| If you can free-fuse the stereograms, you should see that in one of
them the rectangular frame appears as a hole with a bar behind it, whereas
in the other the frame looks as a surface with a bar in front of it. Shimojo,
Silverman & Nakayama (1989)
noted that when the bar is seen through the hole, the bar moves perpendicularly
to its orientation instead of downward as in the barberpole effect. Apparently, the effect of the terminators on the global percept
is attenuated or perhaps completely abolished when binocular disparity
information suggests that the terminators are not real object endings,
but spurious discontinuities caused by occlusion. |
