Do you take on the mien of a mobster when you’re hungry? Do you turn into a tyrant when you’re tired? While most of us are very aware of how our physical or emotional state can affect our personality, economist Noreena Hertz says we need to pay equal attention to how it can affect our ability to think rationally. For example, research shows that hunger hormones are directly linked to decision-making and impulse control.  

In today’s installment, see how happiness, stress and even arousal can lead us to act in surprising ways.

See Part 1 and Part 2 of this video series.