When they opted instead to wait to receive the bigger amount later, the prefrontal cortex was more active, suggesting rational calculation was at work.

We simply don't know the value of our education, and so decisions are more likely to reflect aversion to debt than rational calculation.

It was not a rational calculation, or a cost benefit analysis; it was an act of spontaneous humanity.

They found that people's decisions were based not on a rational calculation, but on how the experimenter's questions were framed.

This opens the door to why many decisions are based on narrative explanations that circulate in groups, rather than on the rational calculations of probabilities derived from individual observation.