Study Suggests Childhood Unpredictability Is Linked to Certain Psychopathic Traits in Adulthood

Growing up in an unpredictable, chaotic household may increase the likelihood of developing certain psychopathic personality traits in adulthood, particularly among men, according to new research. The findings, published in Personality and Individual Differences, suggest that instability during childhood may have a stronger influence on later personality than poverty alone, highlighting the importance of early prevention and intervention.

Rather than viewing psychopathy as a single condition, psychologists increasingly describe it as a collection of related personality traits. The new study found that childhood unpredictability was most strongly linked to higher levels of impulsivity and callousness, while different forms of adversity appeared to affect men and women in distinct ways.

How psychopathic traits are defined

Modern psychology commonly uses the Triarchic Model of psychopathy, which divides psychopathic traits into three separate dimensions: meanness, disinhibition and boldness.

Meanness refers to low empathy, emotional coldness and a willingness to exploit others for personal gain. Disinhibition describes poor impulse control, difficulty planning ahead and emotional instability. Boldness includes social confidence, fearlessness and the ability to remain calm under pressure, qualities that can sometimes be adaptive rather than harmful.

Importantly, these traits exist on a continuum throughout the general population and do not automatically indicate a psychiatric disorder. Researchers typically assess them using questionnaires such as the Triarchic Psychopathy Measure, allowing them to examine how normal personality variation relates to life experiences.

Harshness and unpredictability are not the same

The researchers based their work on life history theory, which proposes that people unconsciously adapt their behavior to the safety and predictability of the environment in which they grow up. Stable, supportive childhoods tend to encourage cooperation and long-term planning, whereas uncertain environments may promote more short-term, risk-oriented strategies.

A key feature of the study was distinguishing between two different types of childhood adversity.

Harshness refers to ongoing hardship, such as persistent poverty or limited access to basic resources. Unpredictability, on the other hand, reflects growing up in an unstable environment marked by inconsistent caregiving, frequent household changes or unpredictable daily routines, even when financial resources are sufficient.

Lead author Virgil Zeigler-Hill explained that a child may experience material deprivation within a stable household, or conversely, grow up in a financially comfortable but highly chaotic home. The researchers wanted to determine which type of adversity was more closely associated with different psychopathic traits.

Large study across two countries

The researchers combined data from three independent studies involving a total of 4,873 participants between 18 and 79 years of age. The sample included 2,919 women and 1,954 men from both the United States and Israel, representing community volunteers as well as university students.

Participants completed the Perceived Childhood Harshness and Unpredictability Scale, which measures experiences such as financial strain, household stability and the predictability of everyday life during childhood.

They also completed versions of the Triarchic Psychopathy Measure, rating statements related to impulsivity, emotional functioning and interpersonal behavior.

By examining childhood harshness, unpredictability and gender simultaneously, the researchers were able to isolate the unique effects of each factor rather than combining all forms of adversity into a single measure.

Chaotic childhoods linked to impulsivity and callousness

The strongest associations involved childhood unpredictability.

Adults who remembered growing up in unstable, unpredictable households reported higher levels of disinhibition, meaning they were more likely to describe themselves as impulsive, emotionally reactive and prone to acting without planning ahead.

Childhood unpredictability was also associated with higher levels of meanness. Participants who experienced more instability were somewhat more likely to report emotionally detached, callous or exploitative interpersonal tendencies.

These associations remained even after researchers accounted for childhood harshness and gender, suggesting that instability itself contributes independently to these personality characteristics.

According to Zeigler-Hill, the findings reinforce the idea that psychopathy is multidimensional rather than a single personality construct. Among the three dimensions, meanness and disinhibition showed the clearest links to unpredictable childhood experiences, whereas boldness was affected much less.

Men appeared more strongly affected

The association between childhood unpredictability and both meanness and disinhibition was stronger among men than among women.

Although the differences were relatively small, they appeared consistently across all three datasets. The researchers suggest this pattern fits with evolutionary perspectives proposing that men growing up in uncertain environments may be more likely to adopt dominance-oriented and risk-taking behaviors aimed at securing immediate resources or social status.

Importantly, the study does not suggest that boys raised in chaotic homes inevitably develop psychopathic traits. Instead, it indicates that instability may slightly shift average personality tendencies toward greater impulsivity and callousness within the broader population.

Poverty alone showed a different pattern

The role of childhood harshness was more limited and, in some respects, unexpected.

Initially, harshness showed a small association with higher disinhibition. However, after researchers controlled for childhood unpredictability and gender, this relationship disappeared and even became slightly negative, suggesting that previous studies linking adversity to impulsivity may have been capturing the effects of instability rather than poverty itself.

Harshness was linked to boldness only among women. Women who remembered growing up with greater material deprivation tended to report lower levels of fearlessness, confidence and social dominance.

The researchers speculate that prolonged hardship may encourage greater vigilance and sensitivity to potential threats, making boldness less likely to develop. However, they stress that this finding was modest and requires confirmation in future studies.

The findings do not prove cause and effect

The authors caution that the study cannot establish causality because it relied on adults recalling their childhood experiences.

Current personality may influence how people remember early life, while other factors—including genetics, parenting style and family conflict—could affect both childhood environments and adult personality.

In addition, the study measured harshness primarily through financial deprivation. Other forms of adversity, including emotional abuse, physical abuse, parental mental illness or exposure to violence, may influence personality in different ways.

The researchers argue that future longitudinal studies following children over many years would provide a clearer picture of how instability, caregiving and environmental stress interact with biological factors to shape personality development.

They also emphasize that the study examined psychopathic traits as normal personality dimensions rather than clinical psychopathy. An unstable childhood does not determine anyone's future, and many people raised in chaotic homes develop into empathetic, emotionally healthy adults.

Article prepared by Victoria Caldwell.