In other words, if we train our brains to be optimistic or pessimistic -- to navigate, intentionally or not, the streets and avenues of positive or negative feelings -- we change (just as cab drivers do with their spatial circuits) the emotional circuits in our brains that determine how we respond to the things that happen around us.

CNN: Make your 'rainy brain' sunnier

This mixed opinion makes it difficult to make any prediction for the future, but what is clear is that companies with a positive or optimistic view of the US economy will be more likely to want to drive innovation and change.

FORBES: Innovation and Growth: Which Comes First, the Chicken or the Egg?

But he was optimistic he will be able to end his seven-year career racing for the French team with a positive result.

BBC: Superb Hamilton storms to pole