Disgust, as a part of the behavioral immune system, leads people to avoid behaviors of pathogens so as to reduce the probability of infection. Disgust also shows the source effects based on familiarity. However, these source effects have not been tested on the older population. Thus, we tested the source effects of emotional and behavioral reactions from the disgust toward older adults and the possible moderating effects of filial piety on disgust. In the first study, we employed the self-report method to test the source effects of emotional feelings of disgust amongst undergraduates. In the second study, we measured whether filial piety among community adults produced moderating effects of the disgust toward older adults. In the third study, we employed the shape discrimination task to test the source effects of behavioral avoidance to older adults among undergraduates. The first and third studies show stronger negative emotional/avoidance reactions towards unfamiliar older adults than familiar older adults, affirming the source effects of disgust towards older adults that we expected. However, we did not find moderating effects of filial piety associated with disgust. These findings can help us understand the evolutionary origin of disgust toward older adults, which is likely activated more intensely and quickly in response to unfamiliar individuals as compared with familiar individuals.

厌恶作为行为免疫系统的一部分，会导致人们避免病原体的行为，从而降低感染的可能性。厌恶也显示了基于熟悉的源效应。然而，这些源效应尚未在老年人群中进行测试。因此，我们测试了对老年人厌恶的情绪和行为反应的来源效应以及孝道对厌恶的可能调节作用。在第一项研究中，我们采用自我报告法来检验大学生厌恶情绪的来源效应。在第二项研究中，我们测量了社区成年人的孝道是否对老年人的厌恶产生了调节作用。在第三项研究中，我们采用形状辨别任务来测试行为回避对大学生中老年人的源效应。第一项和第三项研究表明，对不熟悉的老年人的负面情绪/回避反应比对熟悉的老年人更强，这证实了我们预期的对老年人的厌恶的来源效应。然而，我们没有发现与厌恶相关的孝道的调节作用。这些发现可以帮助我们了解对老年人的厌恶的进化起源，与熟悉的人相比，对不熟悉的人的反应可能会更强烈、更迅速地激活。肯定了我们预期的对老年人的厌恶的根源效应。然而，我们没有发现与厌恶相关的孝道的调节作用。这些发现可以帮助我们了解对老年人的厌恶的进化起源，与熟悉的人相比，对不熟悉的人的反应可能会更强烈、更迅速地激活。肯定了我们预期的对老年人的厌恶的根源效应。然而，我们没有发现与厌恶相关的孝道的调节作用。这些发现可以帮助我们了解对老年人的厌恶的进化起源，与熟悉的人相比，对不熟悉的人的反应可能会更强烈、更迅速地激活。