A good example of a child's problem solving or explorative skills would be the 'Hidden Toy Experiment' because it shows how what Piaget called the sensorimotor stage begins to become more sophisticated as the child starts to put two and two together in his environment. Before about 7 months the baby will be very accepting of its visual reality not understanding the complexities of perception and abstract concepts and this stage starts at birth and goes on to about 2 but developing sophistication as it goes on. This lack of understanding and reliance on reflexes also makes the baby very egocentric.It is learning mostly by trial and error, and cause and effect as its reflexes make stuff happen, then it starts remembering learnt consequences and applying them next time. Babies depend upon their reflexes and change them to fit to their perception of the environment. They quickly learn cause and effect, often manipulating situations to get the goals they want and these goals become more abstract as the child gets older and so can 'keep things in their heads.' This is where the Hidden Toy comes in, as the child needs to have a perception of the toy, even after it cannot see it. Object permanence is said to have been achieved by the baby if it carries on looking for a toy covered by something after it has discovered it cant see it. Before this stage is reached , the child simply reacts as if the toy has gone for ever.