If the extrovert is trying to "cheer up" the introvert - extroverts are programmed to seek social rewards! - he or she may feel like a failure if the introvert remains unmoved.
It's almost a blessing when we meet people who naturally want to do the sort of things that are in high demand in society. What a gift to do that, as opposed to other people who would say, 'I want to be a novelist but actually I have to be an accountant.'
The biggest neurological turn-on for people is other people. This is what really excites us. In reward terms, it's not money; it's not being given cash - that's nice - it's doing stuff with our peers, watching us, collaborating with us.
Once women find a way to form community, everyone reaps the rewards.
Extroverts are more attuned to social rewards, so they are more likely to flash a smile for effect. A notable exception are introverts - like me - whom I call "socially accessible" introverts. We have been trained well to smile and nod, which can place a burden on our processing efforts.
Once you find out that someone likes a certain game on Facebook, now you know what kind of virtual gift you can get them. You can send them a little decoration. Social games give you goals where you can help and reward your friends.
What teenagers want most of all are social rewards, especially the respect of their peers.
