Final answer:
Broca defended functional localization of the brain based on his case study of Louis Victor Leborgne, arguing that different areas of the brain control different motor functions.
Step-by-step explanation:
Pierre Paul Broca defended functional localization of the brain based on his case study of Louis Victor Leborgne. He presented Leborgne's case at the Société d'Anthropologie de Paris meeting in 1861, where he argued that the language function is localized in the frontal lobes. Broca's observations of Leborgne's brain abnormalities led him to conclude that different areas of the brain control different motor functions. This supported his hypothesis that brain function is localized.