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Visual cliff
The visual cliff apparatus was created by psychologists Eleanor J. Gibson and R.D. Walk at Cornell University to investigate depth perception in human and animal species. This apparatus allowed them to experimentally adjust the optical and tactical stimuli associated with a simulated cliff while protecting the subjects from injury.〔 (copy )〕 The visual cliff consists of a sheet of Plexiglas that covers a cloth with a high-contrast checkerboard pattern. On one side the cloth is placed immediately beneath the Plexiglas, and on the other, it is dropped about 4 feet below. Since the Plexiglas supports the weight of the infant this is a visual cliff rather than a drop off.〔 Using a visual cliff apparatus, Gibson and Walk examined possible perceptual differences at crawling age between human infants born preterm and human infants born at term without documented visual or motor impairments.
==The original visual cliff study==
Gibson and Walk (1960)〔 hypothesized that depth perception is inherent as opposed to a learned process. To test this, they placed 36 infants, 6 to 14 months of age, on the shallow side of the visual cliff apparatus. Once the infant was placed on the opaque end of the platform, the caregivers (typically a parent) stood on the other side of the transparent plexiglas, calling out for them to come or holding some sort of enticing stimulus such as a toy so that the infant would be motivated to crawl across towards them. It was assumed if the child was reluctant to crawl to their caregiver, he or she was able to perceive depth, believing that the transparent space was an actual cliff.〔Cherry, Kendra. (What Is a Visual Cliff? ) psychology.about.com.〕 The researchers found that 27 of the infants crawled over to their mother on the "shallow" side without any problems.〔(Watch Out For The Visual Cliff ). The Neuron (29 March 2009).〕 A few of the infants crawled but were extremely hesitant. Some infants refused to crawl because they were confused about the perceived drop between them and their mothers. The infants knew the glass was solid by patting it, but still did not cross. In this experiment, all of the babies relied on their vision in order to navigate across the apparatus. This shows that when healthy infants are able to crawl, they can perceive depth.〔 However, results do not indicate that avoidance of cliffs and fear of heights is innate.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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