Pandemic-era stress was associated with measurable personality shifts in a national cohort
The COVID-19 pandemic did more than disrupt routines, work, and social contact. In a large U.S. cohort, personality traits also moved in measurable ways, with the clearest changes emerging after the first acute year of the crisis. Neuroticism fell early in the pandemic, then returned to baseline, while conscientiousness, agreeableness, openness, and extraversion declined later in 2021-2022 compared with pre-pandemic levels.
The pattern matters because personality is usually treated as stable across adulthood. That assumption is useful in clinical psychology and psychiatry, but it can become too rigid when a population faces sustained disruption on the scale of a global pandemic. The data suggest that prolonged stress did not merely affect mood in the moment; it tracked with broader changes in how people reported themselves across enduring behavioral traits.
A nationally representative panel captured two distinct phases of change
The analysis drew on the Understanding America Study, an internet panel of about 9,500 individuals designed to represent the U.S. population. Investigators included 7,109 participants who had completed at least one personality assessment before the pandemic and another assessment during either the acute phase, defined as March 1, 2020 to December 31, 2020, or the adaptation phase, defined as January 1, 2021 to February 16, 2022.
The design created a rare opportunity to compare pre-pandemic personality scores with repeated measures during two very different social environments. The first period was marked by fear, shutdowns, and emergency response. The second brought a longer grind of uncertainty, changing public health guidance, altered work and school structures, and cumulative fatigue. Those conditions offer a plausible psychological route to changes in trait expression, especially for traits tied to self-regulation, trust, curiosity, and social engagement.
The five-factor model used in the study separated personality into extraversion, neuroticism, conscientiousness, agreeableness, and openness. In clinical terms, those dimensions often map onto real-world functioning: organization, emotional reactivity, flexibility, social connectedness, and coping style. A shift in any of them can carry consequences for mental health, adherence, relationships, and work performance.
Neuroticism fell early, then normalized as other traits softened
During the acute phase in 2020, neuroticism declined compared with pre-pandemic levels. That is a striking finding, because neuroticism often rises under threat, yet early pandemic conditions appeared to produce the opposite effect in this cohort. One plausible explanation is that the shared nature of the threat reduced some day-to-day social comparison pressures or temporarily narrowed the range of stressors people were juggling.
The drop did not persist. By 2021-2022, neuroticism was similar to pre-pandemic levels, suggesting a short-lived effect rather than a lasting alteration in emotional style. The later period told a different story for the remaining traits. Conscientiousness, agreeableness, openness, and extraversion were not meaningfully changed in 2020, but all four were lower during 2021-2022 than they had been before the pandemic.
The timing is clinically meaningful. Early in the pandemic, many people were forced into survival mode, with routines simplified and demands reduced in some settings. The later period was less about acute alarm and more about extended adaptation. Persistent strain can blunt sociability, erode cooperative behavior, reduce intellectual curiosity, and make structured self-management harder to sustain. In that sense, the personality profile may have mirrored prolonged environmental wear rather than a response to the initial shock alone.
Younger adults carried the largest personality burden
Age shaped the findings in an important way. Adults 65 years and older had the largest decline in neuroticism during 2020, followed by middle-aged adults. Among participants under 30, the acute-phase drop in neuroticism did not reach significance. The direction reversed later: younger adults showed higher neuroticism in 2021-2022 than before the pandemic, while middle-aged adults also showed lower scores across several traits.
The most pronounced later declines in younger adults involved agreeableness and conscientiousness. Older adults looked comparatively steady in 2021-2022, with agreeableness, conscientiousness, extraversion, and openness similar to pre-pandemic levels. The overall picture points to greater personality plasticity in young adulthood, the life stage when these traits normally continue to consolidate.
One sentence captures the bedside implication: younger adults appeared to absorb more of the pandemic’s psychological strain into trait-level behavior. The result aligns with a developmental model in which young adulthood is still a period of active maturation, making it more vulnerable to prolonged disruption in work, schooling, relationships, and identity formation. If the social environment changes sharply during that window, the effects may register in the very traits that support academic success, occupational stability, and health behavior.
Hispanic and Latino participants showed a different pattern
Ethnic and racial subgroup analysis added another layer. Hispanic and Latino participants showed larger declines in extraversion, conscientiousness, and openness in 2021-2022 than non-Hispanic and non-Latino participants. The study raised the possibility that these differences may reflect greater pandemic stress among Hispanic and Latino individuals, including higher likelihood of working outside the home and higher COVID-19 exposure risk.
Those differences are important because they suggest the pandemic did not distribute psychological strain evenly. Social position, job exposure, and household structure likely shaped the magnitude of personality change. The traits affected here are not abstract labels; they influence how people organize their days, whether they seek novel solutions, how they relate to others, and how consistently they follow through on responsibilities.
Personality change does not equal permanent personality change
The data showed change, not causation. The study was observational and lacked a control group, so no one can conclude from these findings alone that the pandemic directly caused the shifts. Other forces were moving at the same time, including social unrest, political turbulence, and economic disruption. A concurrent rise in long COVID also complicates interpretation, because persistent symptoms could affect stress, cognition, energy, and social functioning in ways that resemble or amplify personality change.
The authors also cautioned that the U.S.-only sample limits generalizability, and the smaller number of participants from minoritized groups may have reduced the ability to detect subgroup-specific effects. Even with those limits, the result remains clinically useful: global events can coincide with shifts in traits long considered relatively fixed.
Dr. Brent Roberts framed the implications in practical terms, noting that long-run changes centered on young adults could translate into vulnerability to mental and physical health problems for psychological reasons alone. Dr. Angelina Sutin added that the traits most changed in younger adulthood, especially neuroticism and conscientiousness, are tied to education, career success, relationships, and health. Small average changes can still accumulate across a population if they persist.
The next question is not whether personality can move under extreme collective stress; this study suggests it can. The remaining task is to determine whether these changes fade, consolidate, or forecast later mental health and functional outcomes as the pandemic’s psychological aftermath continues to unfold.