Neurocognitive Linguistics is an attempt to understand the linguistic system of the human brain. The object of investigation is the mental system that supports our language processing __________. That is the basic challenge facing neurocognitive linguistics. But since our linguistic systems are housed in our brains, we have no choice but to treat language as a mental phenomenon

• A. Man has always been fascinated by amazing facts about his own brain
• B. Of course, this mental system is not directly observable
• C. There have been numerous kinds of research done on the brain structure
• D. There was one single professor famous for his ideas about the function of the brain