Damage to which left hemisphere region typically produces Broca's aphasia, characterized by nonfluent speech with relatively preserved comprehension?

• A. Right inferior frontal gyrus
• B. Left inferior frontal gyrus (Broca's area) in the dominant hemisphere
• C. Left superior temporal gyrus
• D. Angular gyrus

Answer: (B)

Damage to the left inferior frontal gyrus in the dominant hemisphere, the region known as Broca's area, disrupts the motor programming for speech. When this area is damaged, speech becomes nonfluent, effortful, and telegraphic, often with agrammatism, yet comprehension remains relatively intact because the posterior language areas responsible for understanding are spared. Repetition is also impaired due to the disrupted ability to plan and execute spoken words. Other regions mentioned have different language roles: damage to Wernicke's area in the left superior temporal gyrus leads to fluent but poorly understood speech with impaired comprehension; the angular gyrus supports reading and higher-level language and semantic processing; and the right inferior frontal gyrus is not typically associated with the classic Broca's aphasia pattern.