Rewarding Behavior

Having a purpose in life may improve health of aging brain




Having a strong sense that your life has meaning and direction may make you less likely to develop areas of brain damage caused by blockages in blood flow as you age. This research was reported in the American Heart Association’s journal Stroke.

"Mental health, in particular positive psychological factors such as having a purpose in life, are emerging as very potent determinants of health outcomes," said Patricia Boyle, Ph.D., study co-author and associate professor of behavioral sciences at the Rush Alzheimer’s Disease Center of Rush University Medical Center in Chicago. "Clinicians need to be aware of patients’ mental state and encourage behaviors that will increase purpose and other positive emotional states."

Researchers analyzed autopsy results on 453 people, average age 84, who volunteered for the Rush Memory and Aging Project and underwent annual physical and psychological evaluations until they died, at an average age of 90. None of the participants had known dementia when they started the study, and all participants had agreed to organ donation at death.

When a blockage interrupts blood flow in a vessel within the brain, the damaged tissue, called infarcts, may contribute to dementia, movement problems, disability and death as people age.

Among the 453 participants, 114 had clinically diagnosed stroke. At autopsy, researchers found:

  • Nearly twice that many had macroscopic infarcts (visible to the naked eye) or microinfarcts (visible with microscope).
  • Participants who had reported a stronger purpose in life were 44 percent less likely to have macroscopic infarcts. The study did not find a significant relationship between purpose in life and microinfarcts.
  • Adjusting for vascular disease risk factors, including blood pressure, physical activity, depression and diabetes did not change the relationship between purpose in life and infarcts.
  • The relationship between purpose in life and infarcts was not influenced by Alzheimer’s disease or clinically diagnosed stroke.

Although people’s scores on measures of purpose in life changed little during the course of the study, researchers believe that it can be improved.

"Purpose in life differs for everyone and it is important to be thoughtful about what motivates you, (such as volunteering, learning new things, or being part of the community) so you can engage in rewarding behaviors," said Lei Yu, Ph.D., study lead author and assistant professor of neurological sciences at the Rush Alzheimer’s Disease Center.

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