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leasant and friendly; started there will be sorrow, excitement, joy and other emotions. To 1 to 1.5 years old, they can say more than 50 words or phrases into the double with this phase. And they can understand simple questions, to listen to the parents’ request, improving skills, not to be used more to express their ideas more sensitive to the sentence.
When children grow up to 2 to 3 years old, their head develop more robust, the proportion of head and body tends to adults and their physical development also are on a higher level. At this time, the child's language ability, perceptual ability and intelligence have been greatly improved. Children can master a few simple words; vocabulary has expanded into the double-words stage. The child's instinct is still in the stage of thinking is inseparable from the perception of things and their own actions
In the third period, early childhood, mainly refers to the 3-year-old to 6-year-old. Children in this period, the brain structure and function continues to develop, body structure and organ function has been strengthened, and flexible body movements than before, began to coordinate each other. At the same time, their cognitive ability are improving, according to the object features and functions more flexible, accurate, and skilled operators, play with and construct a simple model. At this time the children have mastered certain oral, and gradually learn the correct pronunciation, understanding of the plain meaning of the word specific. Language into the rapid development period, to expressly indicate adults, and gradually can interact with others in simple sentences, often with a variety of gestures, facial expressions to aid expression. When they grow to six year old, they can not only vividly and systematically describe social knowledge, but also lively and expressive describe things, the flexibility of the language is increasing, to respond more quickly verbal exchanges with others, and can use the specification language, complete words.
1.2 Brain mechanisms of language learning
Language learning is a complex ability, including two different processes: understanding language and produce language, Language production involves three different processes, the voice science (perception, and the combination of word pronunciation issue), semantics (the number of words associated with a particular thing), and syntax (to determine the relationship between words.) Associated with the processes of language production using different neural channels, including the separation of the anatomical structure, physiological processes and location. When a person sees the word has a certain semantic information (such as "cat" or "house"), the left hemisphere of the brain after the lateral area will be activated, and if these words have some kind of grammatical information (such as " on the ... "or" from "), then only the left hemisphere prefrontal cortex is activated. In contrast, there is a sensitive period for grammatical information access, when a 4-year-old child to learn grammar, the lateral left hemisphere is activated, and for an adult, you need to activate the lateral left and right hemispheres. 12-year-old seems to be learning the syntax of the limits of the sensitive period, after which began to use both sides of the brain. And with age increasing, learning a language grammar for the first time when bilateral brain activity also in