Salience Bias

The tendency to overweight information that is emotionally striking, unusual, or attention-grabbing—and underweight information that is routine, statistical, or abstract. A single vivid story of a plane crash affects risk perception more than a lifetime of safe flights. One dramatic customer complaint overshadows thousands of satisfaction surveys. A charismatic presentation dominates a decision more than a thorough written analysis. Salience bias means that the VIVIDNESS of information predicts its influence on decisions better than its RELEVANCE or ACCURACY.

When to use it

When dramatic events are disproportionately influencing decisions; when anecdotes are overriding data; when emotional vividness is trumping analytical rigor; when the most memorable piece of information is being treated as the most important.

How it can help

When making decisions: actively seek out the non-salient information that salience bias suppresses. After any vivid piece of evidence, ask: 'what does the boring data say?' The vivid customer complaint should be weighed against the full satisfaction data. The dramatic failure should be weighed against the base rate of failures. The charismatic presenter's argument should be evaluated on content, not delivery. The practice: delay decisions until you've balanced vivid anecdotal evidence with systematic quantitative evidence. If your decision would change based on which type of evidence you privilege, salience bias is active.