A deficit in language in which comprehension of language is preserved, but the individual's speech is defective in ways resembling Wernicke's aphasia: fluent, properly articulated, but largely nonsensical. Unlike Wernicke's aphasia, the patient with conduction apahsia is aware of the problem, but is unable to correct his or her own erroneous speech. This syndrome occurs when the anterior and posterior speech areas are both intact but are disconnected from each other because of a lesion in the arcuate fasciculus  or parietal cortex on the left side.