One might have thought that the same brain areas are involved in both writing and speaking, since writing developed from our ability to speak. That is not the case.
A person with a brain damage might have problems with gramatical correctness while writing, but might not have the same problem while speaking the same sentence. Others might have a speech problem, while writing is unaffected.
Simon Fischer-Baum of Rice University and Michele Miozzo of Columbia University, both cognitive scientists, conducted a study on five stroke victims.
Their results, that the brain differentiates between writing and speech, might be able to help educators.
Johns Hopkins University. "Say what? How the brain separates our ability to talk and write." ScienceDaily. ScienceDaily, 5 May 2015.
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