A researcher scans the brains of gum-chewing volunteers, finds out which part of their brains is most active, and concludes that he or she has discovered the brain's "gum-chewing center." What's wrong with this conclusion?

What will be an ideal response?

Many actions and sensations are involved in chewing gum, such as the chewing motion, enjoyment of the flavors, and salivation. A brain scan may tell us where things are happening, but not why or how they are happening. The same areas might also become active when you chew a piece of asparagus. Finally, even if there were a gum-chewing center (there isn't!), yours might not be in the same place as someone else's. Brains vary a lot, a fact that may be lost when a researcher averages the results of all the brain scans in his or her study.