Discuss what is known about infant depth perception and the visual cliff, drawing on the research by Gibson and Walk
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+ Depth perception:
- The visual cliff, a glass-covered platform with a deep side and a shallow side under the glass, which has been used to assess infant depth perception.
- Visual cliff experiments suggest that infants can perceive depth by the time they are old enough to crawl.
- Babies as young as 1½ months can detect a difference between the shallow and deep sides of the visual cliff (as evidenced by heart rate deceleration, a sign of interest), but only older, crawling babies are actually afraid of the deep side (as evidenced by heart rate acceleration, a sign of fear). Infants infer depth using several kinds of cues: retinal disparity, linear perspective, texture gradient, relative size, and interposition.
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