Definition: A visual cliff is a type of tool that was originally designed by developmental psychologists to study whether or not an infant has depth perception. It involves connecting a transparent glass surface to an opaque patterned one in order to create an apparent but not actual drop. This creates the illusion of a cliff, while protecting the child from injury.
Learn more about how this tool is used in psychology research in this definition of a visual cliff.
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Image courtesy Piotr Bizior