Dysphasia is a language disorder in which there is an impairment of speech and of comprehension of speech. It is caused by brain damage, usually in the left side of the brain which is responsible for language and communication1.
The term dysphasia has been eclipsed by the modern usage of the term "aphasia" particularly in the field of speech/language pathology so as not to confuse with the swallowing disorder "dysphagia". Aphasia literally means no speech. But the speech impairment in aphasia could range from complete absence of speech to difficulty in naming a few objects. Aphasia is generally tested on the basis of comprehension of speech, fluency of speech, repetition and naming of objects1.
1. http://en.wikipedia.org/wiki/Dysphasia
Transcortical dysphasia is caused by damage to the language-dominant brain that separates all or parts of the central region from the rest of the brain
Dysphasia can be prevented by avoiding the causes of brain injury and stroke, such as high blood pressure
Anomic dysphasia is also referred to as amnesic dysphasia
Broca's dysphasia is the most common type of expressive dysphasia
Expressive dysphasia
Anomic dysphasia
Conduction dysphasia
Associative dysphasia
Receptive dysphasia
Stroke is the most common cause for dysphasia
Damage to the upper temporal lobe, lower parietal, or connection between the Wernicke's and Broca's areas
The term "dysphasia" is a condition (difficulty with language), and does not have a singular or plural.One might refer to various forms or types of dysphasia.