风险倾向指的是个体选择寻求或规避风险的意愿。高风险行为给个人、家庭和社会带来的健康后果和经济代价是巨大的。为了能更好地解释和干预人们的高风险行为，研究者首先须了解的问题是：遗传和环境因素如何影响人们的风险寻求行为？鉴于社交媒体文本分析能够实时动态监测人们的风险倾向，而双生子研究能探索风险倾向的遗传度及其神经机制，本项目拟借助社交媒体文本分析技术，采用心理学、遗传学和认知神经科学的研究手段，从特质和状态两个角度来探索遗传与环境因素对人们风险倾向的行为及脑活动的影响，揭示人们风险倾向的节律变化（即，随昼夜和季节变化的规律），寻找风险倾向相关的内表型，为进一步对高风险行为的干预提供理论和实证基础。

Risk propensity is defined as an individual's tendency to take or avoid risk. The health consequences and monetary costs of high-risk behaviors to individuals, their families, and society as a whole are staggering and justify public interventions. To reduce high-risk behavior, researchers should initially concentrate on the question of how genetic and environmental factors influence individual risk propensity. Considering that social media text is useful for real-time monitoring people’s risk propensity, and that twin study can be used to explore the heritability of risk propensity, the current project aims to explore the genetic and environmental influence on individual risk propensity and the risk-related brain activity from the state and trait perspectives by using the methodologies of social media text, psychology, genetics and neuroscience. The findings of this project are expected to provide psychology and neuroscience-based theoretical foundations for preventing high-risk behavior.