Personality disorders
Personality disorders (PD) concern inflexible and maladaptive cognitive, emotional, and behavioural patterns, which cause significant functional impairment or subjective distress. One group of PD is characterized by ‘eccentricity’, another by ‘dramatic’ behaviour, and a third cluster by predominant anxiety. Personality traits reflect individual patterns of behaviour that serve the purpose to achieve important biosocial goals. These behaviours can be grouped according to their interpersonal meaning: dominance versus submission; competition versus cooperation; dependence versus nurturance; assertion versus avoidance; aggression versus defence; and risk-taking versus harm avoidance. From a life-history perspective, personality traits, as well as personality disorders representing the extremes of variation of normal trait distribution, can be differentiated into ‘fast’ and ‘slow’ life-history strategies. Predictions about future resource availability arise from early childhood experiences with caregivers and the interaction of these experiences with genes involved in the regulation of aggression, attachment, etc.