The serial mediation effect of prospective imagery vividness and anxiety symptoms on the relationship between perceived stress and depressive symptoms among Chinese vocational college students during the COVID-19 pandemic.

The mental health of vocational college students has been neglected during the COVID-19 pandemic. Prospective imagery may play a role in the relationships among stress, anxiety and depression. This study aimed to survey the mental health of Chinese vocational college students and explore the mediation effect of prospective imagery vividness and anxiety symptoms on the relationship between perceived stress and depressive symptoms. A total of 2, 381 vocational college students (Mage = 18.38 years, range: 16-21, SD = 0.92) provided self-report data on perceived stress, anxiety and depressive symptoms and prospective imagery vividness. Two potential serial mediation models were postulated regarding the roles of prospective imagery vividness and anxiety symptoms in the relationship between perceived stress and depressive symptoms. The prevalence rates of stress, anxiety and depressive symptoms were 55.7%, 33.2% and 53.5%, respectively, among vocational college students. Perceived stress was associated with decreased vividness of positive prospective imagery and increased vividness of negative prospective imagery and anxiety symptoms, leading to increased depressive symptoms. Additionally, prospective imagery vividness and anxiety symptoms had a serial mediation effect on the relationship between perceived stress and depressive symptoms. The results demonstrated that impoverished vividness of positive prospective imagery is not only a central feature of depression but also associated with anxiety. Interventions targeting prospective imagery vividness may alleviate anxiety and depressive symptoms among Chinese vocational college students and should be implemented as soon as possible during the COVID-19 pandemic.

Are mindful people less involved in online trolling? A moderated mediation model of perceived social media fatigue and moral disengagement.

Online trolling is aggressive online behavior that has severe consequences for the mental health of internet users. Online trolling can be influenced by personal factors and psychological states. Based on the General Aggression Model, moral disengagement was examined as a moderator of the direct and indirect relations between mindfulness and online trolling via social media fatigue. A total of 1123 college students completed questionnaires regarding their experience with online trolling, mindfulness, social media fatigue, and moral disengagement. The results showed that individuals with high mindfulness were less likely to troll others online, which was mediated by their social media fatigue. Furthermore, moral disengagement moderated the indirect relationship between mindfulness and online trolling. Specifically, the relationship between mindfulness and social media fatigue became weaker for individuals with high moral disengagement. The relationship between social media fatigue and online trolling became strengthened for individuals with high moral disengagement. These findings elucidate the role of personal factors and the present internal state in online trolling and suggest that comprehensive intervention programs may be promising for reducing online trolling.

Is high exposure to antisocial media content associated with increased participation in malicious online trolling? exploring the moderated mediation model of hostile attribution bias and empathy.

Malicious online trolling is prevalent among Chinese college students and has recently garnered extensive attention from researchers due to the substantial harm it causes to the victims and the damage it inflicts on the online environment. Most previous studies have focused on examining how personal traits related to malicious online trolling. Further comprehensive research is needed to explore the mechanisms linking external environmental factors (antisocial media exposure) and malicious online trolling. A total of 1259 Chinese college students completed questionnaires regarding malicious online trolling, antisocial media exposure, hostile attribution bias, and empathy. The results indicated a positive association between antisocial media exposure and malicious online trolling among Chinese college students, with hostile attribution bias serving as a mediating factor. Furthermore, the direct and mediated paths between antisocial media exposure and malicious online trolling were moderated by empathy. Specifically, as the level of empathy increased among college students, the relations between the variables all weakened. Excessive exposure to antisocial media content among college students may trigger hostile attribution bias and lead to more malicious online trolling behavior. However, the relation between antisocial media exposure and malicious online trolling, hostile attribution bias and malicious online trolling, was attenuated when college students' empathy levels were high.

Combining multiple feature selection methods and structural equation modelling for exploring factors affecting stand biomass of natural coniferous-broad leaved mixed forests.

Recognition of biotic and abiotic factors affecting biomass of natural mixed forests is of great importance for forest carbon estimation and management. When estimating stand biomass using models, different variable selection methods often yield inconsistent results, and there is lack of systematic analysis. This study aimed to combine multiple feature selection methods with structural equation modelling (SEM) to identify a set of variables affecting stand biomass more reasonably. Eight methods were applied for feature selection based on data from 286 permanent sample plots in natural coniferous-broad leaved mixed forests in northeast China. These methods included Pearson correlation analysis, two methods derived from principal component analysis (PCA), stepwise regression, redundancy analysis (RDA), generalized additive model (GAM), random forest (RF), and boosted regression tree (BRT). A total of 56 candidate variables were considered, covering stand, biodiversity, climate and soil features. Significant variability was observed in the variables selected, however, there were 6 variables consistently identified across all methods, including tree species diversity (N_Sp_Div), stand structural diversity (N_ Size_ Div), nearest taxon index (NRI), community weighted mean based on dry matter mass of leaves (CWM.LDMC), soil pH, and degree-days above 18 °C (DD18). Then, these variables were included in the SEM with stand average age and additive stand density index (aSDI) to explore the direction and magnitude of their impacts on stand biomass. The SEM results showed that aSDI and average age had the greatest positive effects on stand biomass, and structural diversity also had a significant positive effect. DD18 affected stand biomass both directly and indirectly, with the total negative effect. Soil pH indirectly affected stand biomass via aSDI. Our findings demonstrated that combining multiple feature selection methods with SEM was an effective approach for understanding multiple factors affecting stand biomass, and provided valuable insights for forest biomass estimation and carbon management.

The Effect of Social Appearance Anxiety on the Online Impulse Purchases of Fashionable Outfits Among Female College Students During Pandemic Periods: The Mediating Role of Self-Control and the Moderating Role of Subjective Socioeconomic Status.

Purpose: With the rise of social media, an increasing number of young females have focused more attention on their body image, leading to social appearance anxiety. Thus, the current study aimed to investigate a moderated mediation model of social appearance anxiety and online impulse purchases of fashionable outfits through self-control moderated by subjective socioeconomic status during the pandemic. Methods: A total of 1651 female college students (Age = 17-24, Mage = 19.30, SD = 1.14) with more than one month of closed-off management experience completed self-report questionnaires concerning social appearance anxiety, self-control, online impulse purchases of fashionable outfits, and subjective socioeconomic status. Results: After controlling for the potential influence of coronavirus stress, the results indicated that social appearance anxiety was positively related to online impulse purchases of fashionable outfits among female college students during the pandemic, mediated by self-control. Furthermore, subjective socioeconomic status moderated the indirect link between social appearance anxiety and the online impulse purchase of fashionable outfits. Specifically, subjective socioeconomic status buffers the negative effect of social appearance anxiety on self-control and the risk effect of low self-control on the online impulse purchases of fashionable outfits. Implications: The current study deepens the research on the relationship between social appearance anxiety and online impulse purchases during pandemic periods; meanwhile, it provides evidence for preventing excessive online impulse purchases of fashionable outfits among young females.

Brain activation and individual differences of emotional perception and imagery in healthy adults: A functional near-infrared spectroscopy (fNIRS) study.

The current study investigated the brain activation and individual differences in perception and imagery of sad pictures versus happy and neutral pictures. Sixty-eight healthy adults were instructed to view and visualize sad, happy, and neutral pictures during 64-channel functional near-infrared spectroscopy (fNIRS) recording. The results indicated that emotional perception evoked increased occipital activation, while emotional imagery involved increased activation in the bilateral prefrontal and parietal cortex. Sad pictures evoked decreased brain activation in the occipital and prefrontal cortex than happy and neutral pictures. For women, imagery activation was greater than perception activation in the right parietal cortex. Additionally, participants' self-rated imagery vividness was positively correlated with the occipital activation during happy imagery and trait rumination was negatively correlated with the occipital activation during perception. The findings suggest that emotional perception may involve the bottom-up sensory input, while emotional imagery may involve the top-down cognitive processes. Healthy individuals engage decreased cognitive resources for sad perception and imagery. Moreover, our observation could provide useful information to establish fNIRS assessment as an objective tool to monitor the emotional status on an individual trait basis.

Online Disinhibition and Online Trolling Among Chinese College Students: The Mediation of the Dark Triad and the Moderation of Gender.

The Dark Triad (Machiavellianism, psychopathy, narcissism) is associated with online disinhibition and antisocial online behaviors. However, the mediating role between online disinhibition and online trolling has never previously been investigated. We examined direct and indirect associations between online disinhibition and online trolling via the Dark Triad among 1,303 participants. The results showed that online disinhibition is positively correlated with online trolling, and their link is partly mediated by Machiavellianism and psychopathy. Furthermore, men exhibited higher levels of Dark Triad traits and were more likely to engage in online trolling than women. Moderated mediation analyses indicated that gender moderated the relationship between psychopathy and online trolling. The study provided a promising perspective for the intervention of online trolling, namely netizens should be taught to reduce impulsivity and improve empathy and self-control, especially for men.

Does mindfulness reduce trolling? The relationship between trait mindfulness and online trolling: The mediating role of anger rumination and the moderating role of online disinhibition.

BACKGROUND: Online trolling is a highly prevalent online antisocial behaviour that has recently received increasing attention because of its potentially destructive consequences. The current study aimed to examine whether trait mindfulness was negatively related to online trolling and whether anger rumination mediated this relationship. We further examined whether online disinhibition moderated the direct and indirect relation between trait mindfulness and online trolling. METHODS: A total of 1303 Chinese college students completed the measurements of trait mindfulness, anger rumination, online disinhibition, and online trolling. Moderated mediation analysis was performed to examine the relationships between these variables. RESULTS: After controlling for sex, the results showed that trait mindfulness was negatively related to online trolling and that this relationship was partially mediated by anger rumination. Moreover, the effect of anger rumination on online trolling was strengthened when online disinhibition was high. LIMITATIONS: This study is a cross-sectional study, and causal inferences cannot be drawn. CONCLUSIONS: Individuals with trait mindfulness are less likely to ruminate anger and further express less online trolling. Online disinhibition serves as a risk factor for online trolling. Interventions targeting trait mindfulness, anger rumination, and online disinhibition might aid prevention strategies.

Polymeric coatings that mimic the endothelium: combining nitric oxide release with surface-bound active thrombomodulin and heparin.

Multi-functional bilayer polymeric coatings are prepared with both controlled nitric oxide (NO) release and surface-bound active thrombomodulin (TM) alone or in combination with immobilized heparin. The outer-layer is made of CarboSil, a commercially available copolymer of silicone rubber (SR) and polyurethane (PU). The CarboSil is either carboxylated or aminated via an allophanate reaction with a diisocyanate compound followed by a urea-forming reaction between the generated isocyanate group of the polymer and the amine group of an amino acid (glycine), an oligopeptide (triglycine) or a diamine. The carboxylated CarboSil can then be used to immobilize TM through the formation of an amide bond between the surface carboxylic acid groups and the lysine residues of TM. Aminated CarboSil can also be employed to initially couple heparin to the surface, and then the carboxylic acid groups on heparin can be further used to anchor TM. Both surface-bound TM and heparin's activity are evaluated by chromogenic assays and found to be at clinically significant levels. The underlying NO release layer is made with another commercial SR-PU copolymer (PurSil) mixed with a lipophilic NO donor (N-diazeniumdiolated dibutylhexanediamine (DBHD/N(2)O(2))). The NO release rate can be tuned by changing the thickness of top coatings, and the duration of NO release at physiologically relevant levels can be as long as 2 weeks. The combination of controlled NO release as well as immobilized active TM and heparin from/on the same polymeric surface mimics the highly thromboresistant endothelium layer. Hence, such multifunctional polymer coatings should provide more blood-compatible surfaces for biomedical devices.