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The main purpose of this research paper is to investigate the effect of the injured brain regions of the patients, who suffer from aphasia. This study is from a linguistic perspective. This will be investigated from various perspectives, specifically phonology and syntax. As these study cases face major problems especially in these two linguistic aspects. Some of these language deficits prove that the human brain contains a constrained and well-characterized faculty. The function of this faculty is to represent the sentence structure (Dick et al., 2001, p.759). Moreover, this paper represents the various types of aphasia, by focusing on showing the injured areas in the brain after cerebrovascular stroke. This paper presents three cases who suffer from Anomic Aphasia. The diagnosis of the patients in this research is conducted within the framework of The Western Aphasia Battery Revised (WAB-R), which is a scale of questions that is used to determine the language deficiencies that the patients suffer from (Gom'a et al., forthcoming). After the application of this test, specific regions in the brain, that are responsible for language production and comprehension, are going to be shown. Moreover, it represents the localization theory and how it is related to the human brain. Finally, it investigates the relation between localization theory and Chomsky's distinction between Competence and Performance.