Prosocial behavior (PB) refers to voluntary actions aiming to benefit others (Habashi, Graziano, & Hoover, 2016), such as helping, sharing, cooperating, donating, caring, and comforting. PB requires accurate perception and understanding of the desires of the victim, and proper decisions that meet the need of the victim. In the process of prosocial engagement theory of mind abilities and general cognitive abilities are greatly needed (Bekkers & Wiepking, 2011; Guo et al., 2019; Hur, 2020). The above reasoning suggests that smarter individuals are more likely to be prosocial, which has been supported by many studies. For example, verbal ability is found to be a good predictor of participation of charitable giving and the amount of donation, even after controlling for income, wealth, education, subjective health, and personality (Bekkers, 2006). Smarter people can be more generous in economic games (Millet & Dewitte, 2007). They tend to trust others, and thus are more likely to engage in prosocial actions (Hooghe et al., 2012). Aranda and Siyaranamual (2014) found that mathematical and verbal abilities were both positively associated with civic engagement (e.g., doing voluntary and charity work, engaging in political or community-related activities;Aranda & Siyaranamual, 2014). A meta-analysis of the repeated prisoner's dilemma game at multiple colleges showed that every 100-point improvement in a college's average SAT score (a proxy for cognitive abilities; Lincoln et al., 2016) averagely result in an improvement of the students' cooperation rate by 5% to 8% in that college (Jones, 2008). Millet and Dewitte (2007) argued that altruistic behavior can be considered by the participants as a costly signal of fitness. Altruistic behavior can convey desirable traits that cannot be directly observed, such as social status, generosity, kindness, and trustworthiness (Millet & Dewitte, 2007). Highly intelligence individuals are better in realizing the long-term benefits of PB, which may include good social prestige, more opportunities to be selected as a partner or mate. Therefore we propose Hypothesis 1: There is a positive correlation between intelligence and PB.
Empathy is an important driving force of prosocial engagement (Carlo & Randall, 2002). Witnessing the misfortune of victims elicit emotional responses such as pity and sympathy in the witness, which prompts helping behaviors to relieve suffering of the victims (Batson et al., 1991). Individuals with stronger theory of mind and perspective taking abilities are better in understanding the victim's thoughts and feelings and put themselves in the victim's position, and therefore tend to lend a helping hand (Hur, 2020). Empirical research shows that high intelligence individuals are sensitive to the thoughts and feelings of others, and are easier in generating other-centered feelings (Guo et al., 2019). The above arguments suggest that empathy can serve as a mediating mechanism in the relationship between intelligence and PB. Therefore we propose Hypothesis 2: the intelligence-prosociality association can be mediated by empathy.
Mindfulness can not only enhance well-being of the self but also benefit others (Donald et al., 2019). Meta-analysis studies found that mindfulness is positively associated with PB, regardless mindfulness was operated as a personal disposition, a state induced by experimental manipulation, or an ability enhanced by training (Donald et al., 2019). One reason is that mindfulness increases moral awareness or sensitivity to morally relevant information (Sevinc & Lazar, 2019; Shapiro et al., 2012; Xiao et al., 2020). Featured by openness and unbiased awareness, a mindful state can enhance sensitivity to morally relevant internal and external cues (Sevinc & Lazar, 2019). Mindfulness entails sustained attention, increasing the ability to be aware of the needs of others in the social environments. Another reason is that mindfulness is associated with improved emotion regulation ability, which can result in more prosocial engagement especially in situations that making a prosoical decision involves negative emotions (Donald et al., 2019). Furthermore, mindfulness facilitates more empathic responses by reducing self-referential thoughts and emotions, boosting the motivation to help the suffering others. Evidence shows that mindfulness trainees are more likely to help an ostracized stranger and socially include her/him in interpersonal interactions (Berry et al., 2020).
Previous research has suggested that mindfulness interacts with other important personal dispositions to influence psychosocial outcomes. For example, high (relative to low) trait mindfulness individuals can experience greater loss of self-control after performing surface acting (Lyddy et al., 2021). Also there is evidence showing that mindfulness and self-construal interact to influence PB (Poulin et al., 2021). Another recent study found that mindfulness intervention has a stronger effect on prosocial engagement among individuals with higher levels of moral identity (a moral disposition positively associated with intelligence; Guo et. al. 2019), suggesting that moral awareness or moral sensitivity is more likely to be enhanced by mindfulness training among Highly ethical individuals (Xiao et al., 2020). This suggests that mindfulness and intelligence may interact to influence PB. People with high intelligence can process environmental information more effectively. Therefore we propose that the association between intelligence and moral awareness can be enhanced when self-referential thoughts and emotions are reduced. That is, mindfulness can make high intelligence individuals more sensitive to moral issues and have more PB (Pandey et al., 2017). Thus we propose Hypothesis 3: the relationship between intelligence and PB can be enhanced by mindfulness.
There is no evidence in the existing literature on how the relationship between intelligence and empathy as well as between empathy and PB can be moderated by mindfulness. In this study we tentatively constructed a more complicated model (i.e., a moderated mediation model; Hayes, 2018) to make an exploration (Figure 1). Specifically, we assume that the relationships between intelligence and PB, intelligence and empathy, and empathy and PB may all be moderated by mindfulness.