• Many people seek to learn as the opportunity arises even if the reward of the game isn't of any material value, that is why many people still enjoy playing sudoku amongst other things.
• The motivation to join in an intrinsically rewarding activity - like solving problems - has been shown to decrease when a payment is introduced.
• Rewards in the real world often come in uncertain amounts. However, the good news is that regardless of what may be, learning has the potential to boost happiness.

The happiness of the subjects did not depend on how large the rewards were. Instead, the momentary happiness depended on the outcomes of their expectations.

The process of learning how the experimented game worked made people feel good rather than the reward they won.