ABSTRACT
The brain is the organ of the mind. It is also an organ of the body and, as such, is susceptible to injury and illness. The most common cause of injury to the brain is a stroke. That is, a disruption of the blood supply to a part of the brain which may be caused by the bursting of an artery or the blockage of an artery by a blood clot. Disorders affecting the comprehension or production of spoken language which occur as a consequence of brain injury are known as aphasias. There are many different types of aphasia, depending upon just what aspects of speech processing have been impaired. Cognitive neuropsychologists want to be able to use data from patients to test and develop theories of normal skilled reading. The sublexical procedure that mediates much of the reading performance of a surface dyslexic is precisely the procedure that is impaired in phonological dyslexia.
