u. refers to loss or impairment in the ability to understand or comprehend language - or to express oneself through language. This arises due to brain injury or disease. The receptive designation refers to an impaired ability to understand words, signs, or gestures, whereas the expressive designation refers to an impaired ability to speak, write, or make meaningful gestures. Major causes of this type of disorder are stroke, brain tumor, encephalitis, and head injury/trauma. Some of the most important or common forms of this are alexia, amnesic aphasia, auditory aphasia, broca
APHASIA: "A person with aphasia likely has an impaired ability to express or comprehend language - possibly arising from brain disease or injury."