What is Rob Kurzban's measure-motivate theory of emotions?

Rob Kurzban told Chris Williamson on Modern Wisdom that every feeling does two jobs. First it measures something, inside the body like blood glucose or outside it like how close a bear is. Then it motivates an action that fits the reading. Simple feelings such as thirst take simple measurements, while jealousy has to estimate whether another person threatens a relationship. Kurzban argues that conscious experience is the common currency that lets the brain compare, say, three units of hunger against four units of fear.

• Kurzban contrasted people with a thermometer or a Waymo, which juggle far fewer competing goals.
• Kurzban credited a physicist's line that everything that exists exists in some quantity.
• Kurzban said pain must feel bad to work, since people who lack it die young from unnoticed damage.

▸In their words

“And so I think consciousness, this experience we have is that common currency.” Rob Kurzban · at 3:23 — open in the transcript →

Source: our own transcription of the episode. The full conversation is on Modern Wisdom (2026-10-29). Read the whole episode summary →

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