Inability to Conserve
As discussed in class, the preoperational stage of Jean Piaget’s cognitive developmental theory covers children from ages two to seven. This stage is most known for the explosion of mental representation capacity. One area that takes some time for children to learn is within the area of conservation. Conservation is the principle of certain physical characteristics remaining the same when outward appearance changes. Piaget was able to prove that children in the preoperational stage showed an inability to conserve.
In the book, examples of this are explained in the form of number, mass, liquid, and weight. With number, a child would see there to be a different number of objects if the same ten objects were moved into a different pattern. With mass, a child would think there was a different amount of clay used if there were two identical balls of clay, and then one of the balls was rolled into a different shape. With liquid, a child would think there was a different amount of liquid in a glass if there were two identical glasses of liquid, and then one was poured into a wider glass. With weight, a child would think there was a difference in weight if the child saw two identical balls of clay, and then saw one of the balls rolled into a different shape.
Although the inability to conserve is present at the preoperational stage, within a few years, children start to develop the ability to conserve. Conservation of number, mass, and liquid usually come between six and seven years old. While conservation of weight can take a few more years, typically being acquired somewhere between the ages of eight and ten.
Ryan Van Wagenen