Extraversion and behavioral impulsivity

Decision-making in single and multiple-screen CCTV surveillance

One task of CCTV operation is to decide whether footage shown in videos depicts criminal behaviour, or allows a viewer to predict its occurrence. An increasing prevalence of cameras in the world, means an increase in screens in the control room. This presents a signal-to-noise challenge where the signal (criminal activity) may become more difficult to detect amongst the noise. We used signal detection approaches to understand which factors were associated with decision-making in a CCTV task. When detecting aggressive incidents, higher conscientiousness was associated with making better decisions, with a higher criterion for responding (meaning fewer false-positive responses). However, conscientious individuals tended to be less confident (in multiplex displays), and were slower in responding - which reflects that these individuals require more evidence to make these decisions. Higher trait cognitive anxiety was again associated with making earlier responses, while extraversion was also associated with earlier responding in multiplexed displays. Taken in combination, our results suggest that there is a fine balance between making correct decisions, and making early decisions - and that these need to be considered together in the CCTV task.

Wielding a gun increases judgments of others as holding guns: a randomized controlled trial

The gun embodiment effect is the consequence caused by wielding a gun on judgments of whether others are also holding a gun. This effect could be responsible for real-world instances when police officers shoot an unarmed person because of the misperception that the person had a gun. The gun embodiment effect is an instance of embodied cognition for which a person’s tool-augmented body affects their judgments. The replication crisis in psychology has raised concern about embodied cognition effects in particular, and the issue of low statistical power applies to the original research on the gun embodiment effect. Thus, the first step was to conduct a high-powered replication. We found a significant gun embodiment effect in participants’ reaction times and in their proportion of correct responses, but not in signal detection measures of bias, as had been originally reported. To help prevent the gun embodiment effect from leading to fatal encounters, it would be useful to know whether individuals with certain traits are less prone to the effect and whether certain kinds of experiences help alleviate the effect. With the new and reliable measure of the gun embodiment effect, we tested for moderation by individual differences related to prior gun experience, attitudes, personality, and factors related to emotion regulation and impulsivity. Despite the variety of these measures, there was little evidence for moderation. The results were more consistent with the idea of the gun embodiment effect being a universal, fixed effect, than being a flexible, malleable effect.

Subscales of the Barratt Impulsiveness Scale differentially relate to the Big Five factors of personality

The place of impulsiveness in multidimensional personality frameworks is still unclear. In particular, no consensus has yet been reached with regard to the relation of impulsiveness to Neuroticism and Extraversion. We aim to contribute to a clearer understanding of these relationships by accounting for the multidimensional structure of impulsiveness. In three independent studies, we related the subscales of the Barratt Impulsiveness Scale (BIS) to the Big Five factors of personality. Study 1 investigated the associations between the BIS subscales and the Big Five factors as measured by the NEO Five-Factor Inventory (NEO-FFI) in a student sample (N = 113). Selective positive correlations emerged between motor impulsiveness and Extraversion and between attentional impulsiveness and Neuroticism. This pattern of results was replicated in Study 2 (N = 132) using a 10-item short version of the Big Five Inventory. In Study 3, we analyzed BIS and NEO-FFI data obtained from a sample of patients with pathological buying (N = 68). In these patients, the relationship between motor impulsiveness and Extraversion was significantly weakened when compared to the non-clinical samples. At the same time, the relationship between attentional impulsiveness and Neuroticism was substantially stronger in the clinical sample. Our studies highlight the utility of the BIS subscales for clarifying the relationship between impulsiveness and the Big Five personality factors. We conclude that impulsiveness might occupy multiple places in multidimensional personality frameworks, which need to be specified to improve the interpretability of impulsiveness scales.

Impulsivity in women with eating disorders: problem of response inhibition, planning, or attention?

OBJECTIVE

Impulsivity is generally believed to be more characteristic of individuals with bulimic than with restrictive eating disorders (EDs). However, studies have not exhaustively explored the association between EDs and various component dimensions of the impulsivity construct.

METHOD

We conducted a multidimensional assessment of impulsivity in 84 women with bulimia nervosa (BN), 37 with anorexia nervosa (AN: 19 restricters and 18 bingers-purgers), and 61 normal-control participants. To assess multiple components of impulsivity, participants completed a battery of self-report questionnaires and a performance test.

RESULTS

Compared with normal-control participants, all ED groups showed attentional problems. However, only women suffering BN or AN-binge purge subtype showed elevations on motoric forms of impulsivity, whereas women with BN were the only group to report tendencies toward reckless behavior.

CONCLUSION

These findings suggest that binge-eating behavior coincides with problems of response inhibition, whereas a risk-taking attitude may be a unique characteristic of individuals with BN.

Zuckerman-Kuhlman Personality Questionnaire: preliminary results of the Italian version

A study was conducted to assess the psychometric properties of the translated Zuckerman-Kuhlman Personality Questionnaire in an Italian sample. Factorial analysis of the items, performed over 356 respondents (200 women and 156 men) showed a clear correspondence between factorial components and the five a priori hypothesized dimensions. The Italian version has provided satisfactory Cronbach coefficients alpha. Sex differences and intercorrelations among scales are similar to those in the original American sample. Correlations among the dimensions and four other personality measures yielded a satisfactory validity. The low power in this study may explain why the five derived factors explained only 27.6% of the variance in scores. Results suggest that the Italian version is a reliable tool for Italian research in the field of personality and individual differences.

Behavioral disinhibition induced by tryptophan depletion in nonalcoholic young men with multigenerational family histories of paternal alcoholism

OBJECTIVE

A deficit in serotonergic neurotransmission has been linked to impulsive behavior, as well as to disorders characterized by disinhibition. The present study tested the hypothesis that young men at high risk for alcoholism demonstrate greater behavioral disinhibition after acute dietary depletion of tryptophan, the amino acid precursor of serotonin.

METHOD

A double-blind, placebo-comparison, between-subjects study design was used. Nonalcoholic young men with a multigenerational paternal family history of alcoholism (N = 13) or with no family history of alcoholism (N = 15) in two previous generations were administered mixtures of tryptophan-deficient amino acid to achieve plasma tryptophan depletion. Comparison subjects with a multigenerational paternal family history of alcoholism (N = 1) and comparison subjects with no family history of alcoholism (N = 18) were given a balanced mixture. Five hours after this, all were tested on a modified Taylor task and a go/ no-go task measuring aggressive response and disinhibition, respectively.

RESULTS

Plasma tryptophan levels were reduced by 89% in both groups. Tryptophan depletion had no effect on aggressive response. In contrast, tryptophan-depleted individuals with a family history of alcoholism made more commission errors (responses to stimuli associated with punishment or loss of reward) than did tryptophan-depleted individuals with no family history of alcoholism and those receiving the balanced (comparison) mixture of amino acid in either group.

CONCLUSIONS

Low serotonin levels may be implicated in the high disinhibition or impulsivity observed in some individuals with a genetic vulnerability to alcohol abuse or dependence.