Researchers from University College London have come up with that weird bit of advanced squiggly maths, which apparently has the ability to accurately predict the happiness of a sample group of people.
The first phase of the test saw 26 people asked to make decisions while their brains were being scanned in an MRI machine. The brain activity and their responses to the question "How happy are you now?" led to the creation of the above formula, which combines self-reported happy levels with rewards and expectations.
The interesting thing about the research isn't just the obvious finding that rewards made people happy, with the study suggesting that positive people with high expectations tended to experience happier outcomes and feelings. [Time]