We examine mechanisms underlying the neural development and neuronal network maturation as well as set out to give suggestions for child-rearing with considering the developmental differences of each brain activity. Details of our project are as follows. 　　　　（１） Developing a microscope with an ultra short-pulsed laser, which allows us to examine deep structure of the organs, especially the brain, using our original laser seeds. (To see details, please click here and to see the members of this research, please click here.) 　　　　（２） Elucidating the mechanisms of "pruning", "myelination" and "spinogenesis", which are essential for neuronal network formation and maturation. (To see details, please click here and to see the members of this research, please click here.) 　　　　（３） Elucidating relationships among "myelination", "oxygen metabolism" and "neural network formations" from the point of view of the brain development. 　　　　（４） Trying to develop new PET probes for imaging neuronal transmission to elucidate the brain development and developmental disorders. (To see details, please click here and to see the members of this research, please click here.) 　　　　（５） Setting out to feed back scientific knowledge from this project to fields like medical care(/nursing) , special support education, child care and child-raising support. (To see details, please click here and to see the members of this research, please click here.)