儿童心理行为发育评价 观察法eat FIGURE 4-11 VISUAL CLIFF The "visual cliff"experiment examines the depth perception of infants.Most infants in the age range of 6 to 14 months cannot be coaxed to cross the cliff,apparently respond- ing to the fact that the patterned area drops several feet. In this illustration of the strange situation, the infant first explores the playroom on his own,as long as his mother is present.But when she leaves,he begins to cry.On her re- turn,however,he is immediately comforted and stops crying.The conclusion:he is se- curely attached.儿童心理行为发育评价 儿童心理行为发育评价 观察法