There is a reason why stimulants used to treat ADHD work so well – Noradrenaline is a powerful modulator of attention. This is not surprising when you think back to our evolutionary past. If your distant ancestors encountered a dangerous animal, it would be fatal if their mind drifted off and started thinking about that lovely cave painting they just finished. Your brain triggers the release of noradrenaline to tell you “This is really important so you’d better pay attention”.
