Scott Johnson did research in the area of perception of occluded objects.In his research he found that learning,experience,and self-directed exploration via eye movements play key roles in the development of ______ completion in young infants.

A) constancy
B) perceptual
C) size
D) sensational

The research by Scott Johnson was on the perception of occluded objects, which falls under the category of perceptual completion. He found that learning, experience, and self-directed exploration via eye movements play key roles in the development of perceptual completion in young infants. Therefore, the best choice is B) perceptual. The other options, such as constancy, size, and sensational, do not directly relate to the research done by Scott Johnson.