Briefly discuss the classic study by developmental psychologists Gibson & Walk and the "visual cliff."
What will be an ideal response?
Answer: In this 1960 study, infants were placed on a sheet of heavy glass and a checkered pattern appeared under one-half of the glass sheet, making it appear that the infant was on a stable floor. In the middle of the glass sheet, the pattern dropped down several feet forming a "visual cliff." The researchers asked whether infants would willingly crawl across the cliff when called by their mothers. The results were ambiguous, although most of the 6 to 14-month-old infants could not be coaxed over the cliff. This indicated that the ability to perceive depth had been developed by most of the infants. But the experiment did not pinpoint when depth perception had emerged in the infants since only the infants who had learned to crawl were involved in the test. Further, this experiment does not tell us whether the infants responded to depth, or merely to change in visual stimuli, when they moved from lack of depth to depth.
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a) 6 b) 3 c) 5 d) 4