> But last year neuroscientists discovered that it plays an important role in the reward response - one of the main drives that motivate and shape human behavio

> But last year neuroscientists discovered that it plays an important role in the reward response - one of the main drives that motivate and shape human behaviour. There. That's probably what you came here for. Read the rest if you want details. But if like me you just wanted to know what "role" the headline is referring to.. There you have it.