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Transparent surfaces defined by implicit X junctions: Erratum.

Reports an error in the original article by T. Watanabe and P. Cavanagh (Vision Research, 1993, Vol 33[16], 2339-2346). Lines 14-25 on page 2345 should read, "Anderson and Nakayama (1992) and Fujita (1992)." (The following abstract of this article originally appeared in PA, Vol 81:12292.) An X junction is known to be a strong cue for transparency whereas a T junction typically indicates occlusion by an opaque surface. In an experiment with 4 observers, in which luminance in a section of the figure was varied, 2 cases in which special T junctions (implicit X) can support the perception of a transparent surface were demonstrated. The T junction was perceived as having an additional illusory contour rendering it as an implicit X junction. Findings show a physically realizable condition in which transparency can produce a T junction; the existence of this special case may explain why T junctions are not necessarily taken as cues for an opaque surface. The similar processing for X junctions and implicit Xs to form transparent surfaces is suggested. (PsycINFO Database Record (c) 2007 APA, all rights reserved)