reinforcing the child's current activity. He theorized that as the child matures cognitively and socially the amount of egocentric speech used would be reduced. However, Vygotsky felt that egocentric speech has more meaning, as it allows the child's growth in social speech and high mental development. In addition to Piaget's theory, he believed that when communicating with others, the child believes that others know everything about the topic of discussion and become frustrated when asked to give further detail. Piaget also believed that egocentrism affects the child's sense of morality. Due to egocentrism, the child is only concerned with the final outcome of an event rather than another's intentions. For example, if someone breaks the child's toy, the child would not forgive the other and the child would not be able to understand that the person who broke the toy did not intend to break it. This phenomenon can also be backed by the evidence from the findings of the case study by Nelson, who studied the use of motives and outcomes by young children as aiding to form their moral judgements. Piaget did a test to investigate egocentrism called the mountains study. He put children in front of a simple plaster mountain range and then asked them to pick from four pictures the view that he, Piaget, would see. The younger children before age seven picked the picture of the view they themselves saw and were therefore found to lack the ability to appreciate a viewpoint different from their own. In other words, their way of reasoning was egocentric. Only when entering the concrete-operational stage of development at age seven to twelve, children became less egocentric and could appreciate viewpoints other than their own. In other words, they were capable of cognitive perspective-taking. However, the mountains test has been criticized for judging only the child's visuo-spatial awareness, rather than egocentrism. A follow up study involving police dolls showed that even young children were able to correctly say what the interviewer would see. It is thought that Piaget overestimated the extent of egocentrism in children. Egocentrism is thus the child's inability to see other people's viewpoints, not to be confused with selfishness. The child at this stage of cognitive development assumes that their view of the world is the same as other people's. In addition, a more well-known experiment by Wimmer and Perner (1983) called the false-belief task demonstrates how