Smartphones have become an indispensable part of our daily lives due to their connectivity and portability. The number of Chinese mobile internet users has reached 1.067 billion, increasing by 35.49 million in a year as of December 2022 (China Internet Network Information Center, 2023). China has the highest rates in smartphone addiction among the 24 countries according to a meta-analysis (Olson et al., 2022). With the prevalence of smartphones, adolescents’ smartphone addiction has also become a major concern. About 80% of Chinese adolescents own smartphones and nearly 40% of them use smartphones without restrictions, and 22.8% of adolescents are addicted to smartphones (Gong et al., 2022; Wang et al., 2019). Smartphone addiction is also called “problematic smartphone use”, which is defined as a behavior characterized by excessive use of smartphones and excessive psychological attachment on smartphones (Lapierre et al., 2019). Importantly, smartphone addiction is related to many negative psychological consequences such as learning burnout, anxiety, and depression (Wang et al., 2023; Busch & McCarthy, 2021). Therefore, it is of theoretical and practical importance to explore the factors that may contribute to adolescents’ smartphone addiction. Previous research has demonstrated that shyness significantly affects adolescents’ smartphone addiction (Hong et al., 2019). However, little is known about the mediating and moderating mechanisms underlying this association. Therefore, the present study aimed to replicate the association between shyness and adolescents’ smartphone addiction and extend previous studies by investigating the mediating effects of maladaptive cognitive emotion regulation strategies and experiential avoidance and the moderating effect of online social support in this relationship.
Shyness and adolescents’ smartphone addiction
Shyness reflects a person’s nervous and embarrassed reactions to strangers or acquaintances in social situations, as well as worry and discomfort when faced with a new social environment and social evaluation (Rubin et al., 2009). Shyness is especially prominent during adolescence (Hassan et al., 2021b) and adolescents in East Asia are more likely to be shy and anxious in stressful setting than adolescents in the West (Kong et al., 2022; Chen et al., 2019). Shyness significantly increases adolescences’ susceptibility to smartphone addiction (Hong et al., 2019). According to social compensation theory, adolescents with high shyness use their smartphones more frequently to compensate for their anxiety in real interactions (Desjarlais & Willoughby, 2010). Specifically, shy adolescents choose to avoid social engagement (Coplan et al., 2021). However, network environment provides a secure virtual space for shy adolescents to communicate, enhancing their comfort and social control without the fear of evaluation (Tian et al., 2017). Shy adolescences who rely too much on the compensation of the smartphones without restraint are more likely to develop into smartphone addiction. Consistent with this view, previous studies have demonstrated that shyness is a powerful predictor of smartphone addiction (Hong et al., 2019; Ang et al., 2018). A longitudinal study also indicates that shyness positively predicts adolescents’ internet addiction after 12 months (Tian et al., 2021). Therefore, we assumed that shyness would be a significant risk factor for adolescents’ smartphone addiction.
The mediating role of maladaptive cognitive emotion regulation strategies
Maladaptive cognitive emotion regulation strategies refer to negative cognitive strategies for responding to stressful events and processing emotionally arousing information, including rumination, catastrophizing, self-blame, and blaming others (Garnefski et al., 2001). There is evidence that maladaptive emotion regulation strategies have a conspicuous role in developing internet addiction (Guo et al., 2023). The interaction of person-affect-cognition-execution (I-PACE) model can be used to explain the mediating role of maladaptive cognitive emotion regulation strategies in the relationship between shyness and smartphone addiction (Brand et al., 2019). This model suggests that internet addiction is the result of the effects of a person’s characteristics, affective and cognitive responses, and executive functions. In the process, affective and cognitive responses are considered to mediate the relationship between psychological characteristics and internet addiction. Specifically, shy adolescents are more likely to adopt maladaptive cognitive emotion regulation strategies, but such strategies fail to deal with stressful events and release negative emotions (Zhang et al., 2022). Understandably, adolescents then bury themselves in smartphones to escape from reality and alleviate anxiety (Zsido et al., 2021).
To our knowledge, no previous studies have examined whether maladaptive cognitive emotion regulation strategies would mediate the relationship between shyness and smartphone addiction. Although there is less direct evidence to support the mediating effect of maladaptive cognitive emotion regulation strategies, some indirect evidence supports this mediating effect. First, shyness positively impacts maladaptive cognitive emotion regulation strategies. Previous empirical research has supported this view. For instance, shy children tend to use maladaptive coping styles in stressful social settings (Ding et al., 2014; Markovic et al., 2013). Likewise, shyness is associated with poorer emotion regulation in adolescence (Hassan et al., 2021b). Moreover, shyness influences undergraduate students’ internet use through the mediating effect of maladaptive cognitions (Tian et al., 2017). Second, maladaptive cognitive emotion regulation strategies significantly and positively predict smartphone addiction (Elhai et al., 2018). For instance, maladaptive cognitive emotion regulation strategies are positively associated with smartphone addiction among adolescents and adults (Guo et al., 2023; Zsido et al., 2021). Moreover, maladaptive emotion regulation strategies trigger adolescents’ internet gaming addiction (Zhou et al., 2023; Wu et al., 2022). Thus, it is reasonable to expect that maladaptive cognitive emotion regulation strategies would mediate the relationship between shyness and adolescents’ smartphone addiction.
The mediating role of experiential avoidance
Experiential avoidance is defined as reluctance to stay in contact with unpleasant internal experiences (emotions, thoughts, memories and physical feelings) coupled with reactions to reduce the frequency or effect of these distressing experiences (Hayes et al., 2006). Based on the social adaptation model (Henderson & Zimbardo 1999), shy adolescents hold the negative cognition of the environment and others and they tend to avoid social situations. Although experiential avoidance helps adolescents succeed in alleviating initial discomfort, it’s rebound effect probably ultimately magnifies negative emotions and further exacerbating experiential avoidance patterns (Hayes et al., 1996). In this sense, adolescents are more likely to use their smartphones to avoid real-life problems or to relieve negative feelings according to social compensation theory (Desjarlais & Willoughby, 2010). Therefore, there is theoretical reason for expecting the mediating role of experiential avoidance in the link between shyness and smartphone addiction. In the following section, this view would be supported by some indirect evidence.
First, shyness is motivation of social withdrawal (Coplan et al., 2021). That is, shyness is expressed as avoidance, inhibition and/or withdrawn behaviors in social situation (Baardstu et al., 2022; Tang et al., 2017). Consistent with this view, shyness is positively associated with adolescents’ avoidance (Hassan et al., 2021a; Eggum-Wilkens et al., 2020). Second, experiential avoidance positively predicts adolescents’ smartphone addiction. Adolescents addicted to online games have high emotion avoidance and experiential avoidance plays an important role in developing internet addiction (Ahmed et al., 2022; Chou et al., 2017). Results from longitudinal studies also support that avoidance is positively associated with adolescents’ smartphone addiction and problematic internet use (Lin, 2022; Cheng et al., 2015). Furthermore, a systematic literature review based on 26 empirical studies has shown that avoidance coping is a predictor of problematic online gaming (Melodia et al., 2020). Consequently, it is reasonable to expect that experiential avoidance would mediate the association between shyness and adolescents’ smartphone addiction.
The multiple mediation model
The current study would form a multiple mediation model to simultaneously examine the mediating roles of both maladaptive cognitive emotion regulation strategies and experiential avoidance in the relationship between shyness and smartphone addiction. There are three hypotheses about the mediation model. The first hypothesis is the parallel mediation model. Maladaptive cognitive emotion regulation strategies are one reason for developing smartphone addiction and experiential avoidance is another reason for smartphone addiction (Zsido et al., 2021; Tian et al., 2017; Chou et al., 2017). The second hypothesis is the sequential mediation model. Individuals accustomed to adopt maladaptive cognitive emotion regulation strategies are more likely to avoid unpleasant experiences (Kashdan et al., 2006). Maladaptive cognitive emotion regulation strategies are positively associated with adolescents’ experiential avoidance (Venta et al., 2013). This argument is consistent with the interaction of person-affect-cognition-execution model (Brand et al., 2019). In other words, smartphone addiction results from the effects of shyness, maladaptive cognitive emotion regulation strategies, and experiential avoidance. In this sense, the link between shyness and smartphone addiction would be mediated sequentially by maladaptive cognitive emotion regulation strategies and experiential avoidance. The third hypothesis is the mixed mediation model. It means that the link between shyness and smartphone addiction is mediated by maladaptive cognitive emotion regulation strategies and experiential avoidance in both parallel and sequential fashion. Given the above previous studies, we proposed that mediators of maladaptive cognitive emotion regulation strategies and experiential avoidance would work by a way of the third hypothesis.
The moderating role of online social support
Although shyness may increase the risk of smartphone addiction through the mediating roles of maladaptive cognitive emotion regulation strategies and experiential avoidance, not all shy adolescents homogeneously display high levels of smartphone addiction. Heterogeneity of outcomes may originate from potential moderating variables. Therefore, the present study would examine whether the direct and indirect links between shyness and smartphone addiction via maladaptive cognitive emotion regulation strategies and experiential avoidance would be moderated by online social support.
Online social support refers to the sense of identity and belonging that individuals feel during a process of emotion, information, and material exchange in online interpersonal interactions (Zheng et al., 2021). Shy adolescents perceive less social support in social situation (Appel & Gnambs, 2019). The emotional needs of shy adolescents to maintain social relationships with others can prompt them to seek online social support (Brailovskaia et al., 2019). Additionally, there are considerable studies that consistently indicate online social support promotes psychological dependence on social media use (Fang et al., 2020b; Brailovskaia et al., 2019; Mazzoni et al., 2016). According to the buffering model of social support (Cohen & Wills, 1985), social support is used as a protective factor to buffer the influence of cognitive system on behavioral system and promote the psychological development of individuals. Online social support has two types of moderation patterns: the risk-buffering model and the reverse risk-buffering model (Fang et al., 2020a). In other words, online social support can buffer or strengthen the negative effect of risk factors. For instance, Cole et al. (2017) suggest that online social support attenuates the adverse effects of peer victimization on depressive thoughts, whereas Fang et al. (2020a) find that online social support exacerbates the pernicious effects of cybervictimization on rumination. These two empirical studies support the risk-buffering and reverse risk-buffering roles of online social support, respectively.
To our knowledge, no research has examined how shyness and online social support interact to influence adolescents’ smartphone addiction. On the one hand, online social support is a protective factor that may attenuate the negative impact of shyness on adolescents’ smartphone addiction. On the other hand, online social support may exacerbate the association between shyness and smartphone addiction. Consequently, the current study explored whether risk-buffering model or reverse risk-buffering model of online social support would be more applicable.
The current study
In summary, the purposes of the current study were to examine four questions. First, we aimed to test whether shyness would significantly and positively predict adolescents’ smartphone addiction. Second, we tested the mediators of maladaptive cognitive emotion regulation strategies and experiential avoidance in the relationship between shyness and adolescents’ smartphone addiction. Third, we established a multiple mediation model to examine the mixed mediating role of maladaptive cognitive emotion regulation strategies and experiential avoidance (Fig. 1). Fourth, we explored whether online social support would moderate the direct and indirect links between shyness and adolescents’ smartphone addiction.