Impact Bias

Shrink Definition

Impact bias is our tendency to overestimate how intense and how long a future feeling will be. We expect a win to thrill us or a loss to crush us for far longer than either does. A psychological immune system quietly helps us adapt, which we forget to factor in. The feeling is usually shorter and milder than predicted.

Plain language

We overestimate how strong and how long future feelings will last.

Shrink Insight

You'll adapt faster than your forecast believes.

Why it matters

It distorts decisions we make to chase or avoid feelings, and it feeds needless dread and disappointment. Knowing it can steady big choices and soften anticipatory fear.

Common misunderstanding

People assume a big event will feel as intense as they predict for as long as they predict. We adapt more quickly than we expect, in both directions.

Shrink Perspective

Your future feelings are more resilient than your forecast of them.

Shrink Reflection

What outcome am I overrating the emotional size of?

Shrink Step

Before a feeling-driven decision, cut your predicted intensity and duration in half.

Shrink Minute

Recall an outcome you dreaded or craved that faded faster than expected.

Shrink Takeaway

The feeling fades faster than the forecast says.

Medical boundary

Evidence summary

A robust finding in affective forecasting research, though the size of the bias varies by event and method.