Background: Three Alternative Theories of Visual Selection

	Where does visual selection happen?	What is the function of visual selection?
location-based selection theories	early stage of visual processing	eliminating ambiguity introduced by distractors
object-based selection theories	late stage after object representations are contructed	dealing with the competition for limited resources
object selection mediated by location selection	early stage of visual processing	eliminating ambiguity introduced by distractors

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