Washington: Mice can recover from physically debilitating strokes that damage the primary motor cortex - the region of the brain that controls most movement in the body - if the rodents are quickly subjected to physical conditioning that rapidly "rewires" a different part of the brain to take over lost function.This is what Johns Hopkins researchers have found in a new study."Despite all of our approved therapies, stroke patients still have a high likelihood of ending up with deficits. This research allows us the opportunity to test meaningful training and pharmacological ways to encourage recovery of function, and should impact the care of patients," said study leader Steven R. Zeiler, MD, PhD, an assistant professor of neurology at the Johns Hopkins University School of Medicine.For their study, the researchers first trained normal but hungry mice to reach for and grab pellets of food in a precise way that avoided spilling the pellets and gave them the pellets as a reward. The task was difficult to master, the researchers noted, but the mice reached maximum accuracy after seven to nine training days.Then the researchers created experimental small strokes that left the mice with damage to the primary motor cortex. Predictably, the reaching and grasping precision disappeared, but a week of retraining, begun just 48 hours after the stroke, led the mice to again successfully perform the task with a degree of precision comparable to before the stroke.Subsequent brain studies showed that although many nerve cells in the primary motor cortex were permanently damaged by the stroke, a different part of the brain called the medial premotor cortex adapted to control reaching and grasping.Zeiler said that the function of the medial premotor cortex is not well-understood, but in this case it seemed to take over the functions associated with the reach-and-grab task in his experimental mice.
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