Decisions Made Through the Eye

In the movie Blade Runner, The Voight-Kampf test was used to distinguish humans from replicants by testing the fluctuation of the pupils and the involuntary dilation of the iris.

Our pupils are known to dilate when we are under heavy stress as a part of the fight-or-flight response. Noradrenalin is a hormone found during times when our pupils dilate; it suggested that noradrenalin can also influence our memory and decision-making ability.

Pupils dilate when viewing optical illusions; in the spinning woman image (above), it is suggested that noradrenalin essentially makes us decide upon the direction the woman is spinning before it appears to actually happen.

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New Scientist: Decision-makers betrayed by their wide eyes

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