The spread of misinformation is a growing problem, particularly in light of the COVID-19 pandemic. Implementing multiple psychological interventions simultaneously is a potential approach to countering misinformation, but little is known about the effectiveness of combined interventions. Based on accuracy nudge theory, which posits that inattention to accuracy is the primary driver of misinformation sharing, we hypothesized that accuracy nudges and warning labels would complement each other to enhance their effectiveness in reducing the intention to share misinformation. To investigate, we conducted an online survey with a sample of 1,399 U.S. adults. The results showed that the effect of the accuracy nudge alone was significantly enhanced when combined with the warning label; however, the effect of the warning label alone was not significantly enhanced when combined with the accuracy nudge, suggesting that they do not share a mutually complementary relationship. These findings remained consistent regardless of whether the intervention effects were assessed using sharing intentions for fake headlines or the difference in sharing intentions between fake and real headlines. We discuss potential explanations for and practical implications of these findings.

错误信息的传播是一个日益严重的问题，特别是在新冠肺炎疫情的背景下。同时实施多种心理干预措施可能是应对错误信息的一种潜在方法，但关于联合干预效果的知识却很少。基于准确性提示理论，该理论认为对准确性的忽视是导致分享错误信息的主要因素，我们假设准确性提示和警告标签可以相互补充，从而增强其减少分享错误信息意图的效果。为了调查这一问题，我们进行了一项在线调查，样本包括1,399名美国成年人。结果显示，单独使用准确性提示的效果在与警告标签结合时显著提高；然而，单独使用警告标签的效果在与准确性提示结合后并没有显著提高，这表明它们之间不存在相互补充的关系。无论是在评估分享虚假标题的意图还是在评估虚假和真实标题之间的分享意图差异时，这些发现都是一致的。我们讨论了这些发现的潜在解释及其实际意义。