Scientists report on visual adaptation - when eyes get adapted to a constant stimulus, and then a changed stimulus is presented, the adaptation aftereffects are not only sensory, but also higher level perception/decision-making (after see happy face for long, a neutral face will appear sad)

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Scientists report on visual adaptation - when eyes get adapted to a constant stimulus, and then a changed stimulus is presented, the adaptation aftereffects are not only sensory, but also higher level perception/decision-making (after see happy face for long, a neutral face will appear sad)