Brain Training for Preschoolers: Remarkable Growth The brain is the only organ that takes until early adulthood to fully mature and develop. A preschooler goes through tremendous brain development as they grow, as any parent can attest to. Brain training for preschoolers is critical for being prepared for the demands later in life. This is because many learning skills are developed during preschool years. Brain training for preschoolers should become a constant activity that is continually changing. - See more at: http://www.learningrx.com/brain-training-for-preschoolers-faq.htm#sthash.j7fjEgm9.dpuf