Wallace Jasmina, Boers Elroy, Ouellet Julien, Conrod Patricia
Research Center of Sainte-Justine University Hospital Center in Montreal, Québec, Canada.
University of Montreal, Québec, Canada.
JAACAP Open. 2023 Aug 24;1(4):284-294. doi: 10.1016/j.jaacop.2023.08.002. eCollection 2023 Dec.
The recent widespread diffusion of screen-based devices among adolescents has raised questions about the effects of screen time on adolescent behavior, including aggressive behaviors. However, previous studies have been methodologically limited in their ability to distinguish between common vulnerability, concurrency, and lasting associations between screen time and aggression among adolescents, and findings are still inconsistent. To address this gap in the literature, time-varying direct and indirect associations between screen time and aggression were investigated.
The sample included nearly 4,000 Canadian adolescents who participated in annual surveys for 5 consecutive years. Multilevel statistical models were applied to study between-person effects (common vulnerability), within-person effects (concurrency explaining a priming effect), and lagged-within-person effects (lasting effects explaining a learning process) of screen time (ie, social media use, television viewing, video game playing, computer use) on aggressive behaviors (ie, fighting, conduct problems, hostile thoughts). Screen time effects on aggression through hostility were further studied.
Short-lived concurrent relations between different forms of screen time and aggressive behaviors suggested a priming effect. Social media use was further associated with longer lasting increases in conduct problems, suggesting a social learning process, while television viewing showed significant negative lagged-within-person association with hostility, showing a protective effect. Hostile thoughts mediated screen time and aggression associations mainly at between-person levels.
The results suggest that the nature of the relation between screen time and aggressive behaviors depends on the type of digital platform through which such content is presented and suggest the need for policies focusing on protecting young users of digital media.
Does Delaying Adolescent Substance Use Lead to Improved Cognitive Function and Reduce Risk for Addiction?; https://www.clinicaltrials.gov/: NCT01655615.
近年来，基于屏幕的设备在青少年中广泛普及，这引发了关于屏幕使用时间对青少年行为（包括攻击性行为）影响的问题。然而，以往研究在区分青少年屏幕使用时间与攻击行为之间的共同易感性、并发关系和持久关联方面，方法上存在局限性，研究结果仍不一致。为填补这一文献空白，本研究调查了屏幕使用时间与攻击行为之间随时间变化的直接和间接关联。
样本包括近4000名连续5年参加年度调查的加拿大青少年。应用多水平统计模型研究屏幕使用时间（即社交媒体使用、看电视、玩电子游戏、使用电脑）对攻击行为（即打架、行为问题、敌对思维）的个体间效应（共同易感性）、个体内效应（并发关系解释启动效应）和个体内滞后效应（持久效应解释学习过程）。进一步研究了屏幕使用时间通过敌意对攻击行为的影响。
不同形式的屏幕使用时间与攻击行为之间的短期并发关系表明存在启动效应。社交媒体使用还与行为问题的持续增加有关，表明存在社会学习过程，而看电视与个体内敌意呈显著负向滞后关联，显示出保护作用。敌对思维主要在个体间水平上介导屏幕使用时间与攻击行为的关联。
结果表明，屏幕使用时间与攻击行为之间关系的性质取决于呈现此类内容的数字平台类型，并表明需要制定侧重于保护数字媒体年轻用户的政策。
推迟青少年物质使用是否会改善认知功能并降低成瘾风险？；https://www.clinicaltrials.gov/：NCT01655615 。
