Intentionality Bias

What is Intentionality Bias?

Intentionality bias is a tendency to interpret ambiguous human actions as deliberate. An observer may infer purpose before considering an accident or another explanation. It does not mean that people always see every action as intentional.

Evidence and limitations

Rosset’s experiments found more intentional interpretations under time pressure and when participants described ambiguous actions spontaneously. A proposed explanation is that an initial intentional interpretation sometimes needs to be overridden. However, two later experiments found that increasing working memory load did not increase intentional judgments, challenging this account.

Intentionality bias versus other attribution biases

Attributing intention is different from attributing a stable personality trait, rational thought, or hostility. These judgments can occur together.

Example of intentionality bias

Someone spills a drink beside you. Did they do it on purpose, or did their elbow catch the glass? The spill alone does not settle the question. Look for evidence of intent before turning an ambiguous event into a deliberate insult.

Hostile attribution bias specifically concerns reading hostility into ambiguous behavior.

Sources and evidence

• Evelyn Rosset (2008): It’s no accident: Our bias for intentional explanations
• A. E. Eisenkoeck, J. W. de Fockert and J. W. Moore (2025): Investigating the effect of cognitive load on the intentionality bias