Testosterone and aggressiveness

2009

Aggressiveness is an ancestral behavior common to all animal species. Its neurophysiological mechanisms are similar in all vertebrates. Males are generally more aggressive than females. In this review, aggressive behavior in rodents, monkeys, and man and the role of testosterone and brain serotonin levels have been considered. Interspecifi c aggressiveness in rats has been studied considering the mouse-killing behavior; the neonatal androgenization of females increases adult mousekilling as does the administration of testosterone in adults. Intraspecifi c aggressiveness was studied by putting two or more male rats (or mice) in the same cage; the condition of subjection or dominance is infl uenced by testosterone.

Brain Sciences, 2021

Aggressive behavior is modulated by many factors, including personality and cognition, as well as endocrine and neural changes. To study the potential effects on the reaction to provocation, which was realized by an ostensible opponent subtracting money from the participant, we administered testosterone (T) and arginine vasopressin (AVP) or a respective placebo (PL). Forty males underwent a functional magnetic resonance imaging session while performing a provocation paradigm. We investigated differential hormone effects and the potential influence of Machiavellian traits on punishment choices (monetary subtractions by the participant) in the paradigm. Participants in the T/AVP group subtracted more money when they were not provoked but showed increased activation in the inferior frontal gyrus and inferior parietal lobule during feedback compared to PL. Higher Machiavellian traits significantly increased punishing behavior independent of provocation only in this group. The pilot stud...

Hormones and Behavior, 2004

Research on testosterone-behavior relationships in humans is assessed in relation to a version of the challenge hypothesis, originally proposed to account for testosterone-aggression associations in monogamous birds. Predictions were that that testosterone would rise at puberty to moderate levels, which supported reproductive physiology and behavior. Sexual arousal and challenges involving young males would raise testosterone levels further. In turn, this would facilitate direct competitive behavior, including aggression. When males are required to care for offspring, testosterone levels will decrease. Testosterone levels will also be associated with different behavioral profiles among men, associated with life history strategies involving emphasis on either mating or parental effort. Most of these predictions were supported by the review of current research, although most studies were not designed to specifically test the challenge hypothesis.

2023

Arde la vida, 2020

Relatos que entrelazan amores, desencuentros, amigos, tropiezos, aventuras, la búsqueda de una libertad imposible, el encuentro con el horror, la risa en el dolor, la inocencia de mostrarse irrompible y un disfraz que se cansó o de ser usado y no puede huir porque está adherido a ese ente que solemos llamar persona. ¿Qué hay debajo del disfraz? ¿Y si no hubiera nada? ¿Cuál es el precio de vivir con esa nada? www.lectulandia.com-Página 2

The Routledge Handbook of Cartographic Humanities, edited by Tania Rossetto and Laura Lo Presti, 2024

Late Antiquity (c. 250–750 CE) marks an important moment in the history of geography and mapmaking. Maps took a more prominent role in intellectual life, and geography was largely integrated into school curricula. Drawing upon both textual and iconographic sources, this contribution analyses the role played by texts and illustrations in the development of geographical imagination and knowledge. An up-to-date overview on the Tabula Peutingeriana highlights the interplay of texts, diagrams, memory and travel within the context of late antique cartography.