Abstract
The purpose of this study is to analyze children's brain activity during calculating. We examined concentration changes of hemoglobin in prefrontal cortex and performance time during performance of addition mushikuizan task-calculation of filling in the missing numbers-in fifth-grade children. It was found from the result that features of concentration changes of hemoglobin are different depending on performance time (difficulty) of the subject. Compared to case of university students, this result has a feature of great difference between individuals. Therefore it is important to examine result of children in considering education.
