Answer:
Fear
Explanation:
Visual cliff involves an apparent drop from one surface to another, (the drop is not real)
It was originally created to test babies' depth perception. It's created by connecting a transparent glass surface to an opaque patterned surface. The floor below has the same pattern as the opaque surface. This apparatus creates the visual illusion of a cliff while protecting the subject from injury. Depth cues allow people to detect depth in a visual scene.
This experiment was the brainchild of Gibson and walk, a child is placed on the visual cliff, a child whose depth perception isn't developed would happily walk on the visual cliff back to its caregiver
They concluded after the experiment that the ability to perceive depth emerges sometime around the age that an infant begins to crawl and they also suggested that the fear of heights, is something learned later in infancy as they gain experience with bumps, scrapes, and falls.