Navigation Links
Brain connections break down as we age
Date:8/18/2010

ANN ARBOR, Mich.---It's unavoidable: breakdowns in brain connections slow down our physical response times as we age, a new study suggests.

This slower reactivity is associated with an age-related breakdown in the corpus callosum, a part of the brain that acts as a dam during one-sided motor activities to prevent unwanted connectivity, or cross-talk, between the two halves of the brain, said Rachael Seidler, associate professor in the University of Michigan School of Kinesiology and Department of Psychology, and lead study author.

At other times the corpus callosum acts at a bridge and cross-talk is helpful, such as in certain cognitive functions or two-sided motor skills.

The U-M study is the first known to show that this cross-talk happens even while older adults are at rest, said Seidler, who also has appointments in the Institute of Gerontology and the Neuroscience Graduate Program. This resting cross-talk suggests that it is not helpful or compensatory for the two halves of the brain to communicate during one-sided motor movements because the opposite side of the brain controls the part of the body that is moving. So, when both sides of the brain talk simultaneously while one side of the body tries to move, confusion and slower responses result, Seidler said.

Previous studies have shown that cross-talk in the brain during certain motor tasks increases with age but it wasn't clear if that cross-talk helped or hindered brain function, said Seidler.

"Cross-talk is not a function of task difficulty, because we see these changes in the brain when people are not moving," Seidler said.

In some diseases where the corpus callosum is very deteriorated, such as in people with multiple sclerosis, you can see "mirror movements" during one sided-motor tasks, where both sides move in concert because there is so much communication between the two hemispheres of the brain, Seidler said. These mirror movements also happen normally in very young children before the corpus callosum is fully developed.

In the study, researchers gave joysticks to adults between the ages of 65 and 75 and measured and compared their response times against a group approximately 20-25 years old.

Researchers then used a functional MRI to image the blood-oxygen levels in different parts of the brain, a measurement of brain activity.

"The more they recruited the other side of the brain, the slower they responded," Seidler said.

However there is hope, and just because we inevitably age doesn't mean it's our fate to react more slowly. Seidler's group is working on developing and piloting motor training studies that might rebuild or maintain the corpus callosum to limit overflow between hemispheres, she said.

A previous study done by another group showed that doing aerobic training for three months helped to rebuild the corpus callosum, she said, which suggests that physical activity can help to counteract the effects of the age-related degeneration.

Seidler's group also has a study in review that uses the same brain imaging techniques to examine disease related brain changes in Parkinson's patients.


'/>"/>

Contact: Laura Bailey
baileylm@umich.edu
734-647-1848
University of Michigan
Source:Eurekalert  

Related biology news :

1. Brain gene expression changes when honey bees go the distance
2. Boston Univ., Veterans Affairs find sports brain trauma may cause disease mimicking ALS
3. Saving the brains white matter with mutated mice
4. Deathstalker scorpion venom could improve gene therapy for brain cancer
5. Newly discovered mechanism controls levels and efficacy of a marijuana-like substance in the brain
6. Caltech: Gain and loss in optimistic versus pessimistic brains
7. Brain size determines whether fish hunters or slackers
8. Scripps research study shows infectious prions can arise spontaneously in normal brain tissue
9. Children with brain injuries have problems with story-telling
10. Irradiating stem cell niche doubles survival in brain cancer patients
11. Does the existing standard of care supply energy sources to brain tumor cells?
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Brain connections break down as we age
(Date:6/22/2016)... 2016  The American College of Medical Genetics and Genomics ... as one of the fastest-growing trade shows during the ... Bellagio in Las Vegas . ... growth in each of the following categories: net square feet ... of attendees. The 2015 ACMG Annual Meeting was ranked 23 ...
(Date:6/16/2016)... June 16, 2016 The ... expected to reach USD 1.83 billion by 2024, ... Research, Inc. Technological proliferation and increasing demand in ... expected to drive the market growth. ... The development of advanced multimodal techniques for ...
(Date:6/3/2016)... 2016 Das DOTM ... Nepal hat ein 44 Millionen ... Kennzeichen, einschließlich Personalisierung, Registrierung und IT-Infrastruktur, an ... und Implementierung von Identitätsmanagementlösungen. Zahlreiche renommierte internationale ... teilgenommen, aber Decatur wurde als konformste und ...
Breaking Biology News(10 mins):
(Date:6/23/2016)... June 23, 2016 Houston Methodist Willowbrook ... Cy-Fair Sports Association to serve as their official ... Houston Methodist Willowbrook will provide sponsorship support, athletic ... with association coaches, volunteers, athletes and families. ... Cy-Fair Sports Association and to bring Houston Methodist ...
(Date:6/23/2016)... , June 23, 2016  The Prostate Cancer Foundation (PCF) is ... treatments and faster cures for prostate cancer. Members of the Class of 2016 ... countries. Read More About the Class of 2016 PCF ... ... ...
(Date:6/23/2016)... 2016   EpiBiome , a precision microbiome engineering ... debt financing from Silicon Valley Bank (SVB). The financing ... advance its drug development efforts, as well as purchase ... "SVB has been an incredible strategic partner to us ... bank would provide," said Dr. Aeron Tynes Hammack ...
(Date:6/23/2016)... OTTAWA, ON (PRWEB) , ... June 23, 2016 , ... ... former DNA Technical Leader at the Arkansas State Crime Laboratory, has joined STACS DNA ... joining the STACS DNA team,” said Jocelyn Tremblay, President and COO of STACS DNA. ...
Breaking Biology Technology: