KMAN Publication Inc. (KMANPUB) Journal of Adolescent and Youth Psychological Studies (JAYPS) 2981-2526 In Press 2027 03 01 Structural Modeling of Nomophobia Based on Brain–Behavioral Systems and Intolerance of Uncertainty: The Mediating Role of Emotional Self-Efficacy among University Students Structural Modeling of Nomophobia Based on Brain–Behavioral Systems and Intolerance of Uncertainty: The Mediating Role of Emotional Self-Efficacy among University Students 1 15 EN Journal Article 2026 05 21 <table> <tbody> <tr> <td> <p><strong>Objective:</strong>  This study examined a structural model of nomophobia based on brain–behavioral systems and intolerance of uncertainty, with emotional self-efficacy as a mediator.</p> <p><strong>Methods and Materials:</strong> A cross-sectional correlational study was conducted among 186 university students. Participants completed measures of the Behavioral Activation System (BAS), Behavioral Inhibition System (BIS), Fight–Flight–Freeze System (FFS), intolerance of uncertainty, emotional self-efficacy, and nomophobia. Data were analyzed using Pearson correlations, multiple regression, and structural equation modeling in SPSS 26 and AMOS 26. Indirect effects were tested using 2,000 bootstrap resamples.</p> <p><strong>Findings:</strong> BAS, BIS, FFS, and intolerance of uncertainty were positively associated with nomophobia, whereas emotional self-efficacy was negatively associated with nomophobia. The predictors collectively explained 52% of the variance in nomophobia. Intolerance of uncertainty was the strongest positive predictor (β = .33 in regression; β = .31 in the structural model), while emotional self-efficacy showed a significant negative effect (β = −.26). The structural model demonstrated acceptable fit (χ²/df = 1.92, GFI = .91, CFI = .92, IFI = .92, RMSEA = .07). Emotional self-efficacy partially mediated the effects of BAS, BIS, FFS, and intolerance of uncertainty on nomophobia; all indirect effects were significant.</p> <p><strong>Conclusion:</strong> Nomophobia appears to reflect the combined influence of neurobehavioral sensitivity, intolerance of uncertainty, and emotional regulatory beliefs. Strengthening emotional self-efficacy and reducing intolerance of uncertainty may represent targets for university-based prevention and counseling programs.</p> </td> </tr> </tbody> </table> <p> </p> https://journals.kmanpub.com/index.php/jayps/article/download/5957/11413