Background and aims The multifaceted nature of problematic online behaviors (POBs) among adolescents presents a significant clinical challenge, yet their underlying constructs and developmental pathways remain unclear. This study proposes the Conditioned Hierarchical Transition Model (CHTM) and provides an initial longitudinal test of one core directional premise: whether baseline content-specific POB symptoms prospectively predict later generalized, medium-based POBs (e.g., problematic smartphone use, PSU). Methods A two-wave, one-year longitudinal study was conducted with 2,188 Chinese adolescents ( M age = 16.46, SD = 0.88; 57.3% female) who completed measures of PSU, POGU and PSNU. We employed cross-lagged panel network analysis to estimate the directed temporal network of symptoms and used network comparison tests to examine sex differences. Results Results revealed a clear directional pathway from content-specific POBs to generalized PSU. Tolerance and withdrawal from POGU and loss of control over PSNU emerged as key driving symptoms. Conversely, PSU's own tolerance and withdrawal symptoms were the primary vulnerable symptoms. While initiating pathways were sex-specific—driven by externalizing factors (e.g., concealment) in males and internalizing factors (e.g., mood regulation) in females—both converged on generalized PSU. Conclusions Our findings provide preliminary longitudinal and symptom-level support for a core premise of the Conditioned Hierarchical Transition Model, wherein specific content dependencies evolve into a generalized dependency on the smartphone. This model empirically reconciles the long-standing "content vs. medium" debate in behavioral addiction. Identifying the driving symptoms and sex-specific pathways can inform precise, mechanism-based interventions to support adolescent digital well-being.
Kang et al. (Mon,) studied this question.