The Development of the Brain

Hank Walker

Development of the brain over a person's life time

Do you know why teenagers make impulsive decisions? Do you know how the brain develops over your lifetime? Learning about the brain development is important because it helps us learn more about ourselves and why we make the decision we do. Back in the day people thought that the brain stopped growing at age 10. Now we know that the brain is not fully developed until age 25. In teenagers the part that governs judgment is the last to be fully developed which is why teenagers make impulsive decisions.

The growth and development of the brain is a very important and complex process. In the book Injury,illness and Health, the author mentions that a new baby brain weighs about 350 grams, slightly less than one quarter of its adult size. The brain's final growth spree is during the teenage years, with full size reached at 14 to 16 years of age. From the article FREAKING OUT, it shows that the frontal cortex is where your brain processes information to help you make decisions. The cerebellum not only balances your body so it doesn't fall over but it also helps balance your thought processes. By the time you're an adult, your brain has activity patterns reflecting emotional maturity and improved executive functioning (Carter). In conclusion, it is important to learn about how the brain develops because it helps us understand about people in different stages of their life.

5 To Know Before You Go

  • The majority of the brain development does in fact take place in the early years.
  • When billions of synaptic that will last the child's lifetime are forming
  • Important development changes scientists are discovering are still taking place in a big way through the adolescent years and into the mid-twenties
  • Buy the time you are six your brain is 90-95 percent done
  • But massive changes continue to take place for at least another fifteen years
PBS The Secret Life of the Brain - The Baby's Brain (mini).wmv


Carter, Rita. The Human Brain. London: DK, 2009. Print.

Knox, Richard, ed. "The Teen Brain: Its Just Not Grown Up Yet." NPR, 10 Mar. 2010. Web. 12 Nov. 2015. <>.

Rou, Dana Mearchen. FREAKING OUT! North manlcato: Compas point, 2012. Print.