Neuroticism and self-reported somatic health: a twin study

Using a twin sample (N?=?188; 53 monozygotic and 39 dizygotic twin pairs, and 4 single twins whose co-twin did not participate), this study sought (1) to estimate heritabilities of neuroticism and of somatic complaints rated on the basis of two different time frames ('the last week' vs. 'in general'); (2) to estimate the genetic association between neuroticism and the complaints indices and (3) to examine to what extent somatic complaints are aetiologically distinct from neuroticism. Using models with common additive genetic (A) and individual-specific environmental (E) factors, the heritabilities for neuroticism and complaints 'in general' and during 'the last week' were 0.46 (0.20-0.65), 0.44 (0.22-0.62), and 0.45 (0.22-0.63), respectively. Nearly 60% of the phenotypic correlation between neuroticism and somatic complaints were accounted for by A. Furthermore, a substantial part of the variance in somatic complaints was due to unique genetic and individual-specific environmental influences unrelated to neuroticism. These results suggest that somatic complaints are moderately heritable and that a considerable portion of the covariance between neuroticism and complaints measures is due to genetic factors. Yet, the findings also suggest that these two attributes are distinct entities with overlapping, but not identical, underlying genetic and environmental influences.     

A simulation laboratory for statistics

In this paper, we describe a general purpose data simulator, Datasim, which is useful for anyone conducting computer-based laboratory assignments in statistics. Simulations illustrating sampling distributions, the central limit theorem, Type I and Type II decision errors, the power of a test, the effects of violating assumptions, and the distinction between orthogonal and non-orthogonal contrasts are discussed. Simulations illustrating other statistical concepts—partial correlation, regression to the mean, heteroscedasticity, the partitioning of error terms in splitplot designs, and so on—can be developed easily. Simulations can be assigned as laboratory exercises, or the instructor can execute the simulations during class, integrate the results into an ongoing lecture, and use the results to initiate class discussion of the relevant statistical concepts.     

Neuroticism and vigilance revisited: A transcranial doppler investigation

Selecting for vigilance assignments remains an important factor in human performance research. The current study revisits the potential relationship between vigilance performance and trait neuroticism, in light of two possible theories. The first theory suggests that neuroticism impairs vigilance performance by competing for available resources. The second theory, attentional control theory, posits that high neuroticism can result in similar or superior performance levels due to the allocation of compensatory effort. In the present study, Transcranial Doppler Sonography was used to investigate the neurophysiological underpinnings of neuroticism during a 12-min abbreviated vigilance task. Performance results were not modified by level of neuroticism, but high neuroticism was associated with higher initial CBFV levels and a greater CBFV decrement over time. These findings indicate that participants higher in neuroticism recruited additional cognitive resources in order to achieve similar performance, suggesting that there is more of an effect on processing efficiency than effectiveness.     

Neuroticism in Marriage: II. The Incidence of Neuroticism (Continued)

Abstract

The purpose of the experiment was to demonstrate whether men are more aggressive when disappointed by a woman whom they like rather than dislike. First, 78 men, 19 to 24 years of age, were recruited by using a newspaper advertisement. They were then placed in one of the two conditions: They were confronted by a female confederate that they either liked or did not like; they then received either positive or negative personal evaluations by the particular confederate in relation to prose-reading tasks. Dependent measures on blood pressure, use of bogus electric shock on a person, and evaluation of the confederate were taken as measures of aggression. The following predictions were made: (a) Negative evaluations by the liked confederate would result in more aggression than by either a disliked confederate or by a liked confederate giving a positive evaluation, and (b) subjects would be more aggressive when the female confederate gave them a negative rather than a positive evaluation or when she was disliked rather than liked. Predictions were supported on all the measures of aggression.     

Neuroticism as predisposition toward depression: A cognitive mechanism

The relations between the personality trait of neuroticism and mechanisms of cognitive processing are reviewed. Major experimental findings in this area are described and used to evaluate a number of different cognitive theories of neuroticism, including spreading-activation, self-schema and fragmentation models. The empirical findings centre on the observation of idiosyncratic patterns of cognitive processing of emotional stimuli as a function of the level of neuroticism. These idiosyncracies are similar to those which have been observed to occur as a function of depressed mood, and it is suggested that they may be of relevance to the development and maintenance of clinical depression and other emotional disorders. Specifically, it is hypothesized that the cognitive processing of negative self-related information is generally facilitated among high N scorers and that, in appropriate circumstances, this tendency can lead to episodes of clinical depression.     

Mental health and quality of life in non-binary transgender adults: a case control study

Abstract

Background: The social challenges that non-binary people experience, due in part to social intolerance and the lack of validation of non-binary gender identities, may affect the mental health and quality of life of this population. However, studies that have distinguished between non-binary and binary transgender identities are lacking.

Aim: To compare the mental health and quality of life of a community sample of non-binary transgender adults with controls (binary transgender people and cisgender people) matched on sex assigned at birth.

Method: A total of 526 participants were included. Ninety-seven were classified as non-binary and were compared with two control groups: 91 people classified as binary and 338 cisgender people. Only transgender people not on gender affirming hormone treatment or who had not undergone gender affirming surgery were included. Participants were invited to complete an online survey that included mental health and quality of life measures.

Results: Non-binary people reported significantly better mental health than binary transgender people, but worse than cisgender people. Overall, there were no significant differences in quality of life between non-binary and binary transgender participants assigned male at birth and transgender females, but non-binary assigned males at birth had better scores on the psychological and social domains of quality of life than transgender males. Quality of life was better across all domains in cisgender people than transgender groups.

Conclusion: There is an inequality with regard to mental health and quality of life between non-binary (and binary) transgender people and the cisgender population that needs to be addressed. The better mental health scores in non-binary people may reflect lower levels of body dissatisfaction among the non-binary population. Mental health problems and poor quality of life are likely to have social causes and hence legislative measures and broader government-led inclusive directives should be put in place to recognize and to validate non-binary identifying people.     

The role of primary prevention in mental health services: A review and critique

Community psychology in the West has had a growing impact on mental health service provision. One facet of this development has been the advocacy of an increased focus on the primary prevention of mental illness. This paper reviews both theoretical and practical work in this area in order to assess the current role and relevance of primary preventive interventions. There is a discussion of primary prevention's historical and theoretical contexts, of its conceptualisations and definitions, of criticisms of its relevance and efficacy, and of examples of its practice. It is argued that primary prevention is inappropriately marginalised in current service provision and that there is a need to engage in the long-term planning and evaluation of primary preventive interventions in order to facilitate their fuller incorporation into national and local policies on mental health.     

The effects of self-injury on acute negative arousal: A laboratory simulation

Research suggests that performance of non-suicidal self-injury (NSSI) is associated with the reduction of high-arousal negative affect. The present study examined this phenomenon in a laboratory setting. Individuals with a history of NSSI (n?=?39) and non-NSSI controls (n?=?33) underwent an anger induction, and were randomized to self-administer either a high level of electric shock, or a mild shock (control condition) to their upper arm. Consistent with previous research, injurers displayed greater pain analgesia than controls. Contrary to expectations, high shock did not result in enhanced arousal reduction for injurers. However, the high shock led to greater arousal reduction for injurers than controls. Notably, in the high shock condition, higher levels of electrical stimulation (i.e., voltage administered) predicted greater reductions in negative arousal, whereas higher subjective ratings of pain predicted smaller reductions in negative arousal. This pattern suggests that more intense self-inflicted pain facilitates reduction of negative arousal provided the subjective experience of pain is not too aversive. Findings help clarify emotion-regulation models of NSSI.     

A community mental health clinic's infant-toddler services

A community mental health clinic study of 20 infants for psychological risk status combined with a group of mother (200) and infant-toddler visits (450) over 1-year period is described as a program for providing services to the 0 to 3 age group. Recent studies in the development of human competence emphasize the importance of these years in obtaining various social and nonsocial abilities that are crucial to life and/or work satisfaction. The community mental health clinic has the knowledge, expertise, and mandate to provide services to this age group.     

Health services and health care economics: the health psychology marketplace.

In an effort toward cost containment, the health care system in the United States has undergone radical changes in the last decade. These changes have influenced the delivery of clinical health psychology services. This article reviews several economic and marketing factors salient to the clinical health psychology marketplace. For example, these economic changes have placed greater emphasis on the need for cost-effectiveness and accountability in the health psychology field. Implications for education and training, collaboration with other health care specialties, new practice initiatives, and public relations are reviewed. Future challenges and opportunities for clinical health psychology are discussed.     

TYMES: A high-level language for process control and data manipulation in the behavior laboratory

This paper describes outlines of the TYMES software system designed and developed to control complicated experiments in the behavior laboratory. A versatile programming language is adopted to perform a wide range of real-time data manipulations and interactive controls based on a PDP-11 small computer.     

Cooperation versus competition in a mass emergency evacuation: A new laboratory simulation and a new theoretical model

Virtual reality technology is argued to be suitable to the simulation study of mass evacuation behavior, because of the practical and ethical constraints in researching this field. This article describes three studies in which a new virtual reality paradigm was used, in which participants had to escape from a burning underground rail station. Study 1 was carried out in an immersion laboratory and demonstrated that collective identification in the crowd was enhanced by the (shared) threat embodied in emergency itself. In Study 2, high-identification participants were more helpful and pushed less than did low-identification participants. In Study 3, identification and group size were experimentally manipulated, and similar results were obtained. These results support a hypothesis according to which (emergent) collective identity motivates solidarity with strangers. It is concluded that the virtual reality technology developed here represents a promising start, although more can be done to embed it in a traditional psychology laboratory setting.     

Accurate Judgments of Neuroticism at Zero Acquaintance: A Question of Relevance

Prior studies have consistently found a surprising inaccuracy of people's neuroticism judgments at zero acquaintance. Based on the Realistic Accuracy Model (Funder, 1995), we hypothesize that this is due to a lack of relevance of the situation in which targets are typically observed. Fifty participants were videotaped in a highly trait‐relevant (i.e., socially stressful) situation as well as three less relevant situations. An aggregate of self‐reports and informant reports was used as the accuracy criterion. Four independent groups of unacquainted observers judged participants' neuroticism based on these short video sequences. Results showed that neuroticism judgments were significantly more accurate for the most trait‐relevant situation compared with the other three situations. This finding can be explained using lens model analyses: Only in the most relevant situation did neuroticism predict both visual nervousness and vocal nervousness, both of which in turn predicted neuroticism judgments by lay observers. Our findings show that strangers are sensitive to interindividual differences in neuroticism as long as targets are observed in a trait‐relevant situation.