Double Conjuction of Orientation and Luminance Polarity

Papathomas TV, Gorea A, Fehér A, Conway TE. "Attention-based texture segregation," Perception & Psychophysics, vol. 61(7), 1399-1410, 1999.

  

Do you see a vertical edge in this image?
See from figures B and C below.
"So, as you see form Figures B and C, there IS a vertical edge in Figure A. It is masked by the so-called "double conjunction" of the orientation and polarity (black/white).

what is on Figures B and C?

Only the white bars of image A are shown Only the -45 degree oriented bars of image A are shown

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