Personality Changes and Early Signs of Dementia

By Katharine Paljug @YourCareE
April 18, 2023
Personality Changes and Early Signs of Dementia

A diagnosis of behavioral impairment could detect early signs of dementia and help identify patients at risk for Alzheimer’s disease and other forms of memory loss.

Alzheimer’s disease, the most common form of severe memory impairment, accounts for between 60 and 80 percent of dementia cases. It is a deadly disease that includes memory loss, anxiety, confusion, depression, and sometimes aggressive behavior. According to the Alzheimer’s Association, about 6.5 million people in the United States are living with Alzheimer’s.

There is no cure. But a diagnosis of mild behavioral impairment, or MBI could help predict whether a person is at risk for severe memory impairment or cognitive decline.


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Dementia and mild behavioral impairment

Mild behavioral impairment is a form of personality change that involves five types of behavior:

  • Apathy, drive, and motivation
  • Impulse control, agitation, and reward
  • Mood, affect, and anxiety
  • Thoughts and perceptions
  • Social appropriateness

The diagnosis is based on the idea that gradual but significant changes in behavior can be one of the early signs a person is at risk for, or is already developing, dementia.

An MBI diagnosis is based on a checklist of 34 points as a tool for detection. The questions on the checklist focus on personality and behavioral changes that have occurred, such as, “Has the person lost the motivation to act on their obligations or interests?” and “Does the person display a new recklessness or lack of judgment when driving?”

Such changes, researchers emphasize, should not be sporadic or temporary. They need to have occurred for a period of six months or longer for a diagnosis of mild behavioral impairment. 

The questions are designed to be used by family members, caregivers, and doctors. They offer a way to track significant personality changes over time to see how a patient or loved one is progressing. 

A way to evaluate dementia

More significantly, the MBI checklist helps doctors evaluate a patient for forms of dementia like Alzheimer’s. Diagnosis typically has focused on memory loss and cognitive impairment. But behavioral changes can be one of the earliest — and often overlooked — signs that the brain is deteriorating, according to Maria C. Carillo, PhD, the chief science officer of the Alzheimer’s Association.

“By looking beyond memory-related issues to closely evaluate the behavioral issues included in the checklist, physicians could reach a more efficient and accurate diagnosis, sooner," said Carrillo. 

Risks and benefits of early detection

Tracking behavioral changes that occur with MBI can help doctors identify patients who are at high risk for developing dementia. It can also provide answers to caregivers and family members who are confused by alterations in a loved one’s personality. 

Often people closest to dementia patients are the first to notice early warning signs, but they aren’t aware of what they signify. Using the checklist can provide answers and allow doctors to suggest medication or lifestyle modifications that could help manage some of the symptoms.

Is the test too broad?

The type of early detection that the MBI checklist provides is not without controversy in the medical community. Some doctors and researchers believe that diagnosing mild behavioral impairment can put patients, caregivers, and insurance companies on high alert for dementia that may never actually develop. 

Kenneth Langa, MD, PhD, a professor of internal medicine at the University of Michigan, is one of the wary ones. “There’s the potential benefit of... identifying people more likely to decline,” Langa told The New York Times. “The flip side is overdiagnosis, labeling someone and getting people in the clinical cascade, where you start doing the test and people start doing more brain imaging and being at the doctor’s more and getting more concerned.”

That could be especially frustrating for some families, as there is no cure for Alzheimer’s and other forms of dementia. 

Zahinoor Ismail, MD, one of the doctors who developed the checklist, believes that identifying instances of mild behavioral impairment can only help. By providing a new way of evaluating neuropsychiatric symptoms, or NPS, the checklist does more than just help doctors diagnose their patients.

"[The checklist] is significant not only clinically, but also in research,” Ismail said. “From a research perspective, the scale may prove to be usable in... observational studies to help assess the impact of NPS in older adults." 

Those studies could help researchers make new advances in not only treating but also curing dementia. 


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April 18, 2023

Reviewed By:  

Janet O’Dell, RN