anosognosia A lack of awareness and recognition of a condition or disease.

apraxia of speech An articulatory deficit characterized by awkward and labored articulation, sound distortions, and substitutions in the absence of impaired strength or coordination of the speech organs.

dysarthria A speech impairment resulting from pathology of the motor speech system in which the articulation, rate, resonance, loudness, voice quality, or other acoustic aspect of speech are affected.

neologism A meaningless word.

phonology The system of speech sounds.

prosody The melody, stress, and intonation of speech.

Aphasia is an acquired communication disorder caused by damage to the brain that is manifest in an impairment of the ability to transmit or exchange information and feelings, especially in speaking, and it may also affect writing, comprehension of spoken language, and reading. There are more than 1 million individuals in the United States with aphasia and approximately 84,000 new cases each year. The aphasia population comprises approximately 15% of the adult speech-language impaired population. Aphasia is most prevalent among individuals older than the age of 65 who have suffered a stroke, and in a smaller number it may be the result of head trauma or tumors. Aphasia is also sometimes present in the early stages of Alzheimer's disease.

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