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In the article, two main ideas are presented about time perception: engagement and focus. Focus makes time seem to pass more slowly because your brain has to process more information. This makes you think that the moments are longer, because it seems like more happened in that time. This is part of why children feel the passage of time more; they have to focus on everything in their environment in order to make sense of it and act appropriately.
Engagement, on the other hand, makes time seem to pass more quickly because we ignore the seconds passing while we are performing tasks. Time feels unimportant when we are very involved in doing something.
The author suggests using a discussion of processes to distract children from focusing on time (which would make the time seem even longer) and involving children in processes in order to provide engagement.