Rehabilitation can help retrain the brain following stroke, but the length of time and the ability of the body to recover is different from person to person. This largely depends on the type of stroke, the part of the brain that's affected and how many brain cells die (also known as the "infarction"). Whether the infarction is large or small does not matter as much as what part of the brain is affected. For example, if the brain tissue dies in the interior of the brain, it can cause paralysis on one side of the body. If it is in the occipital lobe area, it can affect vision.