsychologie diskutiert und angewendet. Die evolutionsgenetische Herangehensweise fragt, warum genetische Varianz in Persönlichkeitsunterschieden existiert. Im ersten Teil dieser Dissertation werden verschiedene evolutionsgenetische Mechanismen, die genetische Varianz erklären können, verglichen. Auf Grundlage evolutionsgenetischer Theorie und empirischen Befunden aus der Verhaltensgenetik und Persönlichkeitspsychologie wird geschlussfolgert, dass ein Mutations-Selektions-Gleichgewicht genetische Varianz in Intelligenz gut erklären kann, während ausgleichende Selektion durch Umweltheterogenität die plausibelste Erklärung für genetische Unterschiede in Persönlichkeitseigenschaften ist. Komplementär zur evolutionsgenetischen Herangehensweise beginnt die „Life History“-Herangehensweise damit, wie Menschen ihre Ressourcen in evolutionär relevante Lebensbereiche investieren. Im zweiten Teil der Dissertationsschrift wird diese Herangehensweise am Beispiel von Investitionsunterschieden in Langzeit- versus Kurzzeit-Paarungstaktiken (wie im Konstrukt der Soziosexualität abgebildet) erläutert. Zwei neue Maße zur Erfassung von Soziosexualitätskomponenten werden vorgestellt. Während das revidierte Soziosexuelle Orientierungsinventar (SOI-R) ein Fragebogen zur Erfassung der Facetten „Verhalten“, „Einstellung“ und „Begehren“ ist, wurde mit dem Single-Attribute Impliziten Assoziationstest (SA-IAT) eine neue Methode zur indirekten Erfassung impliziter Soziosexualität entwickelt. Beide Maße zeigten konkurrente Validität in Onlinestudien, aber nur der SOI-R erwies sich als prädiktiv für Paarungstaktiken, einschließlich beobachtetem Flirtverhalten sowie der Zahl der Sexualpartner und Veränderungen im Beziehungsstatus innerhalb der nächsten 12 Monate. / Evolutionary approaches have not been as successful in personality psychology as they were in other areas of psychology. In this thesis, two alternative evolutionary approaches to personality psychology are discussed and applied. The evolutionary genetic approach asks why genetic variance in personality differences exists. In the first part of this thesis, three evolutionary genetic mechanisms that could explain genetic variance in personality differences are assessed: selective neutrality, mutation-selection balance, and balancing selection. Based on evolutionary genetic theory and empirical results from behavior genetics and personality psychology, it is concluded that selective neutrality is largely irrelevant, that mutation-selection balance seems best at explaining genetic variance in intelligence, and that balancing selection by environmental heterogeneity seems best at explaining genetic variance in personality traits. Complementary to the evolutionary genetic approach, the life history approach starts with how people allocate their resources to evolutionarily relevant life tasks. In the second part of this thesis, differences in the allocation to long-term versus short-term mating tactics (as reflected in the construct of sociosexuality) are used as a case to exemplify this approach. Two new measures for the assessment of sociosexuality components are presented. While the revised Sociosexual Orientation Inventory (SOI-R) is a questionnaire that assesses the facets Behavior, Attitude and Desire, the sociosexuality Single-Attribute Implicit Association Test (SA-IAT) is a new methodic development aimed to assess implicit sociosexuality indirectly. Both measures showed concurrent validity in online studies, but only the SOI-R facets were predictive of mating tactics, including observed flirting behavior, as well as for the number of sexual partners and changes in romantic relationship status over the following 12 months.

La présente étude porte sur les aspects Nature-Culture relatifs à l’émergence de variations interindividuelles quant à la capacité universelle de régulation d’une émotion primaire, la tristesse. Cette problématique représente un exemple du lien entre la conception évolutionniste d’une nature humaine universelle, innée et génétiquement prescrite, mais susceptible de variation dans son expression en fonction d’expériences individuelles liées aux processus de socialisation et d’enculturation. À l’aide du devis génétiquement informatif des jumeaux, nous nous sommes d’abord penchés sur l’étiologie gènes-environnement de la dépression à l’enfance, une dysfonction du système de régulation émotionnelle de la tristesse. Puis, nous nous sommes interrogés quant à l’influence du traitement et de l’état psychique maternels sur cet aspect du développement émotionnel de l’enfant. Nos analyses de la symptomatologie dépressive indiquent une absence d’influence génétique dans le développement de ce trouble de l’humeur. Les variations individuelles de la régulation de la tristesse reposent ainsi uniquement sur les effets de l’environnement. Nos résultats révèlent également l’existence d’une relation importante entre l’état psychique de la mère, évalué lorsque les jumeaux avaient cinq mois, et la présence de symptômes dépressifs chez ces derniers mesurés huit ans plus tard. L’état psychique de la mère est considéré comme l’un des meilleurs indicateurs de la qualité du traitement maternel en bas âge. Nos mesures directes des comportements maternels envers le nourrisson et le développement ultérieur du trouble de dépression indiquent également l’existence de tendances statistiques allant dans le sens de notre hypothèse d’un traitement maternel sous-optimal contribuant au développement de dysfonctions émotionnelles ultérieures. / The present study explores the Nature-Nurture aspects pertaining to the emergence of interindividual variation in the emotional regulation of a primary emotion, sadness. This question is an example of the more encompassing issue of a universal human nature, biologically evolved and genetically underwritten, being nevertheless variable in its expression depending on individual experiences linked to socialization and enculturation. Using a genetically informative twin design, we explored the genetic-environmental aetiology of child depression, which is understood to be a dysfunction in the emotional regulation system of sadness. We then assessed the influences of maternal behavior and mental state on the development of children’s depressive symptoms. Our analysis of child depression shows an absence of genetic influence in the emergence of this mood disorder. Thus, individual variation in sadness regulation appears to be solely generated by environmental influences. Our results also show a strong and significant relation between maternal psychological state, assessed when the twins were 5 months of age, and children’s depressive symptoms measured 8 years later. Maternal psychological state is considered to be one of the most reliable indicators of the quality of maternal treatment in childhood. Our direct measures of maternal behavior toward the infant and the subsequent development of depressive disorder also point to statistical trends supporting our hypothesis of suboptimal maternal treatment contributing to the development of later emotional dysfunction.

Indiana University-Purdue University Indianapolis (IUPUI) / Abuse of alcohol during adolescence continues to be a problem, and it has been shown that earlier onset of drinking predicts increased alcohol abuse problems later in life. High levels of impulsivity have been demonstrated to be characteristic of alcoholics, and impulsivity has also been shown to predict later alcohol use in teenage subjects, showing that impulsivity may be an inherent underlying biological process that precedes the development of alcohol use disorders. These experiments examined adolescent drinking in a high-drinking, relatively impulsive mouse population, and assessed its effects on adult drinking and adult impulsivity. Experiment 1: Selectively bred High-Alcohol Preferring (HAP II) mice, which are shown to be highly impulsive, were given either alcohol (free choice access) or water only for two weeks during middle adolescence or adulthood. All mice were given free choice access to alcohol following 30 days without access, in adulthood. Experiment 2: Adolescent HAP II mice drank alcohol and water, or water alone, for two weeks, and were then trained to perform a delay discounting task as adults to measure impulsivity. In each experiment, effects of volitional ethanol consumption on later behavior were assessed. We expected adolescent alcohol exposure to increase subsequent drinking and impulsivity. Adolescent mice consumed significant quantities of ethanol, reaching average blood ethanol concentrations (BECs) of 142 mg/dl in Experiment 1 and 108 mg/dl in Experiment 2. Adult mice reached average BECs of 154 mg/dl in Experiment 2. Mice pre-exposed to alcohol in either adolescence or adulthood showed a transient increase in ethanol consumption, but we observed no differences in impulsivity in adult mice as a function of whether mice drank alcohol during adolescence. These findings indicate that HAP II mice drink intoxicating levels of alcohol during both adolescence and adulthood, and that this volitional intake has long-term effects on subsequent drinking behavior. Nonetheless, this profound exposure to alcohol during adolescence does not increase impulsivity in adulthood, indicating that long-term changes in drinking are mediated by mechanisms other than impulsivity. Importantly, this research demonstrates that the HAP II mouse is a good candidate for a model of heavy adolescent alcohol consumption.

Le contexte historique et épistémologique de l’émergence de la génétique des comportements en tant que discipline trouve ses racines dans différentes disciplines biologiques :la génétique, la biologie de l’évolution et la biologie moléculaire. Ces dernières font partie du paradigme néodarwinien moléculaire. De cette origine, elle a hérité deux grands domaines de recherche, la génétique quantitative et la génétique moléculaire. Ils ont chacun des objectifs et des méthodologies différents. Les études concernant l’intelligence, les comportements agressifs, les comportements addictifs et l’orientation sexuelle permettent notamment d’illustrer ces différences. Elles permettent également de faire un état des lieux des recherches menées dans ce domaine parfois hautement polémique. En fait, la génétique des comportements est marquée par deux ères épistémologiques, l’ère génomique qui a débuté dans les années 1980 et l’ère post-génomique, qui comme son nom l’indique, lui succède dès le début des années 2000. Les résultats apportés par l’ensemble de ces recherches imposent une conclusion, les approches théoriques et techniques phares de l’ère génomique sont insuffisantes à rendre compte de la complexité des phénomènes développementaux liés aux comportements. L’ère post-génomique tente donc de combler les faiblesses de l’ère précédente. Ainsi, la biologie développementale revient au premier plan et ce retour est souhaité depuis longtemps par un courant philosophique majeur né dans les années 1990, la Developmental Systems Theory. L’ère post-génomique est également caractérisée par un pluralisme pragmatique, à la fois théorique et expérimental. La nécessité de multiplier les modes d’appréhension des comportements s’impose car leur complexité intrinsèque est reconnue et tend à être assumée. Les résultats plus récents apportés par les recherches sur l’intelligence, les comportements agressifs, addictifs et l’orientation sexuelle illustrent cette évolution épistémologique. L’opposition entre inné et acquis échoue à rendre compte de la complexité et du dynamisme développemental des phénotypes comportementaux./ The historical and epistemological context of the birth of behavioral genetics as a discipline has its roots in different biological domains: genetics, evolutionary biology and molecular biology. They are parts of the molecular neo-Darwinian paradigm. From this multiple outset, behavioral genetics has inherited two major areas of research, quantitative genetics and molecular genetics. They each have different purposes and methodologies. The study of researches on IQ, aggressive behaviors, addictive behaviors and sexual orientation illustrate these differences. It also permits to make an overview of results provided in this field that is sometimes highly controversial. In fact, behavioral genetics is marked by two epistemological eras, the genomic era that began in the 1980s and the postgenomic era that began by the early 2000s. The results provided by all these researches lead to one conclusion, the theoretical and technical approaches of the genomic era is insufficient to show the complexity of developmental phenomena associated with behaviors. The postgenomic era attempts to correct the weaknesses of the previous era. Thus, developmental biology comes back in the foreground and the necessity of this return has been defended by a major philosophical theory born in 1990, the Developmental Systems Theory. The postgenomic era is also characterized by a theoretical and experimental pragmatic pluralism. The complexity of the developmental patterns of behaviors is recognized and tends to be assumed. The latest results produce by researches on IQ, aggressive behaviors, addiction and sexual orientation illustrate these epistemological changes. The opposition between nature and nurture fails to properly apprehend the developmental dynamism of behavioral phenotypes. / Doctorat en Philosophie / info:eu-repo/semantics/nonPublished

Indiana University-Purdue University Indianapolis (IUPUI) / Losing a job or a significant other are examples of incentive shifts that result in negative emotional reactions. The occurrence of negative life events is associated with increased drinking, and alleviation of negative emotions has been cited as a drinking motive for individuals with problematic drinking patterns (Keyes et al., 2011; Adams et al., 2012). Further, there is evidence that certain genotypes drink alcohol in response to stressful negative life events (Blomeyer et al., 2008; Covault et al., 2007). It is possible that shared genetic factors contribute to both alcohol drinking and emotional reactivity, but there is a critical need for this relationship to be understood. The first aim of this proposal will use an incentive downshift paradigm to address whether emotional reactivity is elevated in mice predisposed to drink alcohol. The second aim of this proposal will address if reactivity to an incentive shift can result in rash action using a differential reinforcement of low rates of responding task, and whether this response is also associated with a predisposition for high drinking. The third aim of this proposal will investigate if experimenter administered ethanol reduces contrast effects, and if an incentive shift increases ethanol consumption in a high drinking line. The overall goal of this proposal is to investigate whether reactivity to incentive shift is an important mechanism underlying alcohol drinking in these mice, and the role an incentive shift may play in producing rash action and influencing ethanol consumption.

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