This research was partially supported by the Pew Science Education Research Program at Cornell University and NSF Grant BCS-9727841. Portions of this research were reported at the Association for Research in Vision and Oph thalmology meeting at Sarasota, Florida; the Second Annual Meeting of the Cognitive Neuroscience Society, San Francisco; and the Neural Correlates of Consciousness Meeting, Bremen, Germany. I thank Christof Koch and Romi Nijhawan for discussions regarding the issues raised in this paper.

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