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Lost Brain Connections May Be Behind Aging's Memory Loss

Lost Brain Connections May Be Behind Aging’s Memory Loss

Researchers believe a lack of cohesion among brain regions is a key reason for age-related memory decline.

During youth, the brain is characterized by brain regions consisting of large synchronous groups that link nearly the entire brain in coordinated activity.

In a new study, investigators discovered these groups of brain regions that synchronize their activity during memory tasks, become smaller and more numerous as people age. Interestingly, the number of connections is different for each individual although the reduction in synchronized activity is consistent.

The study has been published in PLOS Computational Biology.

Typically, research on brain activity relies on average brain measurements across entire groups of people. In the new study, Dr. Elizabeth Davison of Princeton University, New Jersey, and colleagues describe a novel method to characterize and compare the brain dynamics of individual people.

The researchers used functional magnetic resonance imaging (fMRI) to record healthy people’s brain activity during memory tasks, attention tasks, and at rest.

For each person, fMRI data was recast as a network composed of brain regions and the connections between them. The scientists then use this network to measure how closely different groups of connections changed together over time.

They found that, regardless of whether a person is using memory, directing attention, or resting, the number of synchronous groups of connections within one brain is consistent for that person. However, between people, these numbers vary dramatically.

During memory specifically, variations between people are closely linked to age. Younger participants have only a few large synchronous groups that link nearly the entire brain in coordinated activity, while older participants show progressively more and smaller groups of connections.

Researchers believe this indicates a loss of cohesive brain activity, even in the absence of memory impairment.

“This method elegantly captures important differences between individual brains, which are often complex and difficult to describe,” Davison said.

“The resulting tools show promise for understanding how different brain characteristics are related to behavior, health, and disease.”

Future work will investigate how to use individual brain signatures to differentiate between healthily aging brains and brains with age-related impairments.

Source: PLOS/EurekAlert

Lost Brain Connections May Be Behind Aging’s Memory Loss

Rick Nauert PhD

Rick Nauert, PhDDr. Rick Nauert has over 25 years experience in clinical, administrative and academic healthcare. He is currently an associate professor for Rocky Mountain University of Health Professionals doctoral program in health promotion and wellness. Dr. Nauert began his career as a clinical physical therapist and served as a regional manager for a publicly traded multidisciplinary rehabilitation agency for 12 years. He has masters degrees in health-fitness management and healthcare administration and a doctoral degree from The University of Texas at Austin focused on health care informatics, health administration, health education and health policy. His research efforts included the area of telehealth with a specialty in disease management.

APA Reference
Nauert PhD, R. (2016). Lost Brain Connections May Be Behind Aging’s Memory Loss. Psych Central. Retrieved on October 17, 2018, from https://psychcentral.com/news/2016/11/28/memory-declines-during-aging-linked-to-lost-brain-connections/113133.html

 

Scientifically Reviewed
Last updated: 28 Nov 2016
Last reviewed: By John M. Grohol, Psy.D. on 28 Nov 2016
Published on PsychCentral.com. All rights reserved.