Apraxia, Dysarthria, Aphasia

Apraxia occurs when there is a breakdown in motor planning from the brain to the nerves that control coordination of muscles necessary to make speech sounds.  

Dysarthria is often described as"slurred" speech caused by muscle weakness often due to brain damage. 

Aphasia presents as difficulty understanding language, reading, writing, prolonged searching for words, "broken" or "nonsense speech" often following damage to the left side of the brain.