Jean M. Twenge

San Diego State University | SDSU · Department of Psychology

Numerous investigations to date have established the benefits of expressing gratitude for improved psychological well-being and interpersonal relationships. Nevertheless, the social dynamics of gratitude remain understudied. Do the effects of gratitude differ when it is expressed privately, communicated directly to the benefactor one-to-one, or sha...

It is common for psychology studies to rely solely on linear correlation (r) or similar statistics and not include other measures of association (such as relative risk, which examines differences in the number of people affected). For example, the association between smoking and lung cancer (r = 0.06) could be dismissed as “small” if only linear r...

This study examines associations between media use and mental health for adolescents prior to and during the COVID-19 pandemic. Using two separate datasets that sampled adolescents (8th, 10th, and 12th graders) in 2018 (n = 31,825) and 2020 (n = 1,523), mental health (hopelessness and happiness), media use (time spent using a variety of media), and...

Background Children and adolescents spend an increasing amount of time with screen media. Identifying correlates of youth mental disorders has become more urgent with rates of depression, self-harm, suicide attempts, and suicide deaths rising sharply among U.S. children and adolescents after 2012. This study examined the relationship between screen...

Objectives Public health trends are formed by political, economic, historical and cultural factors in society. The aim of this paper was to describe overall changes in mental health among adolescents and adults in a Norwegian population over the three last decades and discuss some potential explanations for these changes. Design Repeated populatio...

An important 2019 paper applied a novel analytic technique called Specification Curve Analysis (SCA) to data from three large-scale community samples to investigate the association between adolescent technology use and mental health/well-being. The paper concluded that an association exists but is tiny, with median betas between −0.01 and −0.04. Th...

Scholars posit that economically prosperous times should produce higher individualism and narcissism, and economically challenging times lower individualism and narcissism. This creates the possibility that narcissism among U.S. college students, which increased between 1982 and 2009, may have declined after the Great Recession. Updating a cross-te...

Screen media use is associated with mental health problems among adolescents. However, few studies have examined screen media use using contemporaneous time diaries (rather than retrospective reports), compared associations across specific screen media activities or by gender, or examined associations with self-harm behaviors. Participants were 13-...

Introduction Several studies have documented increases in adolescent loneliness and depression in the U.S., UK, and Canada after 2012, but it is unknown whether these trends appear worldwide or whether they are linked to factors such as economic conditions, technology use, or changes in family size. Methods The Programme for International Student...

Background Events from spring to fall 2020, including the COVID-19 pandemic, hate crimes, and social unrest, may have impacted mental health, particularly mood and anxiety disorders. This study compares rates of positive screens for anxiety and depressive disorders in separate U.S. national samples from 2019 and April to September 2020. The analysi...

Rationale Understanding how health has changed in response to the COVID-19 pandemic is critical to recovering from the pandemic. Objective This study focused on how sleep characteristics in the United States may be different from before to during the COVID-19 pandemic. Methods To this end, the sleep characteristics of a nationally representative...

Objective This study aims to document the impact of the COVID‐19 pandemic on mental health. Method We compared a nationally representative online sample of 2,032 U.S. adults in late April 2020 to 19,330 U.S. adult internet users who participated in the 2018 National Health Interview Survey (NHIS) using the Kessler‐6 scale of mental distress in the...

Background The disruptions to daily life caused by the coronavirus disease 2019 (COVID‐19) pandemic may have impacted mental health, particularly mood disorders. This study aimed to compare prevalence rates of anxiety disorder and depressive disorder in national samples in the U.S. before and during the pandemic. Methods Participants (n = 336,525)...

Objectives: Few studies have sought to evaluate how screen media use relates to symptoms of sleep-wake disturbances. To extend these prior studies in a large sample of children, this study examined associations of different types of screen media with symptom severity of different classes of sleep-wake disturbances. This study was pre-registered her...

Is there a growing class divide in happiness? Among U.S. adults ages 30 and over in the nationally representative General Social Survey (N = 44,198), the positive correlation between socioeconomic status (SES; including income, education, and occupational prestige) and happiness grew steadily stronger between the 1970s and 2010s. Associations betwe...

It is unclear whether Americans spent less time on non‐digital social interaction in the 2010s than in the 2000s. In the nationally representative American Time Use Survey administered by the Bureau of Labor Statistics (n = 191,558), U.S. residents 15 years of age and older spent 10 to 11 fewer minutes a day in non‐digital social interaction during...

Objective: Increases in depression among adolescents have been concurrent with increases in digital media use. In this article, recent trends in mental health among U.S. adolescents and young adults are discussed and theories about their possible connection with concurrent increases in digital media use are presented. Methods: Large studies of t...

We have documented increases since 2012 in depressive symptoms, suicide-related outcomes, and suicide and identified associations between digital-media use and depressive symptoms and suicide-related outcomes across two data sets: Monitoring the Future (MtF) and the Youth Risk Behavior Surveillance System (YRBSS). Ophir, Lipshits-Braziler, and Rose...

Introduction: Adolescents spend an increasing amount of time using digital media, but gender differences in their use and in associations with psychological well-being are unclear. Method: We drew from three large, representative surveys of 13- to 18-year-old adolescents in the U.S. and UK (total N = 221,096) examining digital media use in hours...

Previous research established a substantial increase in support for same-sex marriage in the US, but it is unclear if this increase is due to cohort (a change that affects only the younger generation) or time period (a change that affects those of all ages). In a nationally representative sample of American adults (n = 13,483) in 1988 and 2004–2018...

We examined trends over time in vocabulary, a key component of verbal intelligence, in the nationally representative General Social Survey of U.S. adults (n = 29,912). Participants answered multiple-choice questions about the definitions of 10 specific words. When controlled for educational attainment, the vocabulary of the average U.S. adult decli...

[This corrects the article DOI: 10.1371/journal.pone.0121454.].

Purpose: Past work has evidenced increased utilization of mental health services on college campuses, as well as rising rates of mood and suicide-related pathology in adolescents and young adults in recent years. We examined whether such findings are reflective of large-scale, nationwide trends in college student mental health in the past decade....

Adolescents spend a substantial and increasing amount of time using digital media (smartphones, computers, social media, gaming, Internet), but existing studies do not agree on whether time spent on digital media is associated with lower psychological well-being (including happiness, general well-being, and indicators of low well-being such as depr...

Studies using large samples consistently find that more frequent users of digital media are lower in psychological well-being than less frequent users; even data sets used as evidence for weak effects show that twice as many heavy users (vs. light users) are low in well-being. Differences in perspective may stem from the statistics used; I argue th...

Both academic and popular literatures have repeatedly contended that emerging adults are the most narcissistic and entitled age-group in modern times. Although this contention is fiercely debated, the message that emerging adults are narcissistic and entitled has saturated popular culture. Despite this saturation, relatively little empirical work h...

In nationally representative samples of U.S. adolescents (age: 13–18) and entering college students, 1976–2017 (N = 8.2 million), iGen adolescents in the 2010s (vs. previous generations) spent less time on in-person (face-to-face) social interaction with peers, including getting together or socializing with friends, going to parties, going out, dat...

Drawing from the National Survey on Drug Use and Health (NSDUH; N = 611,880), a nationally representative survey of U.S. adolescents and adults, we assess age, period, and cohort trends in mood disorders and suicide-related outcomes since the mid-2000s. Rates of major depressive episode in the last year increased 52% 2005-2017 (from 8.7% to 13.2%)...

Previous research on associations between screen time and psychological well-being among children and adolescents has been conflicting, leading some researchers to question the limits on screen time suggested by physician organizations. We examined a large (n = 40,337) national random sample of 2- to 17-year-old children and adolescents in the U.S....

Studies have produced conflicting results about whether digital media (the Internet, texting, social media, and gaming) displace or complement use of older legacy media (print media such as books, magazines, and newspapers; TV; and movies). Here, we examine generational/time period trends in media use in nationally representative samples of 8th, 10...

This article explores links between cultural individualism and the age at which adult-role responsibilities are assumed (the speed of maturation to adulthood). Across 43 years (1973-2015) within the United States, yearly indicators of individualism were positively correlated with later onset of work and family responsibilities (a slow life strategy...

In nationally representative yearly surveys of United States 8th, 10th, and 12th graders 1991–2016 (N = 1.1 million), psychological well-being (measured by self-esteem, life satisfaction, and happiness) suddenly decreased after 2012. Adolescents who spent more time on electronic communication and screens (e.g., social media, the Internet, texting,...

Psychological entitlement is a stable personality trait known to predict a range of concerning outcomes in people’s lives. Recent research has suggested that entitlement might have domain-specific manifestations such as romantic entitlement, academic entitlement, and sexual entitlement. The present work sought to examine such a domain specific mani...

In two nationally representative surveys of U.S. adolescents in grades 8 through 12 (N = 506,820) and national statistics on suicide deaths for those ages 13 to 18, adolescents’ depressive symptoms, suicide-related outcomes, and suicide rates increased between 2010 and 2015, especially among females. Adolescents who spent more time on new media (in...

American adults had sex about nine fewer times per year in the early 2010s compared to the late 1990s in data from the nationally representative General Social Survey, N = 26,620, 1989–2014. This was partially due to the higher percentage of unpartnered individuals, who have sex less frequently on average. Sexual frequency declined among the partne...

The social and historical contexts may influence the speed of development. In seven large, nationally representative surveys of U.S. adolescents 1976–2016 (N = 8.44 million, ages 13–19), fewer adolescents in recent years engaged in adult activities such as having sex, dating, drinking alcohol, working for pay, going out without their parents, and d...

Evidence is accumulating that American culture has become more individualistic since the 1950s. In the present research, we focused on one plausible manifestation of individualism, the use of swear words in cultural products. We examined trends in the use of the seven words identified by George Carlin in 1972 as the “seven words you can never say o...

In three large, nationally representative surveys of U.S. 12 th graders, college students, and adults ( N = 9 million) conducted 1968–2015, Americans became significantly more supportive of legal marijuana (cannabis) starting in the mid-1980’s. Hierarchical models using age-period-cohort analysis on the adult (General Social Survey) sample showed t...

Examining age, time period, and cohort/generational changes in sexual experience is key to better understanding sociocultural influences on sexuality and relationships. Americans born in the 1980s and 1990s (commonly known as Millennials and iGen) were more likely to report having no sexual partners as adults compared to GenX’ers born in the 1960s...

The Great Recession's influence on American undergraduate students' values was examined, testing Greenfield's and Kasser's theories concerning value development during economic downturns. Study 1 utilised aggregate-level data to investigate (a) population-level value changes between the pre-recession (2004-2006: n = 824,603) and recession freshman...

Orth, Trzesniewski, and Robins (2010) concluded that the nationally representative Americans’ Changing Lives (ACL) cohort-sequential study demonstrated moderate to large age differences in self-esteem, and no birth cohort (generational) differences in the age trajectory. In a reanalysis of these data using 2 different statistical techniques, we fin...

We examined change over time in the reported prevalence of men having sex with men and women having sex with women and acceptance of those behaviors in the nationally representative General Social Survey of U.S. adults (n’s = 28,161–33,728, ages 18–96 years), 1972–2014. The number of U.S. adults who had at least one same-sex partner since age 18 do...

In three nationally representative surveys of U.S. residents (N = 10 million) from 1970 to 2015, more Americans in the early 2010s (vs. previous decades) identified as Independent, including when age effects were controlled. More in the early 2010s (vs. previous decades) expressed polarized political views, including stronger political party affili...

Continuing a long-standing trend in the U.S. Social Security Administration database of first names (N = 358 million), American parents were less likely to choose common names for their children between 2004 and 2015, including the years of the Great Recession (2008–2010). These trends were similar in California (severely affected by the recession)...

Despite frequent references to “the changing nature of work,” little empirical research has investigated proposed changes in work context perceptions. To address this gap, this study uses a cross-temporal meta-analysis to examine changes in five core job characteristics (e.g., task identity, task significance, skill variety, autonomy, and feedback...

In a recent study, Bianchi (2014) showed that macroeconomic conditions (i.e. average unemployment rate) during the years of emerging adulthood (ages 18 to 25) are inversely related to adult narcissism. Fletcher (2015) called into question the robustness of the results and Grijalva et al. (2015) presented meta-analytic support for real gender differ...

We propose that generational differences are meaningful despite some theoretical and methodological challenges (cf. Costanza & Finkelstein, 2015). We will address five main issues: operationalizing generations, measuring generational differences, theoretical models of generations, mechanisms of generational change, and the importance of science ver...

This chapter focuses on the role of narcissism in emerging media use and culture. “Narcissism” will refer to the grandiose form unless otherwise noted. The chapter begins by providing a description of narcissism as an individual trait and as a socio-cultural process. It discusses the research findings on narcissism and emerging media. Finally, the...

In four large, nationally representative surveys (N = 11.2 million), American adolescents and emerging adults in the 2010s (Millennials) were significantly less religious than previous generations (Boomers, Generation X) at the same age. The data are from the Monitoring the Future studies of 12 th graders (1976–2013), 8 th and 10 th graders (1991–2...

In the nationally representative General Social Survey, U.S. Adults (N = 33,380) in 2000-2012 (vs. the 1970s and 1980s) had more sexual partners, were more likely to have had sex with a casual date or pickup or an acquaintance, and were more accepting of most non-marital sex (premarital sex, teen sex, and same-sex sexual activity, but not extramari...

Americans have become increasingly tolerant of controversial outgroups in results from the nationally representative General Social Survey (1972–2012, N = 35,048). Specifically, adults in the 2010s (versus the 1970s and 1980s) were more likely to agree that Communists, homosexuals, the anti-religious, militarists, and those believing Blacks are gen...

What makes low social status toxic to well-being? To internalize social status is to believe the self is responsible for it. We hypothesized that the more people internalize low subjective social status, the more their basic psychological needs are thwarted. Experiment 1 randomly assigned participants to imagine themselves in low, middle, or high s...

Between 1972 and 2012, Americans became significantly less trusting of each other and less confident in large institutions, such as the news media, business, religious organizations, the medical establishment, Congress, and the presidency. Levels of trust and confidence, key indicators of social capital, reached all-time or near-all-time lows in 20...

Based on Greenfield’s theory of social change and human development, we predicted that adolescents’ values, behaviors, and self-assessments would become more collectivistic and less individualistic during the Great Recession (2008–2010) compared to the prerecession period (2004-2006), thereby reversing long-term trends from the 1970s. Data came fro...

Comments on the original article by Paris (see record 2012-18549-001) regarding narcissistic personality disorder. The current authors agree with Paris that modern life is making people more narcissistic. In fact, the authors demonstrate with this commentary, the case for increasing narcissism is even stronger than presented in his article. An expl...

Across four surveys (N = 6.9 million), Americans reported substantially higher levels of depressive symptoms, particularly somatic symptoms, in the 2000s–2010s compared to the 1980s–1990s. High school students in the 2010s (vs. the 1980s) reported more somatic symptoms (e.g., trouble sleeping, thinking, and remembering; shortness of breath) and wer...

Recent research has shown that narcissistic men in the United States express more ambivalent sexism than their non-narcissistic counterparts. The present study sought to extend these findings by hypothesizing that psychological entitlement would be a predictor of ambivalent sexism but that that this relationship may vary by gender. Given entitlemen...

We examined whether culture-level indices of threat, instability, and materialistic modeling were linked to the materialistic values of American 12th graders between 1976 and 2007 (N = 355,296). Youth materialism (such as the importance of money and of owning expensive material items) increased over the generations, peaking in the late 1980s to ear...

Change over time in culture can appear among individuals and in cultural products such as song lyrics, television, and books. This analysis examines changes in pronoun use in the Google Books ngram database of 766,513 American books published 1960-2008. We hypothesize that pronoun use will reflect increasing individualism and decreasing collectivis...

Documenting trends in young people's self-reported traits and attitudes is empirical research, not a complaint or a stereotype. Rising cultural individualism has both good consequences (more gender equality) and more negative ones (narcissism, mental health issues). Arnett seems to believe we should embrace studies of cultural change only if they f...

According to the empirical evidence, today's emerging adults (Millennials/GenY, born after 1980) are more Generation Me than Generation We when compared to previous generations. Five data sets show a generational increase in narcissism, including one that demonstrates significant increases when a confound is controlled. College and child samples in...

Today’s young generation (often called Millennials, GenY, or Generation Me) are the first to grow up with the Internet and social networking websites. Have these experiences led to more and better social connections, or fewer and atrophied ones? Social media use may lead to online political action such as signing an e-mail petition but does not app...

The status of women in the United States varied considerably during the 20th century, with increases 1900–1945, decreases 1946–1967, and considerable increases after 1968. We examined whether changes in written language, especially the ratio of male to female pronouns, reflected these trends in status in the full text of nearly 1.2 million U.S. boo...

Compared to previous generations, more American college students now rate themselves as above average on attributes such as academic ability, drive to achieve, leadership ability, public speaking ability, self-confidence, and writing ability (based on a nationally representative sample collected 1966–2009; N = 6.5 million). These birth cohort diffe...

Millions of people use social networking sites (SNSs), but it is unclear how these sites shape personality traits and identity. In Experiment 1, college students were randomly assigned to either edit their MySpace page or complete a control task online (interacting with Google Maps). Those who focused on their MySpace page scored significantly high...

Cultural products such as song lyrics, television shows, and books reveal cultural differences, including cultural change over time. Two studies examine changes in the use of individualistic words (Study 1) and phrases (Study 2) in the Google Books Ngram corpus of millions of books in American English. Current samples from the general population ge...

Three studies examined generational differences in life goals, concern for others, and civic orientation among American high school seniors (Monitoring the Future; N = 463,753, 1976-2008) and entering college students (The American Freshman; N = 8.7 million, 1966-2009). Compared to Baby Boomers (born 1946-1961) at the same age, GenX'ers (born 1962-...

Correlational research has shown that lower social standing is associated with poorer health, but it is unknown if this association is causal. Two experiments tested whether randomly assigned low subjective social status would promote ruminative coping, a mechanism leading to the development of poor health outcomes. Participants were college female...

Almost all of the available evidence suggests a sharp rise in anxiety, depression, and mental health issues among Western youth between the early 20th century and the early 1990s. Between the early 1990s and the present, more serious problems such as suicide and depression have receded in some data sets, whereas feeling overwhelmed and reporting ps...

Nine experiments tested competing hypotheses regarding nonconscious affective responses to acute social exclusion and how such responses may relate to positive mental health. The results strongly and consistently indicated that acute social exclusion increased nonconscious positive affect. Compared to nonexcluded participants, excluded participants...

American culture is filled with cultural products. Yet few studies have investigated how changes in cultural products correspond to changes in psychological traits and emotions. The current research fills this gap by testing the hypothesis that one cultural product—word use in popular song lyrics—changes over time in harmony with cultural changes i...

Three meta-analyses find increases over the generations in Rosenberg Self-Esteem scale (RSE) scores between 1988 and 2008 among American middle school ( d = 0.78, n = 10,119), high school ( d = 0.39, n = 16,669), and college students ( d = 0.30, n = 28,918). The changes are consistent with an increasing emphasis on self-worth in American culture...

PurposeThis article reviews the evidence for generational differences in work values from time-lag studies (which can separate generation from age/career stage) and cross-sectional studies (which cannot). Understanding generational shifts is especially important given the coming retirement of Baby Boomer workers and their replacement by those born...