Patients with Wernicke's aphasia - a classical form of posterior language disorder - typically produce a "fluent" output marked by facility in articulations. However, their speech is informationally empty; indefinite noun phrases are often substituted for the appropriate noun and when a noun with specific reference is chosen, it is often the wrong one. Also the Wernicke aphasic's comprehension of language is usually very impaired.
- Goodenough & Zurif & Weintraub (2004), Pag. 254