In their experiments, an electrical current was sent to the limbic system of a rat's brain whenever it moved to a certain area of its cage.

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Generally, acts of self disclosure were accompanied by spurts of heightened activity in brain regions belonging to the meso-limbic dopamine system, which is associated with the sense of reward and satisfaction from food, money or sex.

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These blindingly fast decisions occur in the limbic system and happen long before the more conscious part of the brain processes the data and reaches a conclusion.

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It is surely no coincidence that much of the activity Dr Okubo found is in that characteristically human part of the brain, the enlarged cerebral cortex, rather than in the limbic system.

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