|Which Greeble is different? Credit: Michael J. Tarr, |
Center for the Neural Basis of Cognition and Department
of Psychology, Carnegie Mellon University
Alzheimer's disease (AD) is a progressive, irreversible neurodegenerative disease characterized by declining memory, cognition and behavior. AD is the most prevalent form of dementia, affecting over 40 million worldwide, accounting for 60 to 80 percent of dementia cases.
The disease is characterized by the presence of beta amyloid plaques and tau neurofibrillary tangles in the brain. Tau tangles predictably develop first in the perirhinal and entorhinal cortices of the brain, areas that play a role in visual recognition and memory. Now, researchers have developed cognitive tests, using unique graphic characters called Greebles, designed to detect subtle deficiencies in these cognitive functions. The research, published in the Journal of Alzheimer's Disease, could potentially detect signs of AD decades before symptoms become apparent.
"Right now, by the time we can detect the disease, it would be very difficult to restore function because so much damage has been done to the brain," said Emily Mason from the University of Louisville. "We want to be able to look at really early, really subtle changes that are going on in the brain. One way we can do that is with cognitive testing that is directed at a very specific area of the brain."
Mason identified test subjects age 40-60 who were considered at-risk for AD due to having at least one biological parent diagnosed with the disease. She also tested a control group of individuals in the same age range whose immediate family history did not include AD.
The subjects completed a series of "odd-man-out" tasks in which they were shown sets of four images depicting real-world objects, human faces, scenes and Greebles in which one image was slightly different than the other three. The subjects were asked to identify the image that was different.
The at-risk and control groups performed at similar levels for the objects, faces and scenes. For the Greebles, however, the at-risk group scored lower in their ability to identify differences in the images. Individuals in the at-risk group correctly identified the distinct Greeble 78 percent of the time, whereas the control group correctly identified the odd Greeble 87 percent of the time.
"Most people have never seen a Greeble and Greebles are highly similar, so they are by far the toughest objects to differentiate," Mason said. "What we found is that using this task, we were able to find a significant difference between the at-risk group and the control group. Both groups did get better with practice, but the at-risk group lagged behind the control group throughout the process." Mason would like to see further research to determine whether the individuals who performed poorly on the test actually developed AD in the future.
Brandon Ally, assistant professor of neurological surgery at UofL and senior author of the publication, said the tests with Greebles can provide a cost-effective way to identify individuals who may be in the early stages of AD, as well as a tool for following those individuals over time.
"We are not proposing that the identification of novel objects such as Greebles is a definitive marker of the disease, but when paired with some of the novel biomarkers and a solid clinical history, it may improve our diagnostic acumen in early high-risk individuals," Ally said. "As prevention methods, vaccines or disease modifying drugs become available, markers like novel object detection may help to identify the high priority candidates."