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Food waste at the consumer level poses a global challenge for natural resources management and contributes to climate change. However, there is limited evidence regarding the best messaging strategies to fight household food waste. Here we experimentally test several food waste messages, aiming to identify the most effective strategies to promote individuals’ willingness to tackle food waste in the future. We used participants recruited via MTurk and employed a between-subjects design. Study 1 (N = 261) tested three common prompts (“reduce waste”, “don’t waste” or “stop waste”) and showed that only prompts to “reduce waste” were effective. Study 2 (N = 733) tested several consequences of food waste (economic, social or environmental), with none showing a significant effect on the willingness to tackle food waste. Lastly, Study 3 (N = 1459) tested whether combining different stimuli (prompts, consequences, tips for action) would produce stronger effects, but revealed mixed results, suggesting that more information is not necessarily better to help fight food waste. Implications for policy-making and intervention are discussed. These conclusions are based on self-reported measures and thus future research should further corroborate these results in field studies with an observed food waste impact.

Objective: This research examines the relationship between passion for a romantic partner and obsessive relational intrusion (ORI) which is defined as repeated and unwanted behaviors toward a partner that invade his/her personal privacy and cause fear for his/her safety.Method: Based on the dualistic model of passion, we predicted that obsessive passion (OP) would be associated with fear of abandonment, which in turn would be associated with ORI. In contrast, harmonious passion (HP) should not be associated with ORI.Results: Four studies (N = 1257) supported these predictions. Study 1 found cross-sectional support for these hypotheses from the victim's perspective. Study 2 replicated Study 1 and extended it to the perpetrator's perspective by demonstrating that the relationship between passion and ORI is mediated by fear of abandonment. Study 3 replicated these findings using an experimental manipulation of passion. Study 4 found similar results by experimentally manipulating fear of abandonment, the mediator, to demonstrate its causal influence on ORI.Conclusions: Taken together, the present results demonstrate that passion and fear of abandonment play an important role in the type of behavior people are willing to pursue to maintain their romantic relationship.

BACKGROUND The rapid advancement of electronic health (eHealth) and mobile health (mHealth) technologies has driven researchers to design and evaluate numerous technology-based interventions to promote smoking cessation. The evolving nature of cessation interventions emphasizes a strong need for knowledge syntheses. OBJECTIVE This systematic review and meta-analysis aims to (1) summarize recent evidence from randomized controlled trials (RCTs) regarding the effectiveness of eHealth-based smoking cessation interventions in promoting abstinence; and (2) assess non-abstinence outcome indicators, such as cigarette consumption and user satisfaction, via narrative synthesis. METHODS We searched for studies published in English between 2017 to June 30, 2022 in four databases: PubMed (including MEDLINE), PsycINFO, Embase, and Cochrane Library. Two independent reviewers performed study screening, data extraction, and quality assessment based on the GRADE framework. We pooled comparable studies based on population, follow-up time, intervention, and control characteristics. Two researchers performed independent meta-analysis on smoking abstinence using the Sidik-Jonkman random-effects model and log Risk Ratio (log RR) as the effect measurement. For studies not included in the meta-analysis, the outcomes were synthesized narratively. RESULTS A total of 464 studies were identified through the initial database search after removing duplicates. Following screening and full-text assessments, we deemed 39 studies (n=37,341 participants) eligible for this review. Of these, 28 studies were shortlisted for the meta-analysis. According to the meta-analysis, SMS/App text messaging can significantly increase both short-term (3-month) abstinence (log RR=0.50, 95% CI 0.25 to 0.75, I2=0.72%) and long-term(6-month) abstinence (log RR=0.77, 95% CI 0.49 to 1.04, I2=8.65%), relative to minimal cessation support. The frequency of texting did not significantly influence treatment outcome. mHealth apps may significantly increase abstinence in short term (log RR=0.76, 95% CI 0.09 to 1.42, I2=88.02%) but not in long term (log RR=0.15, 95% CI -0.18 to 0.48, I2=80.06%) in contrast to less intensive cessation support. Additionally, personalized/interactive interventions showed a moderate increase in cessation for both the short-term (log RR= 0.62, 95% CI 0.30 to 0.94, I2= 66.50%) and long-term (log RR= 0.28, 95% CI 0.04 to 0.53, I2= 73.42%). In contrast, studies without any personalized or interactive feature found no significant impact. Finally, the treatment effect was similar between trials using biochemically verified or self-reported abstinence. Among studies reporting outcomes besides abstinence (n=20), a total of 11 studies reported significantly improved non-abstinence outcomes in cigarette consumption (3/14, 21.43%) or user satisfaction (8/19, 42.11%). CONCLUSIONS Our review of 39 RCTs found that recent eHealth interventions may promote smoking cessation, with mHealth being the dominant approach. Despite their success, the effectiveness of these interventions may diminish with time. The design of more personalized intervention designs could potentially benefit future studies. CLINICALTRIAL PROSPERO International Prospective Register of Systematic Reviews CRD42022347104

This research examines how the relationship between passion for an ideology and violent activism is magnified by the personal (vs. collective) loss of significance. In Study 1 (N = 238), the relationship between obsessive (but not harmonious) passion for the Republican Party and violent activism was moderated by personal (but not collective) loss of significance. Study 2 (N = 612) replicated these findings with an experimental manipulation of personal and collective loss of significance in a sample of Black Lives Matter supporters. In Study 3 (N = 416), we set out to attenuate the obsessive passion-violent activism relationship by experimentally manipulating personal and collective significance gain. Echoing the results of Studies 1 and 2, the manipulation of personal (but not collective) significance gain reduced the relationship between obsessive passion for the environmental cause and violent activism. Furthermore, Study 3 examined the psychological mechanism at play by incorporating a measure of goal-shielding - a factor of theoretical relevance to explain extreme behaviour. Personal significance gain reduced individuals' proclivity to inhibit goals unrelated to their ideological pursuit, which in turn reduced their support for violent activism. These findings reveal psychological factors relevant to detecting at-risk individuals and implementing cost-effective prevention programmes against ideological violence.

This paper makes a case for explaining diversity effects through cognitive factors as compared to demographic or other differences in backgrounds. We argue that studying perceived diversity in conjunction with diversity beliefs can explain positive and negative effects through a motivated opening or closing of the mind (Need for Cognitive Closure, NFCC). NFCC is the motivation to avoid uncertainty and ambiguity. In Study 1, we experimentally demonstrate that asking participants to think about differences among their coworkers increases their NFCC. Study 2 shows that greater uncertainty about social norms in the workplace is positively related to NFCC. Study 3 confirms the mediating role of NFCC in explaining divergent thinking attitudes in expatriates working in various multicultural cities around the world. Study 4 demonstrates that perceived diversity is positively associated with NFCC when people hold negative beliefs about diversity, whereas positive beliefs mitigate this effect. Lastly, Study 5 shows that the interaction between perceived diversity and diversity beliefs is further moderated by task type. Taken together, the present research highlights the importance of studying cognitive factors to explain diversity effects.

This research examines how social networks contribute to the process of radicalization, building on work showing that obsessive (vs. harmonious) passion for a cause is linked to greater support for political violence. Study 1 ( N = 331) shows that obsessive (vs. harmonious) passion is related to affiliating with radical (vs. moderate) social networks, which in turn is associated with support for political violence. Study 2 ( N = 381) provides experimental evidence for this phenomenon, by showing that inducing an obsessive mindset produces a greater proclivity to connect with radical activists, which in turn is associated with greater support for political violence. Drawing from social network analysis, Study 3 ( N = 366) shows that network density intensifies obsessively passionate individuals’ affiliation to radical networks. The results offer insight into the group processes behind radicalization across different cultural contexts and ideologies.

Before vaccines for coronavirus disease 2019 (COVID-19) became available, a set of infection-prevention behaviors constituted the primary means to mitigate the virus spread. Our study aimed to identify important predictors of this set of behaviors. Whereas social and health psychological theories suggest a limited set of predictors, machine-learning analyses can identify correlates from a larger pool of candidate predictors. We used random forests to rank 115 candidate correlates of infection-prevention behavior in 56,072 participants across 28 countries, administered in March to May 2020. The machine-learning model predicted 52% of the variance in infection-prevention behavior in a separate test sample—exceeding the performance of psychological models of health behavior. Results indicated the two most important predictors related to individual-level injunctive norms. Illustrating how data-driven methods can complement theory, some of the most important predictors were not derived from theories of health behavior—and some theoretically derived predictors were relatively unimportant. New York University Abu Dhabi Revisión por pares

The present paper examines longitudinally how subjective perceptions about COVID-19, one’s community, and the government predict adherence to public health measures to reduce the spread of the virus. Using an international survey (N = 3040), we test how infection risk perception, trust in the governmental response and communications about COVID-19, conspiracy beliefs, social norms on distancing, tightness of culture, and community punishment predict various containment-related attitudes and behavior. Autoregressive analyses indicate that, at the personal level, personal hygiene behavior was predicted by personal infection risk perception. At social level, social distancing behaviors such as abstaining from face-to-face contact were predicted by perceived social norms. Support for behavioral mandates was predicted by confidence in the government and cultural tightness, whereas support for anti-lockdown protests was predicted by (lower) perceived clarity of communication about the virus. Results are discussed in light of policy implications and creating effective interventions.

The coronavirus disease 2019 (COVID-19) pandemic has caused a global health crisis. Consequently, many countries have adopted restrictive measures that caused a substantial change in society. Within this framework, it is reasonable to suppose that a sentiment of societal discontent, defined as generalized concern about the precarious state of society, has arisen. Literature shows that collectively experienced situations can motivate people to help each other. Since societal discontent is conceptualized as a collective phenomenon, we argue that it could influence intention to help others, particularly those who suffer from coronavirus. Thus, in the present study, we aimed (a) to explore the relationship between societal discontent and intention to help at the individual level and (b) to investigate a possible moderating effect of societal discontent at the country level on this relationship. To fulfil our purposes, we used data collected in 42 countries (N = 61,734) from the PsyCorona Survey, a cross-national longitudinal study. Results of multilevel analysis showed that, when societal discontent is experienced by the entire community, individuals dissatisfied with society are more prone to help others. Testing the model with longitudinal data (N = 3,817) confirmed our results. Implications for those findings are discussed in relation to crisis management. Please refer to the Supplementary Material section to find this article's Community and Social Impact Statement. New York University Abu Dhabi

We propose and demonstrate in 11 studies, including more than 4,700 observations, that the persuasiveness of a target message can be increased by the inclusion of a reactance decoy. A reactance decoy is a persuasive message presented before the target message and includes an attitude measurement toward the decoy object. The effect can be explained with reactance theory: The decoy message is presented to create reactance and expressing their attitude toward the decoy object gives participants the opportunity to vent, that is, to reestablish their threatened freedom. This reduces reactance toward the subsequently presented target message, positively influences participants' willingness to buy the target object (Studies 1, 4a and 4b, 7, and 8), their attitudes toward it (4a and 4b, 5, 7, and 8), their willingness to pay (Study 7), as well as behavioral measures such as time spent looking at the target object description (Study 7) and paying money to enter a raffle for the chance to win the target object (Studies 5 and 6). Moreover, forewarning participants of the persuasive intent of a subsequent message produced greater reactance, which was then vented on the decoy, and in turn increased the valuation of the target object (Study 1). By interchanging the products used as decoy or target objects, we also demonstrate experimentally that the reactance decoy effect occurs independently of the concrete stimuli being used (Study 3). In sum, the reactance decoy effect is a new theoretical framework that also bears important practical applications for many areas of social influence. (PsycInfo Database Record (c) 2020 APA, all rights reserved).

Objective: This research examines the interface between ideological passion and the dark tetrad personality traits to predict violent (vs. peaceful) political activism. Meta-analytic research shows that ideological obsessive passion (OP) is one of the strongest psychological factors associated with violent activism. Here, we examine whether this relationship is magnified by the dark tetrad (i.e., Machiavellianism, narcissism, psychopathy, and sadism), which have often been associated with antisocial behavior. Method: In Studies 1A–C, the interaction between ideological passion and the dark tetrad was tested cross-sectionally with three distinct ideological groups, namely, Democrats (N = 566), Republicans (N = 479), and Black Lives Matter supporters (N = 204). In Study 2, we tested the same model using an experimental manipulation of obsessive (vs. harmonious) passion in a sample of environmentalists (N = 233). Results: In Studies 1A–C, the relationship between OP and violent activism was systematically accentuated by sadism. Of note, these effects were specific to violent activism and unrelated to peaceful activism. In Study 2, we replicated these findings and showed that the relationship between sadism and violent activism was significant when individuals were in an obsessively (but not harmoniously) passionate mindset. Conclusion: These results shed light on the interplay between motivation and personality traits to predict violent activism. (PsycInfo Database Record (c) 2022 APA, all rights reserved)

El texto completo de este trabajo no está disponible en el Repositorio Académico UPC por restricciones de la casa editorial donde ha sido publicado. Understanding the determinants of COVID-19 vaccine uptake is important to inform policy decisions and plan vaccination campaigns. The aims of this research were to: (1) explore the individual- and country-level determinants of intentions to be vaccinated against SARS-CoV-2, and (2) examine worldwide variation in vaccination intentions. This cross-sectional online survey was conducted during the first wave of the pandemic, involving 6697 respondents across 20 countries. Results showed that 72.9% of participants reported positive intentions to be vaccinated against COVID-19, whereas 16.8% were undecided, and 10.3% reported they would not be vaccinated. At the individual level, prosociality was a significant positive predictor of vaccination intentions, whereas generic beliefs in conspiracy theories and religiosity were negative predictors. Country-level determinants, including cultural dimensions of individualism/collectivism and power distance, were not significant predictors of vaccination intentions. Altogether, this study identifies individual-level predictors that are common across multiple countries, provides further evidence on the importance of combating conspiracy theories, involving religious institutions in vaccination campaigns, and stimulating prosocial motives to encourage vaccine uptake.

There is an error in affiliation 54 for author Adil Samekin. The correct affiliation 54 is: School of Liberal Arts, M. Narikbayev KAZGUU University, Nur-Sultan, Kazakhstan.

Tightening social norms is thought to be adaptive for dealing with collective threat yet it may have negative consequences for increasing prejudice. The present research investigated the role of desire for cultural tightness, triggered by the COVID-19 pandemic, in increasing negative attitudes towards immigrants. We used participant-level data from 41 countries (N = 55,015) collected as part of the PsyCorona project, a cross-national longitudinal study on responses to COVID-19. Our predictions were tested through multilevel and SEM models, treating participants as nested within countries. Results showed that people's concern with COVID-19 threat was related to greater desire for tightness which, in turn, was linked to more negative attitudes towards immigrants. These findings were followed up with a longitudinal model (N = 2,349) which also showed that people's heightened concern with COVID-19 in an earlier stage of the pandemic was associated with an increase in their desire for tightness and negative attitudes towards immigrants later in time. Our findings offer insight into the trade-offs that tightening social norms under collective threat has for human groups., Graphical abstract Image, graphical abstract

Significance Attachment theory focuses on the primal form of emotional bonding between humans. Attachment is conceptualized as an innate behavioral system aimed at safeguarding against potential threats by assuring proximity to caring and supportive others. When individuals feel securely attached (thus feeling less threatened in most situations), the activation of the caregiving behavioral system (concern for others) is facilitated. With this research, we show that priming attachment security influences how much people care about and accept climate change via an increased empathy for humanity. Furthermore, we demonstrate that this activation bypasses the resistance of politically conservative individuals to mitigate climate change. Overall, we show that attachment security–based stimuli can inform intervention and policymaking strategies to help fight climate change., Attachment theory is an ethological approach to the development of durable, affective ties between humans. We propose that secure attachment is crucial for understanding climate change mitigation, because the latter is inherently a communal phenomenon resulting from joint action and requiring collective behavioral change. Here, we show that priming attachment security increases acceptance (Study 1: n = 173) and perceived responsibility toward anthropogenic climate change (Study 2: n = 209) via increased empathy for others. Next, we demonstrate that priming attachment security, compared to a standard National Geographic video about climate change, increases monetary donations to a proenvironmental group in politically moderate and conservative individuals (Study 3: n = 196). Finally, through a preregistered field study conducted in the United Arab Emirates (Study 4: n = 143,558 food transactions), we show that, compared to a message related to carbon emissions, an attachment security–based message is associated with a reduction in food waste. Taken together, our work suggests that an avenue to promote climate change mitigation could be grounded in core ethological mechanisms associated with secure attachment.

No consensus exists regarding which are the most effective mechanisms to promote household action on climate change. We present a meta-analysis of randomised controlled trials comprising 3,092,678 observations, which estimates the effects of behavioural interventions holding other factors constant. Here we show that behavioural interventions promote climate change mitigation to a very small degree while the intervention lasts (d = −0.093 95% CI −0.160, −0.055), with no evidence of sustained positive effects once the intervention ends. With the exception of recycling, most household mitigation behaviours show a low behavioural plasticity. The intervention with the highest average effect size is choice architecture (nudges) but this strategy has been tested in a limited number of behaviours. Our results do not imply behavioural interventions are less effective than alternative strategies such as financial incentives or regulations, nor exclude the possibility that behavioural interventions could have stronger effects when used in combination with alternative strategies., It is not clear which are the most effective mechanisms to achieve sustainable lifestyle behaviour. Here the authors study the impact of behavioural interventions excluding economic incentives by performing a large-scale meta-analysis and find that these interventions promote sustainable behaviours to a small degree in the short-term with no evidence of sustained positive effects once the intervention is completed.

The psychological mechanisms that lead terrorists to make costly sacrifices for their ideological convictions are of great theoretical and practical importance. We investigate two key components of this process: (1) the feeling of admiration toward ingroup members making costly self-sacrifices for their ideological group, and (2) identity fusion with religion. Data collected in 27 Spanish prisons reveal that jihadists’ admiration toward members of radical Islamist groups amplifies their willingness to engage in costly sacrifices for religion in prison. This effect is produced because admiration toward radical Islamist groups has a binding effect, increasing identity fusion with religion. Five additional experiments provide causal and behavioural evidence for this model. By showing that admiration for ingroup members increases identity fusion, which in turn makes individuals prone to engage in costly pro-group behaviours, we provide insights into the emotional machineries of radicalization and open new avenues for prevention strategies to strengthen public safety.

Food waste at the consumer level poses a global challenge for natural resources management and contributes to climate change. However, there is limited evidence regarding the best messaging strategies to fight household food waste. Here we experimentally test several food waste messages, aiming to identify the most effective strategies to promote individuals’ willingness to tackle food waste in the future (sampling 2500 U.S. residents). Study 1 tested three common prompts (“reduce waste”, “don’t waste” or “stop waste”) and showed that prompts to “reduce waste” are the most effective. Study 2 tested several consequences of food waste (economic, social or environmental), showing that messages about social and environmental consequences are the more impactful. Lastly, Study 3 tested whether combining different stimuli (prompts, consequences, tips for action) would produce stronger effects, but revealed mixed results, suggesting that more information is not necessarily better to help fight food waste. Implications for policy-making and intervention are discussed.

This paper examines whether compliance with COVID-19 mitigation measures is motivated by wanting to save lives or save the economy (or both), and which implications this carries to fight the pandemic. National representative samples were collected from 24 countries (N=25,435). The main predictors were (i) perceived risk to contract coronavirus, (ii) perceived risk to suffer economic losses due to coronavirus, and (iii) their interaction effect. Individual and country-level variables were added as covariates in multilevel regression models. We examined compliance with various preventive health behaviors and support for strict containment policies. Results show that perceived economic risk consistently predicted mitigation behavior and policy support - and its effects were positive. Perceived health risk had mixed effects. Only two significant interactions between health and economic risk were identified – both positive. These results do not corroborate the view that people engage in health versus economy zero-sum thinking in the fight against COVID-19.

Previous studies suggested that public trust in government is vital for implementations of social policies that rely on public's behavioural responses. This study examined associations of trust in government regarding COVID-19 control with recommended health behaviours and prosocial behaviours. Data from an international survey with representative samples (N=23,733) of 23 countries were analysed. Specification curve analysis showed that higher trust in government was significantly associated with higher adoption of health and prosocial behaviours in all reasonable specifications of multilevel linear models (median standardised β=0.173 and 0.244, P

Attachment is an ethological approach to the development of durable affective ties between humans. We propose that secure attachment is crucial to understand climate change mitigation because the latter is inherently a communal phenomenon resulting from joint action, and requiring collective behavioral change. Here we show that secure (vs. insecure) attachment is associated with a higher willingness to pay taxes and prices to mitigate climate change (Study 1 N=1006 U.S. nationally representative sample). We also establish that priming attachment security increases acceptance (Study 2 N=173) and perceived responsibility about anthropogenic climate change (Study 3 N=209). Next, we show that priming attachment security, compared to a standard National Geographic video about climate change, increases monetary donations to a proenvironmental group in politically moderate and conservative individuals (Study 4 N=196). Lastly, in a preregistered field study conducted in the United Arab Emirates involving 130 nationalities (Study 5 N=143,558 food transactions), we show that an attachment-based message reduces food waste compared to a message related to carbon emissions. Our work suggests that a new avenue to promote climate change mitigation could be grounded in core ethological mechanisms associated with secure attachment.

The purpose of this research is to experimentally test whether counter-narratives are effective to reduce people's support and willingness to join Islamic State of Iraq and Syria (ISIS). Integrating psychological reactance theory (Brehm, 1966) and need for closure (NFC; Kruglanski, 2004), we predicted that exposing people to counter-narratives when they are at greater risk of radicalization (high NFC individuals) would be counterproductive and enhance their support for ISIS. Participants (N = 886 American Muslims) were randomly assigned to a 3 × 3 factorial experimental design varying the source (United States Government, Imam, ISIS defector), and the content (social, political, and religious) of the counter-narrative while comparing these groups to a control message. Results show an overall small positive effect of counter-narratives (β = -0.107, p = 0.043), but also evidence for greater support for ISIS in individuals at greater risk of radicalization (β = 0.154, p = 0.005). Results also show that the content was more important than the source: A political narrative was the most effective, and this result is consistent across different sources although an ISIS defector is the most effective messenger. These findings challenge the widespread assumption that counter-narratives are effective against violent extremism. In fact, they accelerate the very phenomenon that governments and policy makers are trying to undermine. Therefore, policy makers should avoid including them in their armamentarium to tackle violent extremism.

No consensus exists regarding which are the most effective mechanisms to promote household action on climate change. We present a meta-analysis of randomised controlled trials comprising 3,092,678 observations, which estimates the effects of behavioural interventions holding other factors constant. Here we show that behavioural interventions promote climate change mitigation to a very small degree while the intervention lasts (d = -0.093 95% CI -0.160, -0.055), with no evidence of sustained positive effects once the intervention ends. With the exception of recycling, most household mitigation behaviours show a low behavioural plasticity. The intervention with the highest average effect size is choice architecture (nudges) but this strategy has been tested in a limited number of behaviours. Our results do not imply behavioural interventions are less effective than alternative strategies such as financial incentives or regulations, nor exclude the possibility that behavioural interventions could have stronger effects when used in combination with alternative strategies.

Promoting healthy behavior is a challenge for public health officials, especially in the context of asking patients to participate in preventive cancer screenings. Small financial incentives are sometimes used, but there is a little scientific basis to support a compelling description of the best-practice implementation of such incentives. We present a simple behavioral strategy based on mental accounting from prospect theory that maximizes the impact of incentives with no additional cost. We show how the partition of one incentive into two smaller incentives of equivalent total amount produces substantial behavioral changes, demonstrated in the context of colorectal cancer screening. In a randomized controlled trial, eligible patients aged 50-74 (n = 1652 patients) were allocated to receive either one €10 incentive (upon completion of screening) or two €5 incentives (at the beginning and at the end of screening). We show that cancer screening rates were dramatically increased by partitioning the financial incentive (61.1%), compared with a single installment at the end (41.4%). These results support the hedonic editing hypothesis from prospect theory, and underline the importance of implementing theoretically grounded healthcare interventions. Our results suggest that, when patient incentives are feasible, healthcare procedures should be framed as multistage events with smaller incentives offered at multiple points in time.

The psychological determinants of place attachment have thus far been explored only to a limited extent. We propose that the bonds humans develop with other humans (attachment styles) are consequential to understand the bonds individuals develop with places and spaces (place attachment). We examined this hypothesis in four studies. Study 1 (N = 101) shows that attachment style is associated with the number of places people are attached to, their location, and the strength of place attachment. Study 2 (N = 210) shows that the psychological benefits individuals derive from place attachment are associated with their attachment style. Study 3 (N = 222) establishes the causal effect between secure attachment style and place attachment using an experimental manipulation. The manipulation induced attachment security, which increased strength of place attachment, particularly in individuals with insecure attachment styles. Lastly, Study 4 (N = 212) replicates this experimental effect and shows that increased feelings of connectedness and universality mediate the causal relationship between secure attachment style and place attachment.

Adventure and excitement have often been invoked to explain why people engage in political violence, yet empirical evidence on the topic has thus far been anecdotal. The present research sought to fill this gap in knowledge by examining the role of sensation seeking in political violence and integrating this concept with Significance Quest Theory (Kruglanski, Chen, Dechesne, Fishman, & Orehek, 2009; Kruglanski et al., 2013). Extending prior research on violent extremism, Study 1 found that sensation seeking mediated the relation between meaning in life and willingness to self-sacrifice and support for political violence. Study 2 established temporal precedence of the variables in the mediation model, using a longitudinal design. Studies 3 and 4 experimentally replicated findings of Studies 1 and 2. In Studies 5a and 5b, we found that sensation seeking predicts support for a real life violent activist group. In Studies 6a and 6b, the positive evaluation of a violent activist group by individuals high in sensation seeking was explained by how exciting they perceived the group to be. Finally, Study 7 introduced an intervention targeting the sensation seeking motive by presenting participants with a peaceful (less exciting vs. exciting) activism group. As hypothesized, providing individuals high in sensation seeking with a peaceful yet exciting group mitigated their support for extreme behavior. (PsycINFO Database Record (c) 2020 APA, all rights reserved)

Objective People that pursue a passionate activity obsessively (vs. harmoniously) tend to neglect (vs. integrate) other important life domains, yet research has been silent on the psychological mechanism explaining these differences in self-regulation. The purpose of this research was to address this gap by testing the role of alternative goal suppression. Method Four studies tested whether harmonious passion is characterized by the pursuit of multifinality, the preference for means that gratify multiple goals simultaneously, whereas obsessive passion is characterized by the pursuit of counterfinality, the preference for means that serves a focal goal to the detriment of other pursuits. Underlying this relationship is the tendency to suppress goals conflicting with one's passion. Results Study 1 found cross-sectional support for these hypotheses. Study 2 replicated Study 1 and extended it by demonstrating that the relationship between obsessive passion and counterfinal means is mediated by alternative goal suppression. Study 3 replicated these findings using an experimental manipulation of passion. Study 4 found similar results by experimentally manipulating alternative goal suppression, the mediator, to demonstrate its causal influence on means evaluation. Conclusions Collectively, the present results demonstrate that passion plays a significant role in the type of means-ends relations preferred for goal pursuits.

We present a simple behavioral strategy based on Prospect Theory that maximizes the impact of financial incentives with no additional cost. We show how the partition of a single incentive into two smaller incentives of equivalent total amount produces substantial behavioral changes, here demonstrated in the context of colorectal cancer screening. In a randomized controlled trial, eligible patients aged 50-74 (N=1652 patients) were allocated to receive either one EUR10 incentive (upon completion of screening) or two EUR5 incentives (at the beginning and at the end of screening). We show that cancer screening rates were dramatically increased by partitioning the financial incentive (61.1%), compared to offering a single installment at the end (41.4%). These results support the hedonic editing hypothesis from Prospect Theory and underline the importance of implementing theoretically grounded healthcare interventions. Our results suggest that, when patient incentives are feasible, they should not be offered at once, but rather healthcare procedures should be framed as multistage events with smaller incentives offered at multiple points in time.

No consensus exists regarding which are the most effective mechanisms to promote household action on climate change. We present a meta-analysis of randomised controlled trials comprising 3,092,678 observations, which estimates the effects of behavioural interventions holding other factors constant. Here we show that behavioural interventions promote climate change mitigation to a very small degree while the intervention lasts (d=-0.093 95% CI -0.160, -0.055), with no evidence of sustained positive effects once the intervention ends. With the exception of recycling, most household mitigation behaviours show a low behavioural plasticity. The intervention with the highest average effect size is choice architecture (nudges) but this strategy has been tested in a limited number of behaviours. Our results do not imply behavioural interventions are less effective than alternative strategies such as financial incentives or regulations, nor exclude the possibility that behavioural interventions could have stronger effects when used in combination with alternative strategies.

Although diversity has been attested the potential to increase positive outcomes such as creativity and innovation, the current paper explores its adverse effects. In seven studies, we showed that ...