How can doctors learn more about stroke patients by studying these impairments?

Question by BarefootGirl: How can doctors learn more about stroke patients by studying these impairments?
A stroke is caused by a blockage of blood circulation to the brain. As a result, a part of the brain is not getting the needed oxygen. If a person who has a stroke lives, often there are impairments in their motor or sensory neurons. Why does a stroke on the left side of the brain cause impairments to the right side of the body? Doctors often use the patients as models for brain mapping. How can doctors learn more about the brain by studying the impairments shown by these patients?

Best answer:

Answer by eigenfunxion
In a miracle of development, the right side of your brain actually does control the left side of your body… most fibers cross over.

By studying what gets knocked out ability-wise (like sensation in the back of your hand or the inability to hold back insults) and correlating it with the location of the blockage, you can see which parts of the brain control those functions. This doesn’t work for muscles of facial expression around your eyes b/c they are controlled by both hemispheres.

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