Experiencing abuse or neglect in childhood can increase the risk of intimate partner violence later in life. New research published in Lancet Community Health Europe reveals that childhood trauma changes a person’s mental health and personality, increasing their vulnerability to relationship abuse. These psychological changes account for much of the increased risk and suggest new ways to protect survivors.
Previous research has shown that people who faced abuse or neglect as children are three to six times more likely to experience intimate partner violence as adults. To understand why this pattern exists, researchers looked at the psychological characteristics that link early trauma to later victimization. Patrizia Pezzoli, a researcher at University College London, led the study.
Pezzoli and her team wanted to understand whether certain psychological characteristics act as a bridge to convey the effects of childhood trauma. They also considered alternative explanations. They wondered whether individuals simply inherited a wide range of vulnerabilities to different types of harm through their genes or family environment.
This genetic vulnerability has to do with how genetics and shared family environment influence human behavior. Genes do not directly cause someone to become a victim of abuse. Rather, genetic factors shape how a person thinks, feels, and behaves.
Certain behavioral characteristics may make certain experiences more likely. By pinpointing how childhood trauma increases the risk of later abuse, experts can design better prevention programs. Currently, most violence prevention efforts rely on extensive relationship education in schools.
To uncover genetic predispositions that are a direct result of trauma, researchers analyzed data from the Twin Early Development Study. The project contains information on the health and behavior of more than 11,000 twins born in the UK in the 1990s. By comparing twins, researchers can distinguish between characteristics common to families and characteristics unique to each person’s life experiences.
The dataset included assessments conducted when participants were 22 years old. Participants answered questions regarding their history of childhood abuse. They also reported abuse they experienced within their adult romantic relationships.
The research team measured 18 different mental health and personality traits. These traits include key personality indicators such as extraversion, agreeableness, candor, and conscientiousness. They also looked at mental health issues such as depressive symptoms, anxiety, peer problems, and attention deficit hyperactivity disorder.
The researchers used statistical methods to evaluate genetic risk scores like a natural experiment. This method helps scientists test whether a particular factor actually causes an outcome, rather than just being loosely associated with it. By combining twin comparisons and genetic data, the team was able to minimize the influence of common environmental factors that often confound study results.
Before finalizing the study plan, the scientists also consulted individuals who had first-hand experience with these issues. These experts provided insight into the psychological factors that mediate the association between abuse and relationship violence. Input from this lived experience guided the selection of characteristics to measure and helped shape how the team interpreted the data.
Researchers have found that childhood abuse leaves an independent mark on psychological development. This effect appeared even after accounting for genetic vulnerability to damage. They identified three specific psychological characteristics that link early trauma to subsequent domestic violence.
These associated factors are decreased subjective well-being, problem behavior, and aggression. Subjective well-being refers to an individual’s general satisfaction with relationships, community, and financial security. People who face adversity early on often report lower levels of happiness.
The researchers noted that this dissatisfaction may reflect a reduced ability to build supportive social networks. Strong social networks usually protect people from future harm. When trauma impairs our ability to form these bonds, we become even more vulnerable to abusive partners.
Problem behaviors and aggression include behaviors such as anger, hostility, and physical or verbal aggression. These behaviors often emerge as a coping mechanism for children as they navigate hostile or unpredictable environments. Over time, emotions and behaviors can become harder to manage, increasing vulnerability to relationship abuse.
People who display aggressive traits also face an increased risk of engaging in mutual violence. This is partly because individuals often choose partners with similar behavioral tendencies. Intervening to help young people regulate these behaviors can reduce their likelihood of falling into abusive power relationships.
Overall, this study revealed that psychological pathways accounted for the majority of the relationship between childhood maltreatment and subsequent partner violence. Intermediate mental health and personality traits explained 65 percent of the total effect. This means that a significant portion of the risk operates through psychological variation rather than common genetics.
The researchers also looked at other characteristics, such as risk-taking, which are often linked to revictimization. They found that risk-taking was not a strong mediating factor when genetic and environmental overlaps were considered. This finding warns against victim-blaming discourses that actively seek out dangerous situations.
Risk-taking may simply reflect a desire to satisfy unmet emotional needs. Recognizing this allows us to shift our focus away from blaming the victim. This allows society to view interpersonal risk as a combination of personal, structural, and situational factors.
Pezzoli clarified the nature of these mediating properties in a press release. “These psychological vulnerabilities may appear as adaptations to difficult environments rather than character flaws,” Pezzoli says. “This distinction is important because the findings of this study should not be misconstrued as condemning individual experiences.”
The researchers also emphasized that genetic influences do not excuse perpetrators from their actions. Genetic characteristics only provide context for how individuals navigate the social world. Understanding these vulnerabilities provides tools for prevention rather than a shift in moral responsibility.
The researchers acknowledged that their study had some limitations. This study is based on participants self-reporting their experiences at a single point in time. The demographics of the sample were primarily heterosexual and Caucasian.
This lack of diversity may limit the extent to which the results apply to other populations. Different minority groups may encounter unique contextual risks that are not captured by this data. The study did not assess whether the participants themselves had been violent, nor did it examine the characteristics of their partners.
Future studies should replicate these results in more diverse populations. Scientists can also investigate specific cognitive mechanisms to better understand early trauma. For example, assessing how the brain processes rewards could shed more light on why some survivors have trouble forming relationships.
Despite these limitations, the current results provide a clear roadmap for developing targeted prevention programs. Broad relationship education programs are unlikely to meet the needs of highly vulnerable young people. Tailor-made interventions that specifically address the effects of childhood trauma may offer greater protection.
“The characteristics identified in this study are not inevitable or permanent consequences of childhood maltreatment,” Pezzoli said. Early intervention can focus directly on improving young people’s well-being and helping them manage aggressive reactions.
Adolescence is a particularly important period for such targeted efforts. Early romantic experiences often shape a person’s lifelong romantic patterns. By helping vulnerable young people navigate their first relationship safely, professionals can reduce harm in the short term and promote healthier connections throughout life.
The study, “Personality and mental health as mediators linking childhood abuse and intimate partner violence victimization: Mendelian randomization and causal direction twin studies,” was authored by Patrizia Pezzoli, Wikus Barkhuizen, Olakunle Oginni, Jean-Baptiste Pingault, Eamon McCrory, and Essi Viding.
