人間の脳内におけるコーヒーの作用は？

下記の記事が出ている。

　How coffee REWIRES your brain: Researcher gives himself an MRI scan two days a week for 18 months - and it shows the incredible effect of caffeine
　Daily Mail: December 12, 2015
　http://www.dailymail.co.uk/sciencetech/article-3356785/How-coffee-REWIRES-brain-Researcher-gives-MRI-scan-two-days-week-18-months-shows-incredible-effect-caffeine.html