INDUCED EFFECTS OF BACKGROUNDS AND FOREGROUNDS IN 3-DIMENSIONAL CONFIGURATIONS - THE ROLE OF T-JUNCTIONS

In three-dimensional configurations, and two-dimensional pictures of s uch configurations, simultaneous contrast induction from proximate bac kgrounds affects perceived brightness, color, and internal contrast to a greater extent than induction from coplanar or occluding surrounds or from more distant backgrounds. In the projected image the presence of occluding flanks or retinally adjacent distant backgrounds is indic ated by T-junctions. However, the presence of T-junctions inhibits ind uced contrast irrespective of the three-dimensional percept. The confi gurations in this paper refute the notions that perceived coplanarity or perceptual belonging necessarily enhance induced contrast.