Helen Fisher 2: The brain in love

TED 2008
Helen Fisher 2: The brain in love (script)
Summary
Nowadays, various study of brain is carried. It can show you what happens in the brain, even when you become in love.
In your brain, romantic love is shown as the most powerful sensation. The A10 cells become active. It makes and sprays dopamine more. The brain circuit for the reward is working more when you can't get the love you want. It's figured out that romantic love is a drive, a basic mating drive. Not the sex drive. It's also figured out that it's an addiction.
The brain has areas that are associated with intense romantic love. However, it's not been clearly figured out why you fall in love with one person rather than another yet. It seems that there's a biology to that.
Even if you understand all kinds of brain mechanisms, men and women firstly have different brain systems. Especially, love is deeply embedded in the brain. They have to understand each other well. 
Words in this story
circulate /ˈsɜr kyəˌleɪt/ move
circuit /ˈsɜr kɪt/  line, lap, turn,
tolerance / patience,
withdrawal /  separation
relapse / recurrence
intense / xtreme, great, acute, fierce, severe, high.