[leereeves]

You seem to be saying it's a "ridiculous claim" because you're limiting the word "think" to math homework. The article is using "think" in a broader sense that includes decision making, a process that involves the limbic system and other primitive parts of the brain.

It's certainly true that those parts of the brain continue to influence decision making in adults. Nonetheless, research has shown that those parts of the brain are far more influential in teens.