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I wrote my paper on aphasia, a language disorder caused by the brain.  Individuals with aphasia have trouble with verbal and written language sometimes being unable to understand other or make understandable sentences and statements themselves.  One type of aphasia occurs in the Wernicke's area in the temporal lobe.  In Wernicke's aphasia individuals can form fluent sentences however they do not make sense and they sometimes use neologisms, or made up words.  Because these individuals cannot understand what other people are saying to them they do not understand that they are talking in gibberish and making up sentences that are unclear.  I think that this may be similar to the afferent loop.  These individuals create an output but because there is no input (they do not understand verb language) they never realize what they are saying.