A change in a person’s sense of humor could be an early indicator of dementia, according to a 2015 article by Jason Warren and colleagues in the Journal of Alzheimer’s Disease. The changes can appear as early as 10 years before a diagnosis of dementia. Almost all participants who would go on to be diagnosed with frontotemporal dementia showed an increased preference for slapstick humor over satirical or absurdist compared with those who would not. In contrast, changes in sense of humor appeared in less than half of those who would go on to be diagnosed with Alzheimer’s disease, indicating that changes in sense of humor may allow doctors to distinguish between different types of dementia.
The study has some limitations. It was small (48 patients) and relied on patients’ memory of what kind of humor they enjoyed 15 years earlier. More research is needed to clarify the link between changes in humor preferences and dementia.
Warren suggests that changes in humor appear before other warning signs of dementia, such as memory loss. He called humor a type of “stress test” for the brain, since getting a joke can require a quick shift in perspective.