The visual cliff is a device for testing infants'

Question

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The visual cliff is a device that tests an infant's depth perception. The device looks like a table with a clear glass surface that creates the illusion of a drop-off. When an infant is placed on the "cliffside" and someone on the other side calls to them, infants who are capable of depth perception will not crawl off the edge. This test is commonly performed on babies between six and fourteen months old.

The Visual Cliff Is a Device for Testing Infants