When the objects were presented in a sparse array, search times to find the target were similar for displays composed of simple and complex objects. But when the same objects were presented as dense clutter, search functions were steeper for displays composed of complex objects.

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People think that you search based on objects. You think you're seeing everything, but you're really seeing very, very little.

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Weapons can come in any form. Baggage checkers don't know exactly what they're looking for.

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