visual cliff- a researcher places a checkered cloth over a a table or other raised surface that extends over the table, floor, everything around. Then, a piece of clear plastic or glass is placed on the raised surface so that it extends out from the surface. This gives the appearance, when looking from the top of the clear material, that there is a cliff. A child is placed on the table/surface and the mother stands at the end of the clear plastic or glass, and calls for the child to crawl to her. If the child simply crawls to her, over the edge of the table on the plastic, then the child has not yet developed depth perception. If the child stops at the edge of the table and looks down, but refuses to crawl to the mother, than it can be inferred that the child does have depth perception. depth perception is usually exhibited between 6 - 14 months; At that point, children are less likely to crawl over the edge of the table. 2. preference for visual stimuli
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