In her experiment in which a toy is hidden in both a room and a scale model, Judy DeLoache found that

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Judy DeLoache's experiment demonstrated that older children were able to understand the symbolic relationship between the scale model and the room, allowing them to successfully use the model to find the hidden toy. Younger children, typically around two-and-a-half years old, struggled with this concept and were not successful in using the model to locate the toy. This finding supports the idea that the ability to understand and use symbols develops with age.

In Her Experiment in Which a Toy Is Hidden in Both