“It is also of potential pragmatic value, as from an epidemiological standpoint, the changes over the long run, being somewhat negative and centered on young adults would mean that these cohorts would be more vulnerable to problematic mental and physical health outcomes due solely to psychological and not physiological reasons,” he explained.

“It is quite significant from a theoretical perspective to know that global events, like the pandemic, might have the effect of changing personality, which is often thought to be fixed and impervious to change,” Dr. Roberts said.

Medical News Today spoke with Dr. Brent Roberts , a professor of psychology at the University of Illinois at Urbana-Champaign.

The study found that younger individuals were especially susceptible to changes in personality traits during the pandemic, suggesting a disruption of the personality development and maturation process that normally occurs during young adulthood.

However, other personality traits such as agreeableness, openness, extraversion, and conscientiousness declined during the later stages of the COVID-19 pandemic in 2021-2022.

Previous studies have shown that levels of neuroticism declined during the early stages of the COVID-19 pandemic in 2020. A new study published in PLOS One found that these changes in neuroticism were short-lived and normalized later in the pandemic in 2021-2022.

All data and statistics are based on publicly available data at the time of publication. Some information may be out of date. Visit our coronavirus hub for the most recent information on COVID-19.

The present study used data from the Understanding America Study (UAS) to examine the impact of the early and subsequent stages of the COVID-19 pandemic on personality traits in a large and diverse population. The UAS consists of an internet panel of about 9,500 individuals representing the national population. The UAS has administered multiple personality assessments over the internet to enrolled participants since its inception in 2014.

However, there is limited and contradictory evidence on the impact of the pandemic on other personality traits. In addition, there is limited data on the pandemic’s impact on personality traits beyond 2020.

The COVID-19 pandemic differs from other natural disasters in its global impact and influence on all aspects of life. Previous studies have shown a decline in neuroticism during the early or acute stages of the COVID-19 pandemic in 2020. Anecdotal evidence also suggests that many individuals with generally higher anxiety levels — associated with neuroticism — experienced lower anxiety levels during the pandemic’s early phase.

Although regarded as generally stable, personal stressful or traumatic events can influence these personality traits. In contrast, studies examining the impact of collective stressful events, such as the 2011 earthquake in New Zealand or Hurricane Harvey in Texas and Louisiana, have shown a lack of change in personality traits in response to these events.

These personality traits remain relatively stable over an adult’s lifetime and are generally unaffected by personal experience. Previous studies have shown that individuals show a small change in personality traits with age. Specifically, conscientiousness and agreeableness tend to increase gradually with age, whereas neuroticism, openness, and extraversion tend to decrease.

The five-factor model of personality is a widely used model that describes personality based on the presence of five broad traits. The model includes the following five personality traits:

Notably, the changes in the expression of these personality traits were similar to those normally observed during a decade of adulthood. The researchers noted that further research is needed to determine whether the changes in personality traits observed in 2021-2022 were enduring and to evaluate potential longer-term outcomes.

The other four personality traits showed an opposite trend to that observed with neuroticism. The levels of conscientiousness, agreeableness, openness, and extraversion during the acute phase of the pandemic did not differ from their levels before the pandemic. In contrast, the levels of all four traits decreased during 2021-2022 compared with their pre-pandemic levels.

In comparison with pre-pandemic levels, the researchers found that neuroticism decreased during the acute phase of the pandemic in 2020. This decline in neuroticism levels was, however, not sustained during the subsequent adaptation phase in 2021-2022, with levels of neuroticism in the adaptation phase being similar to those observed before the pandemic.

In the current study, the researchers categorized the period encompassing the pandemic into the acute phase spanning the period between March 1, 2020, and December 31, 2020, and the adaptation phase spanning the period between January 1, 2021, and February 16, 2022. The study included 7,109 participants in the UAS who had completed at least one personality assessment before the pandemic and another assessment during either the acute or adaptation phase of the pandemic.

The researchers further analyzed the data to examine the changes in personality traits among different age and ethnic/racial groups.

The researchers found the highest levels of decline in neuroticism during 2020 in participants ages 65 years and over, followed by middle-aged individuals (30-64 years). However, the decline in neuroticism in younger participants ages under 30 years did not reach significance during the acute phase.

Interestingly, younger adults showed higher levels of neuroticism in 2021-2022 than before the pandemic. Although the levels of the four remaining personality traits were lower in 2021-2022 among younger and middle-aged participants, the decline in agreeableness and conscientiousness was more profound among younger participants. In contrast, the levels of agreeableness, conscientiousness, extraversion, and openness among older individuals in 2021-2022 were similar to pre-pandemic levels.

These data suggest that younger adults were more sensitive to changes in personality traits than their middle-aged and older counterparts. The personality of older individuals, on the other hand, seemed more resilient to the effects of the pandemic.

The study’s lead author, Dr. Angelina Sutin, a professor at the Florida State University, noted:

“The traits that showed the most change in younger adulthood – neuroticism and conscientiousness – are also the traits that are associated with many important outcomes, including educational and career success, relationships, and mental and physical health. The changes were relatively small, but the cumulative impact could be significant if the changes persist.”

Personality traits tend to consolidate during young adulthood as an individual’s personality develops and matures. This could potentially explain why younger adults were more vulnerable to changes in personality traits in response to the pandemic. An alternative reason for these findings could be that the sources of stress (such as job- or school-related stress) associated with the pandemic might have been different for each age group.