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.
between the two hemispheres that is not apparent in the younger brain on the right. Image credit: Rachael 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.
“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.
The study appeared in the journal Frontiers in Systems Neuroscience.
*Source: University of Michigan