From a recent book review: Jonah Lehrer's mission in The Decisive Moment is to help us determine when to override our instincts and when to let them run. … One of Lehrer's interesting recommendations [is]: trust your emotions in situations where you have had a lot of experience, since this is when [your brain is] … best equipped to warn you of any deviations from their established patterns. In novel situations, on the other hand, such as when playing a new game or considering a risk to your health, it is a good idea to take a step back and do the maths, even though your emotional brain will tell you it knows better.