Subjects: Psychology >> Social Psychology submitted time 2023-03-27 Cooperative journals: 《心理学报》
Abstract： Mindfulness meditation (MM) has enjoyed a growing popularity in healthcare in recent years when bio-psycho-social approaches are becoming more and more emphasized in modern medicine. There has been mounting empirical evidence showing MM’s significant effectiveness in alleviating anxiety for both nonclinical and clinical populations. However, the effect size of the available empirical investigation results has remained inconsistent and possible moderators have yet to be explored comprehensively. In order to determine the immediate and long-term efficacy of MM in overcoming anxiety, we conducted a meta-analysis based on a systematic and comprehensive review of the published studies on mindfulness-based interventions for anxiety. We also examined whether some characteristics of research participants (e.g. age, geographic areas) and interventions (e.g. format, duration, at-home practice), and specifics of the study (i.e. types of control, quality of the study) and data analysis (e.g. attrition rate) moderate the magnitude of the effectiveness of MM interventions (11variables). The review was performed following the rigorous PRISMA Protocol. Published studies using randomized controlled trial were selected from major databases worldwide to include investigations conducted in both Western and Eastern countries. Databases used include VIP Journal Integration Platform, Wan fang, China National Knowledge Infrastructure, Scopus, Web of Science, Embase, the Cochrane Library, and PubMed. Keywords used are mindfulness, meditation, MBSR, MBCT, anxi*, mood, intervention, therapy, program. Using the random effect model, we pooled the effect size (Hedge’s g), and conducted a publication bias evaluation, a moderating effect analysis and an interaction analysis in CMA 3.3. Results of our analyses revealed fifty-five RCTs from both Eastern and Western countries (k = 68 samples, N = 4595 participants). Mindfulness meditation for treating anxiety is shown to be efficacious with a medium to large immediate effect (g = 0.60), but the effect is not reliably shown at follow-up assessments. The post-heterogeneity test result suggests that using the random effect model is reasonable. Univariate meta-regression analysis yielded that study quality, geographic areas, participants’ age, intervention format (Group vs. Individual), amount of at-home practice, and attrition rate shown in data analysis remarkably influenced the effect size of MM’s immediate effect, while types of control, health condition, mindfulness practice experience, intervention duration, or statistical analysis methods used (ITT vs. PP) did not appear to moderate MM’s immediate effectiveness for reducing anxiety. Additionally, geographic areas affect the effect size the most. Multiple meta-regression models suggested that type of control and geographic areas, as well as statistical analysis methods significantly moderate the effect size of intervention effectiveness. Overall, the study results demonstrated high immediate effect of mindfulness-based practices for alleviating anxiety, but the effect did not seem to last. In addition, geographic area turns out to be the strongest moderator, and practitioners in the East seem to benefit more than those who are in the West. Study quality, participants’ age, mindfulness practice experience, intervention format, at-home practice quantity and attrition rate also affect the effect size to a certain extent. Future research is warranted to improve methodological quality of outcome studies, to provide more clear and replicable evidence of MM efficacy, and to explore more underlying moderators for the intervention effect size, such as participant satisfaction and so forth.
Subjects: Psychology >> Social Psychology submitted time 2023-03-27 Cooperative journals: 《心理学报》
Abstract： Juvenile crime, as an important factor of public security, has extensively concerned the whole society. Although juvenile offenders with antisocial tendency exhibit unique behavior patterns and development characteristics, few studies have investigated the potential mechanism of aggressive behaviors in juvenile offenders. Based on the dual-hormone hypothesis and social information processing theory, It is plausible to argue that biological hormones and the social information processing process related to hostile might play an fundamental role in shaping aggressive behaviors of juvenile offenders. Therefore, the present study proposes a moderated mediating model and examined the prediction of testosterone for aggressive behaviors in juvenile offenders that is mediated by hostile attention bias and moderated cortisol. Drawing on both biological hormone and social cognition perspectives, the present study attempts to answer the questions of “how” testosterone affects aggressive behavior and “when” the effect will be present, which provides implications for further developing interventions against aggressive behaviors in juvenile offenders with antisocial tendency. This study included 84 juvenile offenders (average age: 17.55, standard deviations: 0.52) as participants. Their aggressive behavior was measured using the Chinese version of the Buss-Perry Attack Scale (AQCV). Enzyme-Linked Immunosorbent Assay (ELISA) was utilized to measure the salivary testosterone and cortisol levels of the participants. Moreover, the participants' attention biases toward hostile aggressive phrases and hostile facial expressions were evaluated using an adopted Stroop and the dot-probe paradigm, respectively. Both traditional and trail-level attention bias scores were calculated to reflect the participants' attention bias statically and dynamically.Results showed that (1) attention bias toward hostile stimuli (Variability, Peak TL-BSNEGATIVE) played a complete mediation role in the relationship between testosterone and aggressive behavior (i.e. variability played a complete mediation role in the prediction of AQCV total score, physical aggression subscale score, and anger subscale score. Peak TL-BSNEGATIVE played a complete mediation role in the prediction of verbal aggression subscale score by testosterone). (2) Cortisol moderated the relationship between testosterone and attention bias toward hostile stimuli. More specifically, at a high cortisol level, testosterone positively predicted individual attention avoidance (Peak TL-BSNEGATIVE) and variability, thereby reducing the aggression level. However, the mediation effect of attention bias toward hostile stimuli was not significant at a low cortisol level. Based on the dual-hormone hypothesis and social information processing theory, the present study examined a moderated mediating model in a sample of juvenile offenders with antisocial tendency using the perspectives of biological hormone and social information processing in aggressive behaviors. The present study revealed a potential development mechanism of aggressive behaviors in juvenile offenders and thus provides an empirical foundation for hormone-based interventions against aggressive behaviors in juvenile offenders. Finally, on the basis of the mediation and moderation effects of biological hormones on aggressive behavior, the present study indicates that increasing attention avoidance and the cortisol level for juvenile offenders with antisocial tendency might help reduce their aggressive violence.
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