How does adaptation to disparity affect the perception of reversible figures?

The finding of Virsu in 1975 that prior adaptation to a version of the Schröder staircase with disparity tends to produce the opposite perspective interpretation of a subsequently presented zero-disparity stereogram was confirmed. A similar pattern of results was found when the test field was monocularly rather than binocularly presented, even after an interval of 30-60 seconds. The origin of the effect is discussed in the light of this new evidence.