The Bystander Effect: A Systematic Review of Multidimensional Determinants

旁观者效应是指在群体情境中，个体因责任扩散而抑制助人行为的社会心理现象。本文系统梳理了旁观者效应的影响因素，包括个体心理特质(如共情能力、自我效能感、社会责任感)、情境因素(如旁观者人数、风险评估、归因模式)以及宏观社会文化背景(如公正世界信念)。研究表明，在网络与校园欺凌中，旁观者角色分化显著，可能成为欺凌的助推者、局外者或保护者，其行为直接影响事件进程。为减少旁观者效应的消极影响，提出多层次策略：社会层面需加强责任感教育，个体层面需提升共情与自我效能感，环境层面应构建尊重包容的校园文化。未来研究可进一步探索技术干预与文化差异的作用，以优化实践指导。The bystander effect refers to a social psychological phenomenon where individuals inhibit helping behaviors in group situations due to diffusion of responsibility. This paper systematically examines the influencing factors of the bystander effect, including individual psychological traits (e.g., empathy, self-efficacy, social responsibility), situational factors (e.g., number of bystanders, risk assessment, attribution patterns), and macro socio-cultural contexts (e.g., belief in a just world). Research indicates that in cyberbullying and school bullying, bystanders play differentiated roles acting as reinforcers, outsiders, or protectors, which directly shape the progression of bullying events. To mitigate the negative impacts of the bystander effect, multi-level strategies are proposed: enhancing social responsibility education at the societal level, improving empathy and self-efficacy at the individual level, and fostering a respectful and inclusive campus culture at the environmental level. Future studies should explore the role of technological interventions and cultural differences to refine practical guidance.