Caroline wonders whether her 10-month-old daughter can perceive depth well enough to avoid crawling over the edge of a tall platform in her church auditorium. Researchers could safely assess her daughterโs perceptual ability usingA) a visual afterimage. B) a Necker cube. C) a visual cliff. D) the Moon illusion.

The correct answer is letter C

In the visual cliff experiment by Eleanor Gibson and Richard Walk they used a table that had a surface that was half transparent thick glass and the other half made of non-transparent solid material. This created an illusion of a small cliff without the real dangers of falling for babies between 6 and 8 months old who were chosen to participate in the interesting experiment aimed at discovering some of the mysteries of human perception.

The children were placed on the non-transparent part of the table, while their lactating mothers were positioned on the other side of the table and the visual cliff, trying to convince their shoots to come to them.

According to the results of this experiment, of the 36 babies evaluated, 27 of them crossed the glass surface without much problems, although some have crawled hesitantly. But 9 of them flatly refused to crawl because they were confused by the possible fall between them and their mothers. The children, supporting with their little hand, knew that the glass was solid, but they did not cross.

This behavior allowed researchers to infer, in a very clear way, that our perception of depth matures more quickly than our driving ability. Furthermore, on a practical level, the reaction they experienced in this test shows the children's inability to protect themselves in a similar situation in their real lives and so we understand why it is important to draw attention in environments that include hazards like the previous one. The results did not indicate that fear of heights or the notion of danger are innate.

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