Abstract: This paper discussed speech behavior in four aspects through three casesof patients having brain damage in different(?)locations——listening,speaking,reading and writing,which were compared and analyzed so as to interpretthe relations among them,while the so-called"supporting effect of spokenlanguage to the written language"was particularly presented and discussed.This may be helpful to the diagnosis,rehabilitation of the speech disordercaused by brain damage,and also may be helpful to the practice oflanguage education.

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