Short assessment of the Big Five: robust across survey methods except telephone interviewing

Cognitive flexibility moderates the relationship between openness-to-experience and perceptual reversals of Necker cube

It is not clear whether personality is related to basic perceptual processes at the level of automatic bottom-up processes or controlled top-down processes. Two experiments examined how personality influences perceptual dynamics, focusing on how cognitive flexibility moderates the relationship between personality and perceptual reversals of the Necker cube. The participants viewed stimuli either passively or with the intent to either hold or switch the orientation of the Necker cube. The influence of openness was predominantly evident in conditions necessitating intentional control over perceptual reversals. The link between openness and intentional perceptual reversals was always moderated by cognitive flexibility, which was measured in three different ways. No relationship was detected between personality traits and reversals in the passive viewing condition, suggesting that relatively spontaneous adaptation-inhibition processes may not be personality-dependent. Overall, our research sheds light on the nuanced influence of personality traits on perceptual experiences, mediated by cognitive flexibility.

Cognitive behavioural therapy for insomnia (CBT-I) in schizophrenia and schizoaffective disorder: protocol for a randomised controlled trial

INTRODUCTION

Insomnia is a common symptom among patients with schizophrenia and schizoaffective disorder, negatively impacting symptom severity, functioning and well-being; however, it is rarely the direct focus of treatment. The main recommended treatment for insomnia is cognitive behavioural therapy (CBT-I). There is some evidence that CBT-I can also be used to treat insomnia in patients with schizophrenia, but only a few randomised controlled trials (RCTs) have been published. The aim of this ongoing RCT is to determine whether we can alleviate symptoms of insomnia and improve the quality of life in patients with schizophrenia and schizoaffective disorder through CBT-I delivered via the internet or in a group mode.

METHODS AND ANALYSES

The aim of this study is to recruit 84-120 outpatients from the Psychosis Clinics of Helsinki University Hospital and the City of Helsinki Health Services. The main inclusion criteria are a diagnosis of schizophrenia or schizoaffective disorder and self-reported sleep problems. The study will be performed on a cyclic basis, with a target of 12-24 patients per cycle. Participants are randomly assigned into three groups: (1) a group receiving only treatment as usual (TAU), (2) internet-based individual therapy for insomnia (iCBT-I)+TAU or (3) group therapy for insomnia (GCBT-I) conducted via a virtual platform+TAU. The primary outcome measures are quantitative changes in the Insomnia Severity Index score and/or changes in health-related quality of life using the 15D quality of life measure. Secondary outcomes include self-reported variables for sleep, health, stress and the severity of psychotic and depressive symptoms; objective outcomes include actigraphy and bed sensor data to evaluate circadian rhythms and motor activity. Outcome measures are assessed at baseline and after the treatment period at weeks 12, 24 and 36.

ETHICS AND DISSEMINATION

The Coordinating Ethics Committee of the Hospital District of Helsinki and Uusimaa, Finland, approved the study protocol. The results will be published in peer-reviewed journals.

TRIAL REGISTRATION NUMBER

NCT04144231.

Evaluating a Brief Big Five Personality Test in a Diverse Chinese Sample: The Role of Midpoint Designs and Reversely-Worded Items

Response styles present a threat to the validity of data from Likert scales. This study evaluates a brief personality test administered by interviewers to a diverse Chinese sample, focusing on two factors with direct impacts on response styles, the midpoint designs and the inclusion of reversely-worded items. We randomly assign respondents into three midpoint designs: masked midpoint, explicit midpoint and removed midpoint. Cronbach's alpha tends to be low and is not drastically affected by midpoint designs. Score reliability estimates from the removed and explicit midpoint designs are above or close to .60 along the whole score range for openness, but not the other subscales. The masked midpoint design presents some advantages in criterion relationship validity evidence based on correlations with demographic, behavioral, subjective and cognitive variables. Dropping reversely-worded items increases the estimates of Cronbach's alpha, but shows no positive effects on the criterion relationship validity. In conclusion, for interviewer-administered brief personality scales applied to Chinese respondents, masked midpoint design that aims to reduce a possible overuse of midpoint presents some advantages in the overall psychometric properties, but the inclusion of reversely-worded items shows mixed effects.

Pet attachment and owner personality

Introduction

Research points to a relationship between owner personality and strength of attachment to one's pet, with implications for psychological health. So far, studies in this area, albeit sparse, have focused on the 'Big Five' traits of owner personality. The 'Dark Triad' is a cluster of traits that has also been linked to emotional deficits, but has been overlooked in relation to pet attachment. This study therefore examined the association between owner personality and pet attachment, focusing on both the 'Big Five' and 'Dark Triad' traits of personality.

Methods

A cross-sectional design was employed to collect quantitative data from dog and cat owners across the globe between May-June 2023. A purpose-designed online survey collected sociodemographic details, along with information on pet ownership, strength of the pet-owner bond and participant personality, assessed using the Big Five personality scale and the Short Dark Triad scale. The survey was fully completed by 759 dog and 179 cat owners.

Results

Analysis revealed significant correlations between many of the participants' personality traits, both within and between scales. Strength of pet attachment was positively correlated with neuroticism and conscientiousness, and, more weakly, to Machiavellianism. Regression analysis revealed that females, dog owners, people over the age of 50 and individuals who had children under 18 years to care for were more strongly attached to their pets than others. Both neuroticism and conscientiousness were found to be significant predictors of participants' pet attachment scores. None of the Dark Triad traits significantly predicted the criterion.

Discussion

This study points to a relationship between strength of attachment to one's pet and owner personality, at least as measured using the Big Five approach to personality assessment. There was little to support an association between the Dark Triad traits and strength of attachment to one's pet, although the link between these characteristics and attachment styles is still unknown. The investigation lends support for the idea that high attachment levels are associated with personality traits aligned to psychological ill-health. Further work is recommended in this area, with a greater focus on both strength and quality (e.g., attachment style) of the pet-owner bond.

Why Should Diabetic Women Be Active?-The Role of Personality, Self-Esteem, Body-Esteem, and Imagery

Diabetes is one of the fastest spreading diseases in the 21st century. The aim of the study is twofold: (1) to find differences in personality traits, self-esteem, body-esteem, and imagery between healthy women and women with diabetes; (2) to verify whether there are differences in the analyzed factors among women with diabetes who engage in sports compared to those who do not. We used 3 questionnaires: Imagination in Sport-short form, Self-Esteem Scale (SES), and BFIS Personality, which were tested online. We found that women with diabetes were characterized by significantly higher neuroticism, lower extraversion, and higher conscientiousness (marginally significant). We also found that women with diabetes who practice sport rated their bodies more highly in terms of sexual attractiveness and made better use of imagined affirmations than women without diabetes who were not active. Our study provides new insights into diabetics in terms of women navigating the disease.

Shorter Goals for the Faster Life: Childhood Unpredictability Is Associated With Shorter Motivational Time Horizons

Models of adaptive calibration provide an overarching theoretical framework for understanding the developmental roots of psychological and behavioral outcomes in adulthood. An adaptive calibration framework was used to examine an important dimension of motivation: goal timing. Across two studies, we saw mixed support for the hypothesis that unpredictability experienced in childhood would be negatively associated with the time horizons people use to set their goals, such that people who reported experiencing more unpredictability in their childhood tended to set goals on relatively shorter time horizons. The association was observed based on independent ratings of goal timing, but not based on participants' self-reported ratings of goal timing, and was statistically mediated by people's tendency to consider the short- versus long-term future consequences of their actions. These studies isolate a key component of childhood adversity-unpredictability-potentially underlying the time horizons people use to set, prioritize, and pursue their goals.

Meta-analysis of personality trait differences between omnivores, vegetarians, and vegans

Vegetarian and vegan diets have been increasing in the Western world. Recent research has focused on personality trait differences between dietary groups, in part because personality traits are broad characteristics that can integrate findings about different factors that motivate vegetarian or vegan diets. Previous research on personality predictors of vegetarian and vegan (veg*n) diet, however, has yielded inconsistent results. The goal of this study was to integrate the existing results of Big Five personality differences between veg*ns and omnivores as well as between vegetarians and vegans. To this end, we meta-analyzed data from 15 studies and N = 69,576 individuals from several countries. Results indicated that veg*ns were significantly higher in Openness (d = 0.40) and Agreeableness (d = 0.17) than omnivores, while vegans were significantly higher in Openness (d = 0.14) than vegetarians. This work isolates Openness and Agreeableness as important trait predictors of plant-based diets and sets the stage for future work on the factors that motivate vegetarian or vegan diet. Personality traits can provide an integrative framework for conceptualizing dietary preferences, be used to make predictions about the sources, course and correlates of dietary choices, and potentially be useful for advocates and policymakers seeking to tailor meat-reduction interventions.

The positive-negative-competence (PNC) model of psychological responses to representations of robots

Robots are becoming an increasingly prominent part of society. Despite their growing importance, there exists no overarching model that synthesizes people's psychological reactions to robots and identifies what factors shape them. To address this, we created a taxonomy of affective, cognitive and behavioural processes in response to a comprehensive stimulus sample depicting robots from 28 domains of human activity (for example, education, hospitality and industry) and examined its individual difference predictors. Across seven studies that tested 9,274 UK and US participants recruited via online panels, we used a data-driven approach combining qualitative and quantitative techniques to develop the positive-negative-competence model, which categorizes all psychological processes in response to the stimulus sample into three dimensions: positive, negative and competence-related. We also established the main individual difference predictors of these dimensions and examined the mechanisms for each predictor. Overall, this research provides an in-depth understanding of psychological functioning regarding representations of robots.

Emotional responses to favorite and relaxing music predict music-induced hypoalgesia

Introduction

The hypoalgesic effect of music has long been established. However, the characteristics of music which are important for reducing pain have not been well-studied. Some research has compared subject-selected preferred music to unfamiliar music selected by researchers, and has typically found a superior effect from preferred music. In this study, we sought to discover what aspects of listeners' relationship with their preferred music was important in producing a hypoalgesic effect.

Methods

We conducted a thermal pain and music listening experiment with 63 participants (14 male, 49 female, mean age = 21.3), in which music excerpts were paired with thermal stimulations. Pain ratings of intensity and unpleasantness, as well as emotional response variables, were rated on visual analog scales. We also conducted brief structured interviews about participants' favorite music, on which we conducted thematic content analysis. Themes and emotion variables were analyzed for their effects on pain ratings.

Results

We first replicated the finding that favorite music outperforms experimenter-selected relaxing music in reducing pain unpleasantness (MD = -7.25, p < 0.001) and that the difference in hypoalgesia was partially mediated by an increase in musical chills (ab = -2.83, p < 0.01). We then conducted a theme analysis on the interview transcripts and produced four themes relating to emotional experience: moving/bittersweet, calming/relaxing, happy/cheerful, and energizing/activating. We found suggestive evidence that moving/bittersweet favorite music reduces pain unpleasantness through increased music pleasantness (ab = -5.48, p < 0.001) and more musical chills (ab = -0.57, p = 0.004).

Discussion

We find that music pleasantness and musical chills are salient predictors of music-induced hypoalgesia, and that different categories of favorite music derived from qualitative analysis may engage these emotional pathways to different degrees.

The structure of human motivation

BACKGROUND

A unified model of human motivation has been recently introduced that integrates all prior "mini-theories" of motivation into a single, symmetrical model based on first principles: four life domains crossed by three levels of attainment, resulting in 12 discrete motivations. Evidence from a series of studies using a novel image-based method is used to test structural hypotheses derived from a unified model of human motivation.

METHOD

The studies employ large samples (810n to 986n) of working adults who conducted a time-constrained image-based exercise to measure the relative presence or absence of different emotional needs.

RESULTS

These studies provide support for the theoretical model, suggesting that there is substantial heuristic and practical value in a structured framework of motivating needs.

CONCLUSIONS

Findings suggest that our theoretical model reflects deep interrelationships between discrete types of human motivation, and by linking specific measures to a comprehensive model of human motivation, researchers can have confidence that they have adequately measured the motivation construct.

Validation of the English version of the Autism-Spectrum Quotient in an English-speaking Singaporean sample

The Autism-Spectrum Quotient (AQ) measures the degree of autistic traits in clinical and non-clinical samples and has been validated in various countries and languages. However, the AQ has not been validated in Singapore, an Asian country whose population speaks predominantly English. Although previous validation studies have examined the distribution of scores, internal consistency, test-retest reliability and construct, convergent and discriminant validities in Asian countries using translated versions of the AQ and generally shown a suitable structure of the AQ, other studies testing cultural differences of the AQ have provided inconsistent results about whether differences exist in scores between Western and Asian samples. Additionally, while prior literature has consistently documented sex differences in AQ scores, findings about the relationship between personality traits and friendship quality with autistic traits have been mixed. The aim of the current study was to validate the psychometric properties of the original English AQ in a non-clinical Singaporean sample and compare their mean AQ scores to previous Western samples. In this study, psychometric properties of the original English AQ were assessed in 113 Singaporean adults (47M/66F; Mean age = 37.78; SD = 14.52) with no clinical diagnoses. They completed the AQ, the Friendship Questionnaire (FQ) and the short Big Five Inventory, with a subsample completing the AQ twice within three to six months. Results showed that AQ scores were normally distributed and the AQ had satisfactory internal consistency and test-retest reliability and it demonstrated construct, convergent and discriminant validities. Higher AQ scores were related to lower friendship quality and extraversion and higher neuroticism. The mean AQ scores of the Singaporean sample did not differ to that reported in original British sample. Together, present findings showed the original English AQ to be reliable for measuring the degree of autistic traits in a non-clinical Singaporean sample, producing comparable AQ scores and showing the same relationships to other social and personality measures and the same sex differences as has been reported in English samples. This supports the use of the AQ in Singapore for clinical and research purposes and suggests that the measurement of autistic traits in some Asian cultures is comparable to that reported in Western cultures.

Personality traits and health care use: A coordinated analysis of 15 international samples

Some people use health care services more than others. Identifying factors associated with health care use has the potential to improve the effectiveness, efficiency, and equity of health care. In line with the Andersen behavioral model of health care utilization and initial empirical findings, personality traits may be key predisposing factors associated with health care use. Across 15 samples, the present study examined cross-sectional and prospective associations between Big Five personality traits and the likelihood of dental visits, general medical practitioner visits, and hospitalizations. Using coordinated data analysis, we estimated models within each of 15 samples individually (sample Ns ranged from 516 to 305,762), and then calculated weighted mean effect sizes using random-effects meta-analysis across samples (total N = 358,803). According to the synthesized results, people higher in conscientiousness, agreeableness, extraversion, and openness, and lower in neuroticism were more likely to visit the dentist; people higher in neuroticism were more likely to visit general medical practitioners; and people lower in conscientiousness and agreeableness and higher in neuroticism were more likely to be hospitalized. Associations tended to be small with odds ratios around 1.20 (rs ≈ .05). These findings provide evidence across 15 international samples for small but consistent associations between personality traits and health care use and demonstrate that personality-health care associations differ by type of care. We discuss directions for future research, including examining more specific personality facets (e.g., productiveness vs. responsibility) as well as important dimensions of health care (e.g., preventative vs. reactive care; acute vs. chronic care). (PsycInfo Database Record (c) 2023 APA, all rights reserved).

A Realistic Evaluation of Methods for Handling Missing Data When There is a Mixture of MCAR, MAR, and MNAR Mechanisms in the Same Dataset

The impact of missing data on statistical inference varies depending on several factors such as the proportion of missingness, missing-data mechanism, and method employed to handle missing values. While these topics have been extensively studied, most recommendations have been made assuming that all missing values are from the same missing-data mechanism. In reality, it is very likely that a mixture of missing-data mechanisms is responsible for missing values in a dataset and even within the same pattern of missingness. Although a mixture of missing-data mechanisms and causes within a dataset is a likely scenario, the performance of popular missing-data methods under these circumstances is unknown. This study provides a realistic evaluation of methods for handling missing data in this setting using Monte Carlo simulation in the context of regression. This study also seeks to identify acceptable proportions of missing values that violate the missing-data mechanism assumed by the method used to handle missing values. Results indicate that multiple imputation (MI) performs better than other principled or ad-hoc methods. Different missing-data methods are also compared via the analysis of a real dataset in which mixtures of missingness mechanisms are created. Recommendations are provided for the use of different methods in practice.

Trust and vaccine hesitancy during the COVID-19 pandemic: A cross-national analysis

Previous studies of vaccine hesitancy in the context of COVID-19 have reported mixed results in terms of the role played by political and institutional trust. This study addresses this ambiguity with a global analysis of the relationship between trust and vaccine hesitancy, disentangling the effects of generalized trust orientations, trust in specific institutions and conspiracy mentality. It first draws upon a cross-national survey of 113 countries to demonstrate that trust in government is a predictor of vaccine hesitancy across global regions. It further draws on original surveys fielded in seven countries (France, Germany, Spain, Argentina, Croatia, Brazil, India), which deploy a diverse range of measures, to disentangle the individual-level predictors of vaccine hesitancy. Our findings confirm the robust effects of trust in government across countries, but when including other trust measures in the same models, the most robust effects are those of trust in health institutions and conspiracy mentality. Weaker associations are observed for right-wing ideology and online political engagement, while the consumption of traditional media tends to predict the willingness of individuals to be vaccinated.

A Comparison of Social Exclusion Towards People with Depression or Chronic Back Pain

Objectives

Research comparing mental and physical health stigma is scarce. The aim of this study was to compare social exclusion towards hypothetical males and females with depression or chronic back pain. Furthermore, the study investigated whether social exclusion is associated with participant's empathy and personality traits, while controlling for their sex, age and personal exposure to mental/physical chronic health conditions.

Design

This study employed a cross-sectional questionnaire design.

Methods

Participants (N = 253) completed an online vignette-based questionnaire and were randomly allocated to either a depression or chronic back pain study condition. Measures of social exclusion through respondents' willingness to interact with hypothetical individuals, empathy and the Big Five personality traits were completed.

Results

Willingness to interact scores did not significantly differ depending on the diagnosis or sex of the hypothetical person in the vignette. For depression, higher levels of conscientiousness significantly predicted less willingness to interact. Whilst being a female participant and having higher empathy significantly predicted greater willingness to interact. For chronic back pain, higher empathy significantly predicted greater willingness to interact, with no significant predictors found from the Big Five personality traits.

Conclusion

Findings indicate that females and males with depression or chronic back pain face similar levels of social exclusion, with empathy being a core variable driving social exclusion behaviours. These findings enhance our understanding of potential variables driving social exclusion, in-turn informing campaign development to reduce public stigma towards depression and chronic back pain.

Associations between Personality Traits and Areas of Job Satisfaction: Pay, Work Itself, Security, and Hours Worked

Although studies have widely explored the connections between personality traits and job satisfaction, less is known about how personality relates to aspects of job satisfaction. The objective of this study was to explore the relationships between personality traits and various areas of job satisfaction, including pay, work, security, and hours worked. This study used ordinal regressions to analyze data from 6962 working individuals from the British Household Panel Survey (BHPS). The results showed that Neuroticism consistently has a negative association with all aspects of job satisfaction, whereas Agreeableness and Conscientiousness have positive associations with job satisfaction. Extraversion had a weak negative association with satisfaction with total pay. These findings imply that personality may play a crucial role in shaping areas of job satisfaction.

Personality traits and dimensions of mental health

Individuals are different in a relatively constant pattern of thoughts, feeling, and behaviors, which are called personality traits. Mental health is a condition of well-being in which people may reach their full potential and deal effectively with stress, work efficiently, and contribute to their communities. Indeed, the link between personality and mental health as indicated by the 12-item version of the general health questionnaires (GHQ-12) has been well-established according to evidence found by decades of research. However, the GHQ-12 comprises many questions asking about different dimensions of mental health. It is unclear how personality traits relate to these dimensions of mental health. In this paper, we try to address this question. We analyzed data from 12,007 participants from the British Household Panel Study (BHPS) using a confirmatory factor analysis (CFA) and generalized linear models. We replicated the factor structure of GHQ-12 labeled as GHQ-12A (social dysfunction & anhedonia; 6 items), GHQ-12B (depression & anxiety; 4 items), and GHQ-12C (loss of confidence; 2 items). Moreover, Neuroticism was positively related to all dimensions of mental health issues, Extraversion was negatively related to GHQ-12A (social dysfunction & anhedonia) and GHQ-12B (depression & anxiety), Agreeableness and Conscientiousness were negatively related to GHQ-12A (social dysfunction & anhedonia) and GHQ-12C (loss of confidence), and Openness was negatively related to GHQ-12B (depression & anxiety). These results contribute to theories including the predisposition/vulnerability model, complication/scar model, pathoplasty/exacerbation model, and the spectrum model, which propose that personality traits are linked to mental health and explained possible reasons. Psychologists may use results from this study to identify individuals who may be at high risk of developing various non-psychiatric mental health issues and intervene to avoid negative outcomes.

Longitudinal bidirectional associations between personality and becoming a leader

OBJECTIVE

Leaders differ in their personalities from non-leaders. However, when do these differences emerge? Are leaders "born to be leaders" or does their personality change in preparation for a leadership role and due to increasing leadership experience?

METHOD

Using data from the German Socio-Economic Panel Study, we examined personality differences between leaders (N = 2683 leaders, women: n = 967; 36.04%) and non-leaders (N = 33,663) as well as personality changes before and after becoming a leader.

RESULTS

Already in the years before starting a leadership position, leaders-to-be were more extraverted, open, emotionally stable, conscientious, and willing to take risks, felt to have greater control, and trusted others more than non-leaders. Moreover, personality changed in emergent leaders: While approaching a leadership position, leaders-to-be (especially men) became gradually more extraverted, open, and willing to take risks and felt to have more control over their life. After becoming a leader, they became less extraverted, less willing to take risks, and less conscientious but gained self-esteem.

CONCLUSIONS

Our findings suggest that people are not simply "born to be leaders" but that their personalities change considerably in preparation for a leadership role and due to leadership experience. Some changes are transient, but others last for a long time.

Do entry year pharmacy students have similar personal characteristics? Comparing personalities, professional goals, and role perceptions

BACKGROUND

Schools and faculties of pharmacy are responsible for selecting students to admit into the profession. Despite many similarities, admission processes, pharmacists' training, and scope of practice are different across jurisdictions. Students that are selected for admission may then differ in a number of ways, including by personality traits and other individual difference measures.

OBJECTIVE

To compare the trait characteristics between students entering a New Zealand (NZ-University of Otago) and Canadian ((University of Waterloo) pharmacy programme and to compare their professional goals and role perceptions.

METHODS

Incoming first year students at each university were invited to take an online questionnaire that included personality characteristics and potential predictors of involvement in pharmacists' roles: (1) the Big Five Inventory (openness, conscientiousness, extraversion, agreeableness, neuroticism); (2) the Achievement Goals Questionnaire-Revised; (3) the Rational Experiential Inventory; and (4) Counsellor Role Orientation. Statistical tests were conducted to determine if there were differences between entry level pharmacy students from NZ and Canada.

RESULTS

184 students (97/150 Otago, 87/118 Waterloo) completed the survey. On average, Waterloo students scored higher on agreeableness (M = 80 vs. 76, p = 0.06), conscientiousness (M = 70 vs. 68, p = 0.30), mastery-approach (M = 93 vs.90, p = 0.06), and faith-in-intuition (M = 67 vs. 61, p = 0.03) compared to Otago pharmacy students who were higher for openness M = 70 vs. 66, p = 0.09). An item measuring reliance on physicians for medicine advice was endorsed more by Otago pharmacy students (M = 35 vs. M = 15, p < 0.001). Items on time pressure (e.g., "It takes too much time to for a pharmacist to talk with a patient about the medication they receive") were higher for Otago students (M = 41 vs. M = 38, p = 0.26). Higher scores for pharmacist restriction ("There should be legal restrictions on what pharmacists can tell patients") were also seen among Otago students (M = 26 vs. M = 12, p < 0.001). There were important differences between entry level pharmacy students and practicing pharmacists in both jurisdictions.

DISCUSSION

While entry-level pharmacy students had similar personality profiles, differences were observed in role expectations and in experiential learning orientation. This highlights differing societal views on the role of pharmacists in each respective country. Pharmacy schools should study their student bodies when designing their curricula and electives, helping ensure graduates feel like they have the training to do what they need to do. Future work will determine if these personality and learning goals influence students' preparation for practice.

Interdependencies Between Family and Friends in Daily Life: Personality Differences and Associations with Affective Well-Being Across the Lifespan

Family and friends are central to human life and well-being. Yet, interdependencies between family and friends have scarcely been examined. How is the relative frequency of daily contact with family and friends (i.e., the friends/family-ratio) related to personality and to well-being? In an experience sampling study with 396 participants (M age= 40 years, range 14-88 years, 52% females), we studied how the friends/family-ratio in contact differed along Big Five personality trait scores and was connected to affective well-being across six daily measurements on nine days (average of 55 assessments). Most participants reported more daily contact with family than friends (i.e. they held a family orientation), but individual differences were substantial. More agreeable individuals reported a greater family orientation. More extraverted individuals reported more positive affect in the company of friends than with family. Age moderated the effect of the friends/family-ratio on positive affect. Younger adults reported less positive affect in the company of family, yet older adults reported more positive affect in the company of family, the more they were friendship oriented. We discuss how examining the friends/family-ratio extends previous knowledge on personality differences in social relationships, and how the friends/family-ratio yields promising, yet challenging, future directions in personality-relationship associations.

Memory, Attention, and Concentration Dysfunction Post-COVID-19 Among College Students in Saudi Arabia: A Case-Control Study

Introduction Multiple studies have demonstrated the multi-systemic involvement of COVID-19, and among all of these systems, there is mounting evidence that COVID-19 is linked to neurocognitive impairment, particularly when neurological symptoms are present. Our aim is to study the concept of cognitive dysfunction post-COVID-19 among college students in Saudi Arabia and its potential effect on their academic performance.  Methods A population-based, observational case-control study was conducted across the Kingdom of Saudi Arabia, from May 2022 to September 2022. A total of 2,150 eligible students have completed the study questionnaire. An exact 776 (36.1%) of them had COVID-19 infection (group 1), while 1,374 (63.9%) students had not (group 2). The sample population was college-enrolled students from 18 to 28 years old, with a mean age of 21.3 for group 1 and 20.8 for group 2. Both groups were handed the same data collection tool to establish whether the COVID-19 survivors had cognitive deficits more than the control group. Results There was no significant difference between the two groups regarding their bio-demographic data, study methods, or vaccination rate. However, both Neurological Fatigue and Big Five Inventory score were significantly higher among infected students, comparable to non-infected students. A negative relation was found between the infected students' neurological fatigue (rho=-0.14), cognitive failure (rho=-0.10), and depression and anxiety scale with their GPA (rho=0.03). Contrarily, infected students showed a positive relationship between their GPA and the Big Five Inventory (rho=0.13) and Short Grit Scale (rho=0.14). Also, there was a significant inverse relation between students' apathy motivation with their Big Five Inventory. Likewise, there was an inverse relation between their neurological fatigue, cognitive failure, and apathy motivation with their Short Grit Scale. Conclusion We demonstrated that college students who have survived COVID-19 infection mostly complain of cognitive impairment, even though most of them have no comorbidities or psychological disorders.

Exploring the influence of personal factors on physiological responses to mental imagery in sport

Imagery is a well-known technique in mental training which improves performance efficiency and influences physiological arousal. One of the biomarkers indicating the amount of physiological arousal is skin conductance level (SCL). The aim of our study is to understand how individual differences in personality (e.g. neuroticism), general imagery and situational sport anxiety are linked to arousal measuring with SCL in situational imagery. Thirty participants aged between 14 and 42 years (M = 22.93; SD = 5.24), with sport experience ranging between 2 and 20 years (M = 10.15; SD = 4.75), took part in our study. Participants listened to each previously recorded script and then were asked to imagine the scene for a minute. During the task SCL was monitored using the Biofeedback Expert 2000. Machine learning predictive models based on artificial neural networks have been trained for prediction of physiological response, as a function of selected psychological tests. We found an association among neuroticism, prestart anxiety, and general tendency to use imagery with SCL. From a practical point of view our results may help athletes, coaches, and psychologists to be more aware of the role of individual differences in sport.

Childhood adversity and educational attainment: Evidence from Zambia on the role of personality

Introduction

We examine whether personality traits mediate the association between childhood adversity and educational attainment using longitudinal data from a cohort in Zambia.

Methods

We fit a structural equation model using data on three forms of childhood adversity-household poverty, stunting as a measure of chronic malnutrition, and death of a parent-and data on the "Big Five" personality traits and educational attainment assessed at 15 years of age.

Results

We find that childhood poverty and death of a parent are associated with lower openness to experience. Furthermore, openness to experience mediates 93% of the negative association between death of a parent and school enrollment and 19% of the negative association between childhood poverty and enrollment.

Discussion

Our findings reinforce a diverse and growing body of evidence linking childhood adversity to educational attainment while also placing it in a new light. Future work should continue to examine the biological and psychosocial pathways that determine openness to experience and other personality traits, as well as their role in shaping important life outcomes.

No general pathological significance of aphantasia: An evaluation based on criteria for mental disorders

As awareness of the phenomenon of aphantasia (= lack of voluntary imagery) has increased in recent years, many psychotherapists ponder its clinical implications. The present study investigates whether aphantasia meets the criteria for mental disorders, i.e. statistical rarity, impairment in activities of daily living, violation of social norms and inappropriate behavior and personal distress. Prevalence of aphantasia was determined meta-analytically based on 3,543 participants. An international sample of 156 participants with aphantasia (58.3% male; M_age  = 35.23) and 131 controls (65.6% male; M_age  = 28.88) was assessed with the Reading the Mind in the Eyes Test, the Questionnaire for the Assessment of Everyday Memory Performance and the Aphantasia Distress Questionnaire, as well as measures of depression, anxiety and well-being. The prevalence of aphantasia was estimated at 3.5 to 4.8%. Participants with aphantasia scored significantly lower than controls on every day and autobiographical memory, but not on theory of mind. A subgroup of 34.7% of participants with aphantasia reported distress significantly associated with lower well-being and high levels of anxiety and depression. The level of distress increased with poorer performance in autobiographical memory and theory of mind. Although aphantasia meets the criterion of statistical rarity, the impact on activities of daily living and personal distress is too weak to justify a classification as a mental disorder. In a subgroup, however, distress can reach clinically relevant levels. In individual cases, it is therefore advisable to conduct a psychological assessment, for example by means of the Aphantasia Distress Questionnaire.

In the Heat of the Short-Term Moment: Evidence that Heightened Sexual Arousal Increases Short-Term Mating Motivation Among Men

Individual differences in men’s short-term mating interest are well studied, both at state and trait levels. Yet, the role of sexual arousal as a source of intra-individual variation has been neglected. This research represents the first attempt to integrate sexual arousal into the human mate plasticity literature. We argue that sexual arousal directly impacts the short-term mating motivation among men regardless of their personality, relationship status, and sociosexuality. Across four experiments, we found that heightened sexual arousal consistently increased men’s short-term mating motivation relative to participants in neutral and arousing control groups. Experiments 1 and 2 revealed that sexual arousal increased participants’ general short-term mating motivation and their preference for a short-term relationship over a long-term one. Experiment 3 replicated the findings of the first two experiments whilst also demonstrating that this effect was not moderated by personality (i.e., Dark Triad, Big Five) or relationship status. Heightened sexual arousal also led to decreased “state” long-term mating motivation. Finally, Experiment 4 showed that sexual arousal increased the participants’ preference for a short-term relationship over a long-term one, an effect that was not moderated by sociosexuality. Together, the results suggest that sexual arousal has a powerful effect on men’s short-term mating motivation, and that this effect is independent of intrasexual differences in personality, relationship status, and sociosexuality.

A motivational approach to perfectionism and striving for excellence: Development of a new continuum-based scale for post-secondary students

Perfectionism has been the object of many disputes. One such debate pertains to the nature of perfectionistic strivings. Whereas perfectionistic concerns (PC) have been shown to correlate with negative outcomes, perfectionistic strivings (PS) have been associated with mixed outcomes. This view of perfectionism assumes a motivational perspective; however, commonly used questionnaires assess motivation only implicitly. To create a more explicit measure of motivation as regard perfectionism, we aimed to assess perfectionism in post-secondary education based on Deci and Ryan’s self-determination continuum. We posit that introjected motivation represents the variance common to both dimensions of perfectionism. External motivation is considered to be specific to PC and identified motivation to PS. Amotivation represents a lack of meaningful striving. Intrinsic motivation, lacking perfectionism’s pressure, is conceptualized to be a self-determined form of striving for excellence. We further posited that this continuum is implicitly underlain by a continuum of self-definition as defined by Blatt. The resulting questionnaire showed an adequate structure with ESEM, followed a simplex structure, and had adequate reliabilities (Study 1a/Study 2). It also showed adequate convergent validity (Study 1b/Study 2). Finally, the questionnaire proved to be invariant over a 6-week period (Study 2). Results suggest that the degree of active goal pursuit, in addition to standards setting, could be a distinguishing characteristic between dimensions of perfectionism as well as striving for excellence.

The Relationship between Personality Traits and Compliance with the COVID-19 Preventive Measures in Kosovo

The COVID-19 pandemic urged systematic restrictive measures in order to avoid the spread of the virus. Different countries applied different restrictive measures; however, their efficacy was vastly dependent on the willingness of the people to comply with them. How people perceived the pandemic yielded different adaptive behavior to preventative measures. In this direction, individual characteristics (i.e., personality) seem very important. The current study aimed to map a relationship between personality structure as postulated within the five-factor model of personality with the tendency to comply with preventive measures, as mediated by perceived stress and concerns over coronavirus. In a sample of 3252 adults, we found that the traits of openness, agreeableness, and conscientiousness directly and positively predicted compliance. However, concerns over coronavirus partially but positively mediated the relationship between agreeableness and conscientiousness on compliance. Perceived stress, on the other hand, was not a significant mediator, although it was significantly and positively predicted by neuroticism but negatively by extraversion. These findings showed that different personality traits have different direct effects on compliance with preventative measures.

Conscientiousness and Cognitive Ability as Predictors of Academic Achievement: Evidence of Synergistic Effects From Integrative Data Analysis

Cognitive ability is the most powerful predictor of academic achievement. However, increasing attention is being paid to the role of personality traits in students’ academic achievement. Results indicate incremental effects beyond cognitive ability, especially for conscientiousness. Investigating the interplay of conscientiousness and cognitive ability can increase understanding of students’ academic achievement and learning. This study examined whether there are interaction effects of a synergistic or compensatory nature. We applied the approach of integrative data analysis, using four highly powered data sets with a total of 18,637 upper secondary school students in Germany to investigate this research question across four different achievement measures and three educational domains (i.e., school subjects). We used an integrative approach and pooled the results across the four samples to obtain an average estimate of the hypothesized interaction effects. Findings support a small synergistic interaction, indicating that conscientiousness moderates the association between cognitive ability and achievement. This means conscientiousness can enhance the positive effects of cognitive ability. In conclusion, results highlight the role of the type of academic measure used and the domain investigated in understanding how personality and achievement are related, providing evidence of the interplay between effort-related traits such as conscientiousness and cognitive ability.

Resilient entrepreneurs? - revisiting the relationship between the Big Five and self-employment

The Big Five personality traits and their influence on entrepreneurial action have been repeatedly studied using a trait-based approach. The present paper partly deviates from this perspective by analysing the role of personality prototypes in relation to entrepreneurship. This person-centred approach suggests that combinations of Big Five traits form individual personalities. By using data from the German Socio-Economic Panel (SOEP), we show that at least three prototypes can be identified, one of which - the resilient type - can be hypothesized to significantly increase the likelihood of entrepreneurial action. Our regression results provide evidence of a positive impact of this prototype on the likelihood of and transitioning into self-employment but not the likelihood of exit. We also show that the prototyping approach explains individual self-employment decisions over and above what can already be explained by the profiling approach, another person-centred Big Five approach. The paper concludes with implications for policy and research.

The Mediating Role of Extra-family Social Relationship Between Personality and Depressive Symptoms Among Chinese Adults

Objectives: This study aims to explore the associations of personality traits and extra-family social relationship with depressive symptoms among Chinese adults.

Methods: A nationally representative sample of 29,810 adults aged 16 and above were selected from 2018 CFPS. Personality and depressive symptoms were measured using CBF-PI-15 and the CES-D8 scale. Extra-family social relationship was assessed through the self-rated evaluation. The multiple regression analysis and the PROCESS macro were used for the mediation analysis.

Results: Extraversion (OR = 0.807, 95% CI = 0.773, 0.842), agreeableness (OR = 0.795, 95% CI = 0.756, 0.835) and extra-family social relationship (OR = 0.927, 95% CI = 0.913, 0.941) had negative associations with depressive symptoms. Extra-family social relationship could mediate between extraversion and depressive symptoms (Indirect effect = −0.049,95% CI = −0.060, −0.039) as well as agreeableness (Indirect effect = −0.056, 95% CI = −0.068, −0.046) and depressive symptoms. Comparing to females, the indirect effect accounts for a higher proportion of total effect in males.

Conclusion: Extra-family social relationship might mediate the association between extraversion and depressive symptoms as well as agreeableness and depressive symptoms.

Revealing Personality Triggers for Media Vicarious Traumatization: A Fuzzy-Set Qualitative Comparative Analysis

People may experience media vicarious traumatization due to frequent exposure to media coverage of disasters. Currently, the influential relationship between personality traits and media vicarious traumatization still lacks systematic and in-depth research. Based on the MU5735 airplane crash, this study explored the effects of configurations of personality traits on media vicarious traumatization by analyzing data from 331 Chinese university students (Mage = 22.63 years, SD = 2.67, range = 18 to 29, n = 186 male and n = 145 female) using Fuzzy-set Qualitative Comparative Analysis (fsQCA). The results revealed that five combinations of the Big Five personality traits could lead to media vicarious traumatization, the combinations of configurations are: (1) high conscientiousness, high agreeableness, and high neuroticism; (2) high conscientiousness, high extraversion, and high agreeableness; (3) high extraversion, high neuroticism, low conscientiousness, and low agreeableness; (4) high openness, high extraversion, high agreeableness, and high neuroticism; (5) high extraversion, high agreeableness, low openness, and low neuroticism. Furthermore, sociodemographic variables (gender, age, and education) interacted with personality traits and also resulted in different configurations of media vicarious traumatization. This study indicates the asymmetric relationships between personality traits and media vicarious traumatization, identifies the vulnerable groups to facilitate targeted trauma interventions for university students according to different configurations, and provides a reference for public psychological relief efforts in emergencies.

Assessing the income-related inequality in obesity among the elderly in China: A decomposition analysis

Background

Obesity among the elderly imposes a significant health and economic burden. The purpose of this study was to measure the obesity prevalence and income-related inequality among older adults in China and to explore the determinants of the inequity.

Methods

Data were obtained from 4,541 older adults (60 years and older) participating in the China Family Panel Study, 2018. Obesity was defined as body mass index (BMI) ≥28 kg/m². Normalized concentration index and concentration curve were calculated to measure the income-related inequality. Decomposition analysis was used to measure the contribution of each factor to the overall unfairness.

Results

The prevalence of obesity among the respondents was 7.99%. The 95% confidence interval for the overall prevalence was 7.20-8.78%. The normalized concentration index of obesity in the elderly was 0.075 (95% confidence interval: 0.047-0.103), indicating that obesity was more concentrated among the rich (p < 0.05). Socioeconomic factors contributed the most to the overall inequality (68.73%). Health behavior factors explained 16.38% of the observed income-related inequality in obesity among the elderly in China.

Conclusions

In 2018, obesity was more concentrated among the elderly with higher incomes in China. The pro-poor income-related inequality was mainly due to the higher socioeconomic status of higher-income older adults. Health behaviors and psychosocial factors could also exacerbate the inequality. To prevent the heavy burden of obesity on the health and finances of older adults, more attention should be paid to those who are financially better off, especially those who smoke and are physically inactive, while extroverted older adults also need to be focused on. For developing countries, concern needs to be given to the obesity of the wealthy elderly as a result of economic development.

Comparison of two different mindfulness interventions among health care students in Finland: a randomised controlled trial

We investigated the short- and long-term effects of two different evidence-based mindfulness training on students' stress and well-being. A randomised controlled trial with three measurement points (baseline, post-intervention, and 4 months post-intervention) was conducted among undergraduate students of medicine, dentistry, psychology, and logopaedics at the University of Helsinki. The participants were randomly assigned into three groups: (1) face-to-face mindfulness training based on the Mindfulness Skills for Students course (n = 40), (2) a web-based Student Compass program using Mindfulness and Acceptance and Commitment therapy (n = 22), and (3) a control group that received mental health support as usual (n = 40). The primary outcome was psychological distress measured using the Clinical Outcomes in Routine Evaluation Outcome Measure (CORE-OM). Secondary outcomes included hair cortisol concentrations and a wide range of well-being indicators. Psychological distress increased in all the groups from baseline to post-intervention, but significantly less so in the intervention groups than in the control group. At 4-month follow-up, were found no differences between the primary outcomes of the control and intervention groups, but the participants who continued practising mindfulness at least twice a week were less stressed than the others. Our results suggest that participating in a mindfulness course may mitigate health care students' psychological distress during the academic year, but only if the participants continue practising mindfulness at least twice a week.

The Progressive Values Scale: Assessing the Ideological Schism on the Left

Progressivism has increasingly challenged traditional liberalism as the dominant influence within left-wing ideology. Across four studies, we developed a measure-the Progressive Values Scale (PVS)-that characterizes distinctly progressive values within the left-wing. In Study 1, left-wing participants evaluated divisive issues, with four scale factors emerging. In Study 2, we confirmed this factor structure and included a battery of personality and values measures to explore individual differences among those who maintain a progressive worldview. In Study 3, we achieved final confirmation of the factor structure and validated the ability of the PVS to assess a distinctly progressive perspective, insofar as progressives generated prototypical faces for Liberals and Conservatives that were markedly distinct from those generated by traditional liberals. In Study 4, we distinguished the PVS from measures of left-wing authoritarianism and demonstrated that it is a better predictor of progressive political preferences and social judgments.

Rapid vigilance and episodic memory decrements in COVID-19 survivors

Recent studies indicate that COVID-19 infection can lead to serious neurological consequences in a small percentage of individuals. However, in the months following acute illness, many more suffer from fatigue, low motivation, disturbed mood, poor sleep and cognitive symptoms, colloquially referred to as 'brain fog'. But what about individuals who had asymptomatic to moderate COVID-19 and reported no concerns after recovering from COVID-19? Here, we examined a wide range of cognitive functions critical for daily life (including sustained attention, memory, motor control, planning, semantic reasoning, mental rotation and spatial-visual attention) in people who had previously suffered from COVID-19 but were not significantly different from a control group on self-reported fatigue, forgetfulness, sleep abnormality, motivation, depression, anxiety and personality profile. Reassuringly, COVID-19 survivors performed well in most abilities tested, including working memory, executive function, planning and mental rotation. However, they displayed significantly worse episodic memory (up to 6 months post-infection) and greater decline in vigilance with time on task (for up to 9 months). Overall, the results show that specific chronic cognitive changes following COVID-19 are evident on objective testing even amongst those who do not report a greater symptom burden. Importantly, in the sample tested here, these were not significantly different from normal after 6-9 months, demonstrating evidence of recovery over time.

Performance of the EQ-5D-Y Interviewer Administered Version in Young Children

(1) Background: An estimated 78% of South African children aged 9-10 years have not mastered basic reading, therefore potentially excluding them from self-reporting on health-related outcome measures. Thus, the aim of this study was to compare the performance of the EQ-5D-Y-3L self-complete to the newly developed interviewer-administered version in children 8-10 years. (2) Methods: Children (n = 207) with chronic respiratory illnesses, functional disabilities, orthopaedic conditions and from the general population completed the EQ-5D-Y-3L self-complete and interviewer-administered versions, Moods and Feelings Questionnaire (MFQ) and Faces Pain Scale-Revised (FPS-R). A functional independence measure (WeeFIM) was completed by the researcher. (3) Results: The 8-year-olds had significantly higher missing responses (x² = 14.23, p < 0.001) on the self-complete version. Known-group and concurrent validity were comparable across dimensions, utility and VAS scores for the two versions. The dimensions showed low to moderate convergent validity with similar items on the MFQ, FPS-R and WeeFIM with significantly higher correlations between the interviewer-administered dimensions of Mobility and WeeFIM mobility total (z = 1.91, p = 0.028) and Looking After Myself and WeeFIM self-care total (z = 3.24, p = 0.001). Children preferred the interviewer-administered version (60%) (x² = 21.87, p < 0.001) with 22% of the reasons attributed to literacy level. (4) Conclusions: The EQ-5D-Y-3L interviewer-administered version is valid and reliable in children aged 8-10 years. The results were comparable to the self-complete version indicating that versions can be used interchangeably.

Big five personality traits and physician-certified sickness absence

Although several studies show that personality traits are associated with absenteeism, few large-scale studies have examined these relationships prospectively, integrating survey data and register data on sickness absence. This study examines whether personality is associated with sickness absence, and whether health factors, gender, age, type of occupation and job satisfaction moderate this relationship. We combine survey data assessing the Big Five personality traits from a large sample of Norwegian employees aged 18–62 years ( N = 5017) with register data on physician-certified sickness absence up to four years after. Negative binomial regression analyses showed that extraversion was positively associated with subsequent sickness absence when controlling for several covariates, including health, work factors and previous spells of sickness absence. Neuroticism also showed significant positive associations with sick leave; however, the association diminished when accounting for previous spells of sickness absence. Moderator analyses demonstrated that age and type of occupation affected some of the associations between personality and sickness absence. The findings indicate that – in addition to general health promotion measures – specific interventions targeting individuals high in extraversion may be beneficial in reducing sick leave. How socio-demographic and work-related factors moderate the relationship between personality and sickness absence may be an interesting future research area.

Big Five traits predict stress and loneliness during the COVID-19 pandemic: Evidence for the role of neuroticism

The rapid outbreak of the coronavirus disease (COVID-19) has affected citizens' daily lives in an unprecedented way. To curb the spread of the pandemic, governments have taken numerous measures such as social distancing and quarantine, which may be associated with psychological consequences, namely stress and loneliness globally. To understand differential associations of personality traits with psychological consequences of COVID-19, we utilize data from a sample of 99,217 individuals from 41 countries collected as part of the COVIDiSTRESS Global Survey. Data were analyzed using multigroup confirmatory factor analysis and multilevel regression models. Findings showed that while some of the associations were rather weak, Big Five personality traits were significantly associated with perceived stress and loneliness during the pandemic. Our study illustrates that neuroticism especially can be a vulnerability factor for stress and loneliness in times of crisis and can contribute to detection of at-risk individuals and optimization of psychological treatments during or after the COVID-19 pandemic.

Determinants of Lifestyle Choices Among South Korean College Students: An Experimental Analysis

Purpose

Based on theoretical predictions from human capital theory, the aim of this exploratory study is to analyze the relationship between experimentally elicited, incentivized economic preference parameters, Big Five and Grit personality traits, cognitive ability, and the Alameda Seven lifestyles: smoking, drinking excessively, being overweight or obese, experiencing stress, following a healthy diet, exercising, and sleeping enough. In addition, self-reported general physical and mental health are analyzed.

Materials and Methods

Data collection took place in an incentivized paper-and-pencil experiment. Undergraduate students were recruited as subjects, with the requirement that they be freshmen, but no restrictions based on gender, major, or age. A pre-test and three experimental sessions were conducted in March and in April 2018, with a total of 178 subjects participating. After deleting observations with missing values, a total of n = 138 subjects remained. Regression analysis (multivariate probit models, resulting marginal effects and changes in predicted probabilities of adopting a lifestyle for “ideal types”) was used to analyze and compare the determinants of the Alameda Seven health behaviors.

Results

Findings suggest that preference parameters, a measure of cognitive ability, and Big Five personality traits are statistically significantly estimated in regressions for the determinants of adopting Alameda Seven health behaviors, but the Grit score is only statistically significantly estimated in a regression for the determinants of reported better general mental health.

Conclusion

The findings regarding preference parameters partly lend support to predictions from human capital theory and partly confirm previous findings in health psychology. Those results might be explained by the relatively small sample size and the inclusion of a measure of cognitive ability in addition to personality traits and preferences.

A systematic review on fake news research through the lens of news creation and consumption: Research efforts, challenges, and future directions

BACKGROUND

Although fake news creation and consumption are mutually related and can be changed to one another, our review indicates that a significant amount of research has primarily focused on news creation. To mitigate this research gap, we present a comprehensive survey of fake news research, conducted in the fields of computer and social sciences, through the lens of news creation and consumption with internal and external factors.

METHODS

We collect 2,277 fake news-related literature searching six primary publishers (ACM, IEEE, arXiv, APA, ELSEVIER, and Wiley) from July to September 2020. These articles are screened according to specific inclusion criteria (see Fig 1). Eligible literature are categorized, and temporal trends of fake news research are examined.

RESULTS

As a way to acquire more comprehensive understandings of fake news and identify effective countermeasures, our review suggests (1) developing a computational model that considers the characteristics of news consumption environments leveraging insights from social science, (2) understanding the diversity of news consumers through mental models, and (3) increasing consumers' awareness of the characteristics and impacts of fake news through the support of transparent information access and education.

CONCLUSION

We discuss the importance and direction of supporting one's "digital media literacy" in various news generation and consumption environments through the convergence of computational and social science research.

Generalized two-tailed hypothesis testing for quantiles applied to the psychosocial status during the COVID-19 pandemic

Nonparametric tests do not rely on data belonging to any particular parametric family of probability distributions, which makes them preferable in case of doubt about the underlying population. Although the two-tailed sign test is likely the most common nonparametric test for location problems, practitioners face serious drawbacks, such as its lack of statistical power and its inapplicability when information regarding data and hypotheses is uncertain or imprecise. In this paper, we generalize the two-tailed sign test by embedding fuzzy hypotheses caused by uncertainty/imprecision regarding linguistic statements on fractions of underlying quantiles. By achieving this objective, (1) crucial limitations of the common two-tailed sign test are mitigated/overcome, (2) various further strengths are incorporated into the sign test (e.g., meeting the trade-off between point- and interval-valued hypotheses, facilitated formulation of fuzzy hypotheses, standardization of membership functions), and (3) shortcomings that often come along with fuzzy hypothesis testing are avoided (e.g., higher complexity, fuzzy test decision, possibilistic interpretation of test results). In addition, we conduct a comprehensive case study using a real data set on the psychosocial status during the COVID-19 pandemic. The results of the case study clearly indicate that the generalized two-tailed sign test is preferable to the two-tailed sign test with point- or interval-valued hypotheses.

Violent media use and aggression: Two longitudinal network studies

Exposure to violent media has been widely linked to increased aggression. In the present research, we examined whether violent media exposure would be associated with increased aggression, which would then spread within social networks like a contagious disease. Two groups of first year psychology students completed a questionnaire three times over the course of a year, measuring their media exposure, aggression, personality, and social relations within the group. Cross-sectional analysis provided mixed results in regards to the link between violent media and aggression. Siena analysis found no evidence of homophily (i.e., participants were not more likely to be friends with others similar to themselves) nor of social influence (i.e., participant's behavior did not predict a change in their friends' behavior). However, given the relatively small sample sizes and the weak ties between participants, more work is needed to assess the spread of violent media effects.

Differences Between Omnivores and Vegetarians in Personality Profiles, Values, and Empathy: A Systematic Review

Numerous medical studies have documented vegetarian diets as having various health benefits. Studies have also compared vegetarians with other dietary groups from a socio-psychological perspective. The objective of this review is to investigate the differences between vegetarians and omnivores in terms of their personality profiles, values, and empathy skills. A search was conducted across three electronic databases. Non-randomized, observational, cross-sectional, and cohort studies were eligible. Outcomes provided information about the differences between the above-mentioned dietary groups regarding their personality profiles, values, and empathy skills. A shortened version of the Newcastle–Ottawa Scale was used to assess the risk of bias for the included studies. Of the 2,513 different studies found, 25 (total number of participants n = 23,589) were ultimately included. These studies indicate that vegetarians significantly differ from omnivores in their personalities, values, and ability to be empathetic. Omnivorism is associated with an increased orientation toward social dominance, greater right-wing authoritarianism, and, in line with this, a stronger tendency to be prejudiced. Vegetarianism is associated with greater openness and empathy. The values of vegetarians are based more on universalism, hedonism, stimulation, and self-direction, whereas the values of omnivores are based more on the idea of power. To answer a narrowly defined and clear question, issues such as animal ethics, animal rights, and environmental protection are not considered in this review. The findings of this review, showing marked differences in personality correlating to the choice of diet and the increasing influence of plant-based diets on a global level, indicate that further studies about vegetarianism are warranted.