Baby Stephan is participating in a study designed to test infants' depth perception.The researchers place him on an apparatus, which consists of a large, transparent pane of glass with two checker-patterned displays below it.On the far side, the pattern is roughly 3 feet below to give the impression of a sudden drop-off.Baby Stephan is on a:

Question

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The description matches that of a visual cliff, which is a device used to test depth perception in infants. The checker-patterned displays create an illusion of a sudden drop-off, and the infant's reactions are observed to determine if they perceive the depth and hesitate or avoid crossing the "cliff."

Baby Stephan Is Participating in a Study Designed to Test