Claim, believed that children's thinking progresses along an observable and describable route. Children need to develop concepts before they use the appropriate language., Key concepts, Cognitive development, Evidence for (1), Object permanence: before around 18 months idea of ‘out of sight out of mind’. At this age they start to realize that objects continue to exist even if they are out of sight, Evidence (2), Lack of understanding: overextensions happen because they don't understand concept of objects having different meanings, Evidence (3), Lack of understanding of this concept of object permanence limits the child's language -> once concept is understood the child will stop using underextensions, Evidence against (1), Childs reception has outstripped their production, Evidence against (2), Clear correlation between stages of intellectual development and language acquisition, Piagets primarily belief, Children develop their own understanding through exploring and questioning the world around them..

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