A study found that children over age 3 who grew up with older brothers or sisters performed better on a cognitive task than did children with no siblings or younger siblings.This is consistent with the concept of _____________________.

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This is consistent with the concept of the zone of proximal development, which refers to the range of tasks that children can perform with the help of more knowledgeable individuals or siblings. Older siblings can serve as a source of scaffolding and support for younger siblings, which can help them to develop cognitive skills and abilities.

A Study Found That Children Over Age 3 Who Grew