[Purpose] A brightness difference between two identical gray stimuli on uniform light and dark surrounds becomes larger when the surrounds are replaced by the ones composed of many small patches having different luminances (a??articulateda?? surrounds) while keeping the space-averaged luminance constant. To explore visual mechanisms underlying this articulation effect in view of global vs. local processing, the present study introduced the perception of transparency over the dark surround by manipulating global stimulus configuration alone, and investigated its effects on brightness perception on the surround.
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