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The purpose of this project was to investigate the maintenance of focused attention in the first 5 years. In Study 1,67 children were seen at 1, 2 and 3.5 years of age in free play with a number ofage-appropriate toys. In Study 2, children at 2.5, 3.5, and 4.5 years were also seen in free play
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Ruff et al. (1990) studied this question.
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