“Most Alzheimer’s research has been devoted to factors such as education, heart and blood risk factors, head trauma, family history and genetics,” said study author Lena Johannsson, PhD, of the University of Gothenburg in Gothenburg, Sweden. “Personality may influence the individual’s risk for dementia through its effect on behavior, lifestyle or reactions to stress.”
For the study, 800 women with an average age of 46 were followed for 38 years and given personality tests that looked at their level of neuroticism and extraversion or introversion, along with memory tests. Of those, 19 percent developed dementia.
Neuroticism involves being easily distressed and personality traits such as worrying, jealousy or moodiness. People who are neurotic are more likely to express anger, guilt, envy, anxiety or depression. Introversion is described as shyness and reserve and extraversion is associated with being outgoing.