Brain development during early childhood depends on many factors. As the brain develops, cognitive, social, and language acquisition activities expand. During cognitive development, language will emerge naturally. Many factors influence brain development. As noted in Child Development, early brain development is increasing at a rapid rate. The brain slows its growth after early childhood until there is another surge toward adolescence. The brain reaches approximately eighty percent of its adult weight by early infancy. Around age five, the brain is closer to ninety percent of its adult weight. Many important changes occur during this slower period of the early brain stages. “As seen in the brain, growth allows myelination to continue. Myelination occurs when the brain increases the propagation of neuronal impulses to various areas of the head. During early childhood, myelination occurs in the frontal cortex portion of the brain. This promotes a more cognitive protocol for the child” (Lightfoot, Cole 2013). At this stage the brain is developing and continued growth will take place. Memory materials are still very immature, and the brain develops at varying rates and makes its connections at unusual times. This could explain uneven cognitive progress during early childhood. As myelination occurs at a rapid rate in cortical areas, growth occurs in psychological locations of the brain (Lightfoot, 2013). Conversely, when brain systems are immature, little performance is apparent. Language acquisition in early childhood could be determined by a biological explanation. This can show how the brain is wired for children to acquire language at every point of paper development in various regions. Language acquisition is the result of how the brain is formed early in life. Memory is an important cognitive function that enhances complex thinking during early childhood. One of the topics that interests me a lot is traumatic brain injury. I had two concussions in high school. After the second, I slowly lost my speech and could no longer speak. It was a very difficult time and there was little I could do to resolve the problem. The speech finally returned after about 4 weeks. The effects of language acquisition after injury on an adult may have more serious consequences than those of early childhood brain damage. These traumas result in the participation of athletes practicing contact sports. A deeper understanding of the long-term effects of this type of injury on adults is an area I would like to learn more about..