Which condition is an impairment of language most commonly associated with damage to Broca's or Wernicke's area?

• A. Agnosia
• B. Prosopagnosia
• C. Apraxia
• D. Aphasia

Answer: (D)

Language impairment arises when the language-dominant networks in the left hemisphere, especially Broca's area in the frontal lobe and Wernicke's area in the temporal lobe, are damaged. This disruption leads to aphasia, a disorder of language production and/or comprehension that can manifest in different ways depending on the exact site of injury. Damage to Broca's area often causes nonfluent speech with relatively good comprehension, while damage to Wernicke's area tends to produce fluent but nonsensical speech with poor comprehension. The other options reflect problems in other domains—agnosia is trouble recognizing objects, prosopagnosia is face recognition difficulty, and apraxia is impaired motor planning—not primarily language disturbances tied to those language regions. Thus, the most accurate label for a language impairment linked to damage to Broca's or Wernicke's areas is aphasia.