Mo Constandi writes: “Research published last year shows that pupil dilation is linked to the degree of uncertainty during decision-making: if somebody is less sure about their decision, they feel heightened arousal, which causes the pupils to dilate. This change in the eye may also reveal what a decision-maker is about to say: one group of researchers, for example, found that watching for dilation made it possible to predict when a cautious person used to saying ‘no’ was about to make the tricky decision to say ‘yes’. Watching the eyes can even help predict what number a person has in mind. … Watching eye movements can also be used to nudge people’s decisions. One recent study showed – maybe worryingly – that eye-tracking can be exploited to influence the moral decisions we take.”

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