Intelligence hides in plain sight

We assume smart people are organized, cautious, and curious. But intelligence actually shows up in unexpected personality traits we often miss.

Scientists studied altruism and IQ

Researchers Kobe Millet and Siegfried Dewitte examined whether generosity connects to intelligence using evolutionary signaling theory.

The experiment: give or keep

Three hundred and one participants played games where they either donated resources to others or kept them. Researchers measured their intelligence alongside their choices.

Generous people scored higher

Those who contributed more than their fair share to public goods tested as more intelligent. Valuing collective benefits over personal gain also linked to higher IQ.

“unconditional altruistic behavior is linked to general intelligence”

Why smart people give more

Intelligent people can afford generosity because they expect to earn resources back later. High cognitive ability predicts future financial success, so they give confidently.

“people with higher IQ generally have more resources or can expect to recover what they gave later”

Altruism costs less for the clever

The cost of giving is lower for highly intelligent people than less intelligent ones, since they're confident they'll recover what they've spent.