Categorizing pictures at age 4 (7155.0K) A 4 year-old is presented with pictures of a lion, bear, zebra, and wagon and asked which one is different from the others. He insists, "They're all different!" The interviewer probes him but he is more interested in adding and subtracting pictures, which he does very well. Another set of pictures is presented to him and again he says that all are different.
Lacking concept of liquid conservation at age 3 (2838.0K) A 3-year-old girl demonstrates that she lacks an understanding of the concept of conservation when she is presented with Piaget's classic Liquid test. Charlene's explanation for "which has more" is a good example of how preoperational thinking is irreversible.
Lacking concept of mass conservation at age 4 (1752.0K) A boy who paints his nose a different color everyday (here, he is having a brown day), demonstrates that he lacks an understanding of the concept of conservation when he is presented with Piaget's classic Mass test.
Understanding liquid conservation at age 4 (2168.0K) A girl proves she has an understanding of the concept of conservation when presented with Piaget's classic Liquid test. This clip provides a good example of the age variation in the emergence of conservation.
Categorizing pictures at age 4 (7155.0K)