Slide your hand into your coat pocket and find an old, folded $100 bill. In the other pocket, you find a coin.
Now, here’s the gamble: flip the coin. Heads, you win another $300. Tails, you hand over your $100 bill. Do you take the risk?
Mathematically, you should. One coin flip gives you two equally likely futures: in one, heads, you gain $300; in the other, tails, you lose $100.
Because each future has a 50 per cent chance of happening, you count half of each outcome: half of $300 is $150, and half of $100 is $50. Balance those against each other, and taking the gamble puts you $100 ahead on average. Decision scientists call this positive expected value.
Even when someone grasps the mathematics, however, it’s hard to take the risk. Why?
About 50 years ago, the psychologists Amos Tversky and Daniel Kahneman showed that this hesitation is not random. People depart from logic in patterned ways. One of the most durable patterns is loss aversion: our tendency to feel the pain of losing more sharply than the pleasure of an equivalent, or even greater, gain.
This is where mindfulness becomes interesting. Mindfulness is usually defined as paying attention to the present moment, on purpose, without immediately judging what is happening. In practice, that can mean noticing a thought before believing it, feeling an emotion before acting on it, or returning attention to the body, the breath, or the world around you. At its simplest, mindfulness creates a pause between what arises in the mind and what we do next.
That pause helps because many of our choices are made before we have fully examined them. We may think we are deliberating over the coin toss, but often the body has moved first: recoiling from loss or preserving a decision simply because we have already invested in it. These mental shortcuts are called cognitive biases, and the study of this kind of human misjudgment is central to decision science.
When we hesitate at the coin toss, we might be deliberating – but often, we’ve already decided.
Some biases are driven by emotional projection, some by inattention, and others by a failure to stay engaged
Impulse has its benefits. A mind that had to reason from scratch every moment would be paralysed. But when these shortcuts override reflection, they can distort the decisions we make. Without careful thought, a patient may fail to seek the best medical care. People lose wealth because they cling to their current savings plans. You might know the feeling of preserving a job or a relationship simply because you invested so much in it. Internally, these cognitive biases feel instinctive. The question is whether we can catch these instincts before they harden into choices we mistake for reason.
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