She had never asked any questions, and knew little grammar. Her language developed unconventionally slowly. Explosive language development of general children had never appeared on her. Four years later, she began to make up words. Most of her utterances like summary telegrams. Children’s brains haven’t developed maturely enough to accept language before two years old; but after puberty, the constitution of brain has completely accomplished without having plasticity any longer. In the four years, Genie’s right brain intelligence had promoted steadily, but visual memory, language function related with left brain haven’t promoted at all. Language acquisition may be the trigger of Lateralization’s normal model, but if language has not acquired in an appropriate time, the former normal cerebral cortex will restrain language development, and connect ability will also shrink functionally at the same time, which means childhood is a critical period for the development of left brain. If there is a failing development in critical period, the future study will be restricted in the right brain. Through the study about Genie, doctors knew that the development of grammar needs language stimuli. When children are insulated from language, they will lose the ability of saying complete sentences.
吉尼的例子主要是说明关键期假说的正确性.关键期假说是人在一定的年龄比较容易掌握语言,过来这个时期,就很难掌握.至于对今天学习语言的启发,主要是开始学习外语的年龄方面的.