"Wernicke's aphasia" is defined by fluent but semantically empty speech, with superficially normal melodic line, in patients who neverthless demonstrate moderate to severe problems in the comprehension of everyday language. These patients also demonstrate problems in word-finding, accompained by frequent or occasional paraphasias.
- Bates & Friederici & Wulfeck (2004), a pag.269

Although paragrammatisms are occasionally reported for patients from a variety of diagnostic categories, in English these symptoms are most often associated with posterior lesions. They are particularly likely to occur in Wernicke's aphasia, though paragrammatism is not a criterial symptom for this syndrome (which is usually defined primarily by the presence of moderate to severe comprehension deficits, with fluent but semantically empty speech).
- Bates & Friederici & Wulfeck (2004), a pag.264