Abstract

blindness seems especially paradoxical: it implies that identifying "forest before trees." For later vision with processing has proceeded to the level of determining scrutiny, reverse hierarchy routines focus attention that one element is a conceptual or categorical repeti- to specific, active, low-level units, incorporating into tion of another---a repetition to which we are then blind. conscious perception detailed information available How can we know that two elements are similar if we there. Reverse Hierarchy Theory dissociates between are blind to the double occurrence? A similar paradox early explicit perception and implicit low-level vision, appears when we briefly view a scene containing many explaining a variety of phenomena. Feature search elements. We can more easily report the average value "pop-out" is attributed to high areas, where large re- of a parameter (such as the mean size or orientation of ceptive fields underlie spread attention detecting cat- elements) than ju

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