Dr. Steven Hughes, a neuroscientist and parent of a Montessori child, explains that he became interested in studying the effects of Montessori education on children after he noticed that, “Montessori children are just good at doing things.”

What does being good at doing things mean?

Executive Function is the term that comes to mind, which encompasses
being flexible, planning, time management, impulse control and working memory.

In Montessori academic work is important and emphasis is placed on it earlier
than in other pedagogies, but what’s of equal importance is the acquisition of
some skills that are important for a person to be emotionally intelligent, well rounded, and responsible.

Dr. Steven Hughes does a much better job of explaining it in the article. Here’s the link.