Study finds unpredictable childhood environments are linked to borderline personality traits in adulthood

Key Points:

• Research published in Evolutionary Psychological Science found that adults who remembered their childhoods as unstable and unpredictable reported higher levels of emotional, interpersonal, impulsive, and dissociative borderline traits.
• The study distinguished between childhood harshness (chronic hardship) and unpredictability (instability in caregiving and routines), revealing that unpredictability was consistently linked to increased borderline traits across diverse samples from the U.S. and Israel.
• Childhood harshness showed a weaker and less consistent relationship with borderline traits, and in some cases, its association diminished when unpredictability was taken into account, suggesting that unpredictability may be a more critical factor.
• Gender differences in the association between unpredictability and certain borderline traits were inconsistent across samples, and the study emphasized that these findings are correlational and based on adults' retrospective self-reports.
• The research highlights the importance of childhood environmental predictability in the development of borderline personality traits, suggesting that early instability may play a more significant role than the severity of hardship alone.