Research Feed

Research shows birth order has almost no lasting impact on adult personality: middle children score only about 1% higher in honesty–humility and agreeableness, and younger siblings’ greater risk‑taking between ages 10–14 disappears by adulthood. Personality itself evolves across life: neuroticism typically declines, emotional stability improves after 60, and major events like marriage, divorce, or retirement can shift traits in measurable ways. Studies also show intentional change is possible: structured interventions, therapy, and repeated daily behaviors can produce lasting improvements in traits such as extraversion and emotional regulation.

This Newsweek piece reports on the large-scale genomic personality study (46 cohorts, over 1,200 gene variants), highlighting that genetic variants linked to neuroticism predicted more time spent in the hospital. Experts note this reflects association, not causation: possible explanations include neuroticism's link to more complex health presentations, difficulty coping with diagnoses, and less adaptive behaviors like smoking. The article also covers other trait-outcome links: conscientiousness with daytime activity, openness/extraversion with night-owl tendencies, and openness with moving to cosmopolitan areas (suggesting personality and environment reinforce each other). It emphasizes no single "personality gene" exists (effects come from many small variants combined) and that environment still plays a major role alongside genetics.

This Nature news piece reports on the largest genetic study of personality to date, which scanned over one million people and identified roughly 1,200 genetic variants linked to the Big Five traits: more than 800 newly discovered. According to the article, neuroticism-linked variants jumped from 224 to 706 known hits, and conscientiousness went from just 3 to 131. Each variant's individual effect is tiny (the study's own example: the difference between the 50th and 50.35th percentile), but researchers say they collectively explain 5–16% of trait variation. The piece reports that using these genetic links, the study's authors connected traits to real outcomes: conscientiousness tracked with more daytime activity, lower smoking rates, and lower BMI; openness linked to night-owl tendencies and a taste for acquired flavors like coffee and pickles; extraversion correlated with COVID-19 infection risk. The article notes the genetic signal reportedly held up even after accounting for family environment and assortative mating, suggesting that these links aren't just proxies for upbringing or who marries whom.

When it comes to aging well, diet, exercise, and social interaction may get most of the attention – but researchers are increasingly finding there's more to the story.

Highly agreeable people in families often become the "easy one," accommodating others' preferences while suppressing their own. Research on midlife women found suppressed anger, unlike outward anger, doesn't decline with age. Over decades, unvoiced preferences accumulate into resentment. By their late fifties, many such individuals begin asserting themselves, confusing families who mistake this long-delayed self-recognition for a sudden personality change.

This BBC article explores how genes and environment interact to shape personality. Twin studies suggest 40–50% of Big Five personality differences are genetic, but genome-wide association studies find only 9–18% heritability—a gap researchers are working to explain. Environmental influences are equally complex: major life events have little lasting impact, while personality appears to be "poly-environmental," shaped by many small cumulative experiences interacting with genetic predispositions.

A study of 72 software engineering students found that roughly one-quarter of "problematic" learners are actually high-neuroticism "delayed starters" (anxious, deadline-driven students who spike activity 67% within 72 hours of due dates). By contrast, high-conscientiousness students showed steady performance, high-agreeableness students engaged 76% more in forums, and high-openness students accessed 3.2× more optional materials. The author recommends milestone-based assessments and learning analytics to better support personality-driven learning differences.

Journalist Laurie Clarke, who scored with a high percentile for neuroticism on the Big Five personality test, spent six weeks deliberately trying to shift her personality traits through targeted behavioral exercises such as meditating, journaling, attending social events, and practicing kindness. Drawing on real psychological research, she found measurable results: her neuroticism dropped to the 50th percentile, extraversion and agreeableness both improved noticeably. She concludes that intentional personality change is possible, though modest, and requires consistent effort.

The article argues that understanding your personality through the Big Five model (Openness, Conscientiousness, Extraversion, Agreeableness, and Neuroticism) can help reduce stress. When core personality needs go unmet, people exhibit stress behaviors. By identifying where you fall on each trait's spectrum, you can better recognize your personal needs and adjust your habits and environment accordingly; ultimately becoming a calmer, more effective version of yourself.