For studies of the development of attention throughout infancy, you might look up the research of Adele Diamond (e.g., with the Piagetian object permanence task). For its development in toddlerhood you might look up the dimensional change card sort task. And for research that spans early childhood into adulthood, you might look up Robert Kail. What’s tricky, especially with infants and the youngest children, is designing tasks that clearly distinguish different executive functions. Best wishes with your research, Hamed. ~ Kevin
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