Neuroticism, Trait Fear of Missing Out, and Phubbing: The Mediating Role of State Fear of Missing Out and Problematic Instagram Use

One of the relatively new negative consequences of smartphone use is “phubbing” (snubbing someone while an individual checks their smartphone in the middle of a real-life conversation). The purpose of the present study was to investigate the direct and indirect associations of neuroticism, trait anxiety, and trait fear of missing out with phubbing via state fear of missing out and problematic Instagram use. A total of 423 adolescents and emerging adults aged between 14 and 21 years (53% female) participated in the study. Findings indicated that females had significantly higher scores of phubbing, fear of missing out, problematic Instagram use, trait anxiety, and neuroticism. Path analysis showed that trait fear of missing out and neuroticism were indirectly associated with phubbing via state fear of missing out and problematic Instagram use. State fear of missing out was directly and indirectly associated with phubbing via problematic Instagram use. The present study is the first to demonstrate empirical evidence for the relationship between different dimensions of fear of missing out, problematic Instagram use, and phubbing.

Keywords Neuroticism . Anxiety . Fear of missing out . Problematic Instagram use . Phubbing With the increasing use of Internet applications such as social media, gaming, and gambling (Pontes et al. 2015) and the developments in mobile technologies, smartphones have become essential in individuals' everyday lives. Nowadays, smartphones are used for various reasons and uses other than simply making a call. Their introduction has led to widespread usage of smartphones worldwide. In 2018, 36% of all the people living in the world were smartphone users (Statista 2018a). In 2017, more than 50% of all the people living in Turkey (where the present study was carried out) were smartphone users and these numbers are expected to rise in the upcoming years (Statista 2018b).
With so many individuals using smartphones, research has demonstrated that a small minority of its users appear to experience problematic smartphone use (Billieux et al. 2015). Phubbing, which is a newly emerging phenomenon concerning smartphone use, has recently drawn attention from academics. The term Bphubbing^is derived from the words Bphone^and Bsnubbing,^and refers to individuals checking their smartphone in the middle of a real-life conversation with someone else and escaping from interpersonal communication (Karadağ et al. 2015). Phubbing can be considered a disrespectful behavior towards others and can damage real-life social relationships with others (Karadağ et al. 2015). It can have a direct negative impact on relationship satisfaction, and an indirect impact on life satisfaction and depression via relationship satisfaction (Roberts and David 2016), which may be explained by the heightened feelings of jealousy (Krasnova et al. 2016). Consequently, phubbing can be a problematic behavior that may harm both phubbers and those being phubbed (Chotpitayasunondh and Douglas 2016). Consequently, the personality and psychological risk factors that may lead to phubbing should be further examined.
Even though it is a relatively new phenomenon, different studies have investigated related factors and consequences of phubbing. To date, addictive use of technological mediums such as mobile phones, Internet, social media, games, and Facebook have been shown to increase phubbing (Błachnio and Przepiorka 2018;Karadağ et al. 2015). Gender has been shown to be a moderating variable with females engaging in phubbing more than males (Karadağ et al. 2015) and that phubbing may become a norm because of observed and personal behaviors. For instance, the social norms of phubbing have been associated with phubbing and being phubbed, while phubbing has been related to being phubbed (Chotpitayasunondh and Douglas 2016).
Despite the growing body of literature, little is known about the complex relationships of emotional and impulsive personality constructs such as trait anxiety and neuroticism in relation to phubbing. Moreover, even though phubbing has been assumed and speculated to emerge from fear of missing out (FoMO) in previous studies, no empirical study has ever demonstrated the relationship between phubbing and FoMO. Finally, despite the growing body of evidence concerning the impact of problematic smartphone use (including problematic social media use) on phubbing, the role of specific problematic social media use (i.e., Instagram) has yet to be empirically investigated. Given the theoretical models suggesting different risk factors and consequences for different types of specific Internet-use disorders (Brand et al. 2016), it is theoretically reasonable to expect problematic Instagram use (PIU) to have a unique effect on phubbing. Therefore, the present study investigates the direct and indirect associations of neuroticism, trait anxiety, and trait fear of missing out with phubbing via state fear of missing out and problematic Instagram use.

Neuroticism, Trait Anxiety, and Phubbing
Neuroticism is defined as Ba tendency to experience negative emotional states, accompanied by heightened anxiety or depression, anger and guilt, as well as increased tendency for somatization of psychological problems^ (Gonda et al. 2009;p. 107). Neurotic individuals have an overall anxious predisposition and tendency to worry (Mehroof and Griffiths 2010). Even though there is no empirical evidence (except the ones indicating an association between neuroticism and problematic smartphone use (Billieux et al. 2007)), given the emotionally unstable and impulsive nature, and lower self-control of individuals with higher neuroticism (Fetterman et al. 2010), it is theoretically reasonable to assume that neuroticism is associated with higher levels of phubbing.
Trait anxiety is defined as Bthe general tendency of an individual to be upset in stressful situations, or as the mean level of anxiety over a longer period^ (Demyttenaere et al. 1989;p. 943). Trait anxiety and neuroticism, which are highly overlapping constructs, are being considered similar personality constructs (Jorm 1989), and anxious individuals have consistently been shown to experience increased level of problematic smartphone use (Demirci et al. 2015). Therefore, it is expected that there will be a similar heightening effect on phubbing behavior arising from trait anxiety. The purpose of testing these similar constructs together is to be able to understand which of the two may better explain phubbing.

Fear of Missing Out and Phubbing
Fear of missing out is defined as Ba pervasive apprehension that others might be having regarding experiences from which one is absent^ (Przybylski et al. 2013;p. 1842). It is logical to assume that individuals experiencing higher levels of FoMO will harbor higher facets of personality constructs such as trait anxiety, neuroticism, irritability, inadequacy, and low selfesteem (Abel et al. 2016;Oberst et al. 2017). Despite the fact that FoMO is an emerging construct in a technological context, there has been a growing empirical literature investigating the role of this phenomenon on problematic online behaviors (Kuss and Griffiths 2017). Some of these studies have found that FoMO is associated with higher problematic smartphone and social media use (Chotpitayasunondh and Douglas 2016;Elhai et al. 2016;Oberst et al. 2017;Wegmann et al. 2017), which are also predictors of phubbing (Karadağ et al. 2015).
A recent study assumed that FoMO may be a more complex construct that could refer to a specific cognition such as an online fear of missing out rather than a unitary phenomenon . Therefore, they approached FoMO as a multi-dimensional construct that comprised dispositional trait-FoMO, which refers to a stable individual characteristic, and state-FoMO, which refers to a FoMO of online content and interactions with others . Moving from a recent theoretical model, state-FoMO was included into specific cognition category which may play a mediating role between trait-FoMO and problematic use of Internet applications (Brand et al. 2016). Consequently, the present study expected to find a mediating role of state-FoMO between the relationships of trait-FoMO, neuroticism, and trait anxiety with phubbing.

The Mediating Role of Problematic Instagram Use
Despite the growing body of Internet-use disorder literature (Kircaburun et al. 2018), very little is known about the risk factors and consequences of problematic Instagram use. Recent studies with university students found that problematic Instagram use is associated with lower selfliking, agreeableness and conscientiousness, watching live streams of others, leaving Blikes^and comments on others' posts, perceived feeling of presence, and escapism Griffiths 2018a, 2018b). It was argued in these studies that the relationship of watching live streams of others and leaving Blikes^and comments on others' posts with problematic Instagram use may be explained by the fear of missing out on recent developments of and interactions with peers. Moreover, the theoretical assumptions for individuals with higher emotional instability, impulsivity, irritableness, and anxiety to have increased levels of Internet-use disorders have been supported by empirical studies (Brand et al. 2016;Griffiths 2011, 2012). Therefore, it is reasonable to expect that neuroticism, trait anxiety, trait-FoMO, and state-FoMO will be associated with higher engagement in problematic Instagram use.
Additionally, and as previously mentioned, phubbing has been associated with addictions to social media, mobile phones, gaming, and the Internet (Karadağ et al. 2015), although specific role of problematic Instagram use is unknown. Obviously, it is logical to expect an augmenting effect from problematic Instagram use on phubbing, but it is still important to identify the specific contribution of problematic Instagram use and compare it with the role of other specific Internet-use disorders on phubbing because different applications and platforms may have different features and varied outcomes (Brand et al. 2016).

The Present Study
Based on the aforementioned studies and theoretical assumptions, the present study tested a complex model in which neuroticism, trait anxiety, and trait-FoMO were independent variables, state-FoMO and problematic Instagram use were mediator variables, and phubbing was the outcome variable. It was hypothesized that neuroticism, trait anxiety, and trait-FoMO would be positively directly and indirectly associated with phubbing via state-FoMO and problematic Instagram use, whereas state-FoMO would be positively directly and indirectly associated with phubbing via problematic Instagram use.

Participants
Participants were recruited using a mixed methods approach. The study was first promoted via social media groups and 121 individuals completed an online survey. Given the lower than expected number of participants, the same survey was administered (offline and in class) to students attending a high school and a state university in northern region of Turkey using paper-pencil questionnaires. The final sample comprised 423 Instagram users, aged between 14 and 21 years (M age = 17.15 years, SD = 2.24; 53% female). The only inclusion criterion for participation in the study was to have an active Instagram account. All of the participants gave their informed consent and took part the study voluntarily and anonymously.

Social Media Use Questionnaire
The Social Media Use Questionnaire (SMUQ) (Xanidis and Brignell 2016) assesses problematic use of social media and comprises nine items (e.g., BI feel anxious, when I am not able to check my social network account^) on a 5-point Likert scale from Bnever^to Balways,^with two factors (i.e., withdrawal and compulsion). In the present study, in order to assess problematic Instagram use, the SMUQ was used by replacing Bsocial media^with BInstagram.^Previous studies with the Turkish form reported optimal validity and reliability for the scale (Kircaburun and Griffiths 2018a, b). Cronbach's alphas for this and the other scales used in the present study are shown in Table 2.

Fear of Missing Out Scale
The Fear of Missing Out Scale (FoMOS) ) assesses different levels of fear of missing out, and comprises 12 items on a 5-point Likert scale from Bnever^to Balways,^with two factors: trait-FoMO (e.g., BI fear my friends have more rewarding experiences than me^) and state-FoMO (e.g., BI am continuously online in order not to miss out on anything^). The Turkish form of the scale was used for the first time in the present study. Therefore, confirmatory factor analysis (CFA) was applied for adaptation. According to CFA results (χ 2 /df = 3.80, RMSEA = .08 (CI 90% [.07, .09]), SRMR = .02, CFI = .93, GFI = .93), the scale was valid and reliable for assessing trait-FoMO and state-FoMO levels among Turkish participants. The internal consistency coefficients of the subscales were also high (.78, .85).

The Phubbing Scale
The Phubbing Scale (TPS) (Karadağ et al. 2015) comprises 10 items on a 5-point Likert scale from Bnever^to Balways,^with two factors (five items for each factor): communication disturbances (e.g., BMy eyes start wandering on my phone when I'm together with others^) and phone obsession (e.g., BWhen I wake up in the morning, I first check the messages on my phone^). Previous studies have reported optimal validity and reliability of the scale (Karadağ et al. 2015).
Internal consistency values of the subscales were also high in the present study (.77, .79).

Neuroticism Subscale
The neurotic personality traits of the participants were assessed by using the neuroticism subscale of the Adjective Based Personality Scale (ABPT). ABPT-neuroticism comprises seven items on a 7-point Likert scale (Bacanlı, İlhan, & Aslan, 2009). Because the internal consistency value of the scale turned out to be low (.49), confirmatory factor analysis was applied. As a result of CFA, it was observed that Items 2, 3, 5, and 7 had unacceptable standardized regression weights (< .30) and squared multiple correlations (< .10). Consequently, these items were removed from the analyses. The final three-item structure (BI see myself as an impatient person,^BI see myself as a pessimistic person,^and BI see myself as a restless person^) indicated adequate validity and reliability of the reduced scale (.64).

State-Trait Anxiety Inventory Short Form
The State-Trait Anxiety Inventory Short Form (STAI-6) (Marteau and Bekker 1992) comprises six items (e.g., BI feel calm,^BI am worried^) on a 4-point Likert scale from Balmost never^to Balmost always.^Previous studies have reported optimal validity and reliability of the scale (Öner and Le Compte 1985). The present study used the Turkish translation of the original 20item version of the STAI (Le Compte and Oner 1976).

Statistical Analysis
In order to analyze the data frequency and descriptive statistics, Pearson correlation tests, t-tests, confirmatory factor analyses, and path analyses were applied using SPSS 23.0 and AMOS 23.0 software. In order to use path analysis or structural equation modeling, the sample size should be higher than 200 (Haenlein and Kaplan 2004;Nasser and Wisenbaker 2003). Total (direct and indirect) effects of independent and mediator variables on the outcome variable were calculated via using bootstrapping method with 5000 bootstrap samples and 95% bias-corrected confidence intervals. Finally, total, female and male samples were analyzed separately. In the CFA and path analyses, goodness of fit criteria determined by Hu and Bentler (1999) were used in order to designate model fit.

Results
Results of the t tests regarding the score differences across females and males are presented in Table 1. All study variables, except state-FoMO, differed significantly between female and male adolescents and emerging adults. Females had higher levels of phubbing, problematic Instagram use (PIU), trait-FoMO, neuroticism, and trait anxiety scores compared to males. Results of the mean scores, standard deviations, score ranges, Cronbach's alphas, and Pearson correlation coefficients are presented in Table 2. Problematic Instagram use, state-FoMO, and trait-FoMO were highly correlated with phubbing. Neuroticism and trait anxiety were weakly correlated with phubbing (Table 3).

Discussion
The present study investigated the direct and indirect associations between neuroticism, trait anxiety, and trait fear of missing out with phubbing via state-FoMO and FoMO, fear of missing out; *p < .05; **p < .01; ***p < .001; mean ± SD problematic Instagram use. According to the path analysis, (i) neuroticism was indirectly associated with phubbing via problematic Instagram use, (ii) trait-FoMO was indirectly associated with phubbing via state-FoMO and state-FoMO ➔ problematic Instagram use pathways, and (iii) state-FoMO was directly and indirectly associated with phubbing via problematic Instagram use. The results confirm the I-PACE model which asserts that an individuals' core characteristics are associated with Internet-use disorders, and specific cognitions can mediate this relationship (Brand et al. 2016). Partially parallel to the hypothesis, the neuroticism was indirectly associated with phubbing via problematic Instagram use. Neuroticism was related to higher problematic Instagram use, and in turn, problematic Instagram use led to higher phubbing. This finding contradicts with the result of a recent study (Kircaburun and Griffiths 2018a). However, the aforementioned study included other personality traits in the FoMO, fear of missing out; *p < .05; **p < .01; ***p < .001 Table 3 Standardized estimates of total, direct, and indirect effects on problematic social media use and mediator  (photos, videos, comments, etc.), Instagram is highly appealing for individuals who have higher levels of trait and state-FoMO, and recreational use may easily turn into excessive and compulsive use because-at present-Instagram is a popularly used application for letting others know what is new and what is going on in their lives with live streams and stories (Kircaburun and Griffiths 2018b).
As hypothesized, problematic Instagram use was directly associated with phubbing. This finding is parallel to the previous studies that have found positive relationships between different Internet-use disorders and phubbing (Błachnio and Przepiorka 2018;Karadağ et al. 2015). Even though these results belong to the present sample, it may still be worthwhile to compare different models' prediction proportions in phubbing variance. For example, a recent model explained 54% of it using addictions to the Internet, social media, mobile phones, and gaming as predictors (Karadağ et al. 2015), while the present study explained 73% of phubbing with FoMO and problematic Instagram use. It could be speculated that problematic use of Instagram in particular may be a better predictor of phubbing because every platform has a unique characteristic and popularity. Thus, future studies could focus on the predictor role of different social media applications at the same time. Finally, the present study found that female students had higher levels of phubbing and problematic Instagram use when compared to males. This result is consistent with previous studies (e.g., Błachnio and Przepiorka 2018;Karadağ et al. 2015).
The present study has several limitations. The sample was cross-sectional and nonrepresentative; therefore, the results are unable to demonstrate any causal relationships between the variables examined. Consequently, future studies should use longitudinal designs in order to confirm causal relationships between variables examined in the present study. Data regarding neuroticism, trait Anxiety, FoMO, problematic Instagram use, and phubbing were collected using self-report methods; therefore, several biases may be affecting the results such as social desirability and memory recall. Future studies should use other methodologies (e.g., qualitative or mixed methods) in order to collect data that overcomes some of the problems inherent in using survey methods only.
Despite its limitations, the present study is the first to empirically demonstrate that neuroticism, trait and state fear of missing out, and problematic Instagram use are directly and/or indirectly associated with phubbing. However, future studies are needed to confirm the findings reported here and should also focus on more detailed and complex investigations of the relationships between the constructs here and other personality and psychological domains.
Compliance with Ethical Standards This study complies with all ethical standards.

Conflict of Interest
The authors declare that they have no conflict of interest.
Ethical Approval All procedures performed in this study involving human participants were in accordance with the ethical standards of University's Research Ethics Board and with the 1975 Helsinki Declaration.
Informed Consent Informed consent was obtained from all participants.