A: Speech is affected in two ways. In some patients, speech is slurred and indistinct or even completely absent, but the patient can read, write and understand perfectly what is said. This condition is called dysarthia, and treatment usually helps with the patient’s recovery.
The other condition is much more complex. It is called dysphasia or aphasia and is due to damage to the part of the brain which controls all language processes. This can affect the patient's ability to speak, understand speech, read and write. Recovery from dysphasia can be rapid and complete, but is, in most cases, slow and incomplete, and patients and their relatives need a great deal of help from speech and language therapists and others.