Neurologists account for the critical period phenomenon with the concept of lateralization. Lateralization is the process by which the brain assigns one specific function to each part of the brain as it matures. Coincidentally, this process occurs at the same time as the critical period for language acquisition, and ends at the same time as this critical period ends suggesting that the two phenomenon might somehow be connected. During this process of organizing the brain’s functions, the language functions mostly end up located in one part of the left hemisphere and become closely associated with other left brain functions such as logic, and analysis. Once this process is completed these functions are fixed and cannot be moved. Neurologists believe that this process is necessary for forming functional adult brains, but it has many negative side effects on language learning. The first of these negative side effects is that adults develop a tendency to approach language learning analytically and neglect to use their right brain and all the strategies it provides. This is due to the fact that language for adults is a left brain function removed from potentially useful right brain functions such as intuition and creativity. Because adults generally use only part of their brain, and therefore have such limited learning strategies, they are unable to do the complicated processing involved in language learning. The second major side effect of lateralization is caused by the loss of neurological plasticity --- the fixed nature of the adult brain. Because adults cannot move any of their brain’s functions around, and each part already has an assigned function, they cannot free up any space for a new function as big as a second language. Both of these side effects can help explain how children’s brains react differently to the introduction of a second language, as well as their ability to learn it with an ease that would make any adult envious.