Speech problems Dysphasia Overview: • A deficit in the higher language functions i.e. comprehension and generation. • Aphasia is a total absence. • Most commonly due to a left anterior circulation stroke. • If speech is internally consistent but nonsense, it is confusion not dysphasia. Receptive (Wernicke's) dysphasia • Temporal lobe lesion. • Patient can't follow a command e.g. lift a hand. If the problem is only with a series of commands, the more they can manage then the better the prognosis.