Department of Psychology and Institute for Neuroscience, University of Texas at Austin, TX 78712, USA.
Dev Psychobiol. 2011 May;53(4):343-58. doi: 10.1002/dev.20524. Epub 2011 Mar 1.
In hamsters, individual differences in offensive aggression are associated with impulsive choice, leading to the characterization of a distinct impulsive-aggressive phenotype. This study had two goals: to determine the developmental trajectory of the maturation of this phenotype and to address its parental lineage. Interestingly, individuals most aggressive as adults were less likely to attack in early puberty. However, looking at the transition of agonistic behavior from play fighting to adult aggression, impulsive-aggressive individuals were less likely to engage in play fighting attacks and more likely to engage in more mature agonistic behavior. Additionally, parental lineages were compared for the aggressive responses expressed by their adult offspring. Most impulsive-aggressive individuals were offspring of few select males, which were more likely to produce this phenotype, without an association with females or specific litters. These findings identify an abnormal and accelerated development of agonistic behavior in impulsive-aggressive individuals and a likelihood of heritability.
在仓鼠中，攻击性的个体差异与冲动选择有关，导致了一种独特的冲动攻击性表型的特征化。本研究有两个目标：确定这种表型成熟的发展轨迹，并解决其亲本谱系。有趣的是，成年时攻击性最强的个体在早期青春期时不太可能攻击。然而，从玩耍战斗到成年攻击的竞争行为转变来看，冲动攻击性个体不太可能进行玩耍战斗攻击，而更可能进行更成熟的竞争行为。此外，还比较了亲代谱系中成年后代表现出的攻击性反应。大多数冲动攻击性个体是少数精选雄性的后代，这些雄性更有可能产生这种表型，而与雌性或特定窝无关。这些发现确定了冲动攻击性个体竞争行为的异常和加速发展，以及遗传的可能性。
