It is a characteristic that many intellectually gifted children share. Perhaps not to the extent that our son's attention changes but changing more frequently than their age-mates. There is a biological basis for intellectual giftedness. There are neurological reasons why children think and act the way they do. These reasons are, at their lowest levels, the result of chemical processes in the brain and are dependent upon both previous development and current neurochemical processes.
Human beings develop and grow in a fairly predictable way that is controlled by our heredity.
Intellectually gifted children tend to progress through the normal childhood developmental stages ahead of their age-mates. Adverse life experiences, however, can reduce or even retard their rate of development. Intellectually gifted children who are given a rich environment will grow and develop at a faster pace than children who are not given the same environmental advantages. Thus, these children progress through the normal developmental stages of children slightly or even markedly ahead of their age-mates, even those who are similarly gifted intellectually. It's like a bag filled with sand.