This has a direct effect on the amount of oxygen and nutrients being able to supply the brain, which causes brain cells to die within minutes. "The middle cerebral arteries supply blood to the cortical areas involved in speech, language and swallowing. The left middle cerebral artery provides Brocas area, Wernickes area, Heschls gyrus, and the angular gyrus with blood". Therefore, in patients with Wernickes aphasia, there is typically an occlusion to the left middle cerebral artery.As a result of the occlusion in the left middle cerebral artery, Wernickes aphasia is most commonly caused by a lesion in the posterior superior temporal gyrus (Wernickes area). This area is posterior to the primary auditory cortex (PAC) which is responsible for decoding individual speech sounds. Wernickes primary responsibility is to assign meaning to these speech sounds. The extent of the lesion will determine the severity of the patients deficits related to language. Damage to the surrounding areas (perisylvian region) may also result in Wernickes aphasia symptoms due to variation in individual neuroanatomical structure and any co-occurring damage in adjacent areas of the brain. Diagnosis
Aphasia is usually first recognized by the physician who treats the person for his or her brain injury. Most individuals will undergo a magnetic resonance imaging (MRI) or computed tomography (CT) scan to confirm the presence of a brain injury and to identify its precise location.
Through production of semantically similar features, participants develop more skilled in naming stimuli due to the increase in lexical activation. Restorative therapy approach
Neuroplasticity is a central component to restorative therapy to compensate for brain damage. This approach is especially useful in Wernickes aphasia patients that have had a stroke to the left brain hemisphere.Schuells stimulation approach is a main method in traditional aphasia therapy that follows principles to retrieve function in the auditory modality of language and influence surrounding regions through stimulation. The guidelines to have the most effective stimulation are as follows:
Auditory stimulation of language should be intensive and always present when other language modalities are stimulated. The stimulus should be presented at a difficulty level equal to or just below the patients ability. Sensory stimulation must be present and repeated throughout the treatment. Each stimulus applied should produce a response; if there is no response more stimulation cues should be provided. Response to stimuli should be maximized to create more opportunities for success and feedback for the speech-language pathologist. The feedback of the speech-language pathologist should promote further success and patient and encouragement. Therapy should follow an intensive and systemic method to create success by progressing in difficulty. Therapies should be varied and build off of mastered therapy tasks.Schuells stimulation utilizes stimulation through therapy tasks beginning at a simplified task and progressing to become more difficult including:

Point to tasks. During these tasks the patient is directed to point to an object or multiple objects.