The implementation of warning labels has been shown to slow the spread of harmful content on social media, but the mechanisms by which these interventions affect individuals' sharing decisions are not yet known. This study sought to establish the efficacy of these interventions and to explore the mechanisms of their influence using two parallel studies conducted within the United States: an online experiment that tested the effects of cannabis warning labels on sharing intentions (N = 1,776), and a neuroimaging study (N = 40) to examine how warning labels influenced activity in brain regions implicated in sharing decisions. Results demonstrated that warning labels paired with cannabis posts reduced intentions to share and were associated with decreased activation of brain regions associated with self-processing compared to cannabis posts alone. These results suggest that warning labels may discourage sharing by negatively influencing perceptions of self-relevance.

中文翻译：

---

图片警告标签减少了分享意图，钝化了社交媒体宣传大麻食品的帖子所引发的自我相关性过程

警告标签的实施已被证明可以减缓有害内容在社交媒体上的传播，但这些干预措施影响个人分享决定的机制尚不清楚。本研究试图确定这些干预措施的有效性，并使用在美国进行的两项平行研究来探索其影响机制：一项在线实验，测试大麻警告标签对分享意图的影响 （N = 1,776），以及一项神经影像学研究 （N = 40），以检查警告标签如何影响与分享决定有关的大脑区域的活动。结果表明，与单独的大麻帖子相比，与大麻帖子配对的警告标签降低了分享的意图，并且与与自我处理相关的大脑区域的激活减少有关。这些结果表明，警告标签可能会通过对自我相关性的看法产生负面影响来阻止分享。