When you sit down to make a decision under pressure, the feeling of clarity you get — that sense of 'I've thought this through' — often arrives before the thinking is actually finished. The 18th-century Scottish philosopher Thomas Reid observed something his rationalist contemporaries kept missing: that our minds are not blank slates weighing evidence, but active interpreters that reach conclusions through a kind of perceptual snap, then construct reasons afterward to justify them. Cognitive scientist Keith Stanovich later named the pattern 'myside bias' — the tendency to evaluate evidence not by its quality but by whether it confirms the conclusion we've already quietly reached. The practical move is simple but uncomfortable: after you've 'decided,' give yourself five minutes to argue sincerely for the opposite position — not to change your mind, but to discover whether your original reasoning was architecture or decoration.

Think of a decision you made in the last month that felt well-reasoned. What evidence against your conclusion did you actually seek out — and what did you do with it when you found it?

Drawing from Scottish Common Sense Philosophy / Cognitive Science — Thomas Reid & Keith Stanovich