This paper proposes a behavior analysis system for quantitative evaluation of infants with attention deficit hyperactivity disorder (ADHD) using video images. The system records infantsʼ movements using video cameras without any markers, and quantitatively evaluates each infantʼs behavior using features extracted from video images based on the behavior model. In the experiments performed, behaviors of infants in nursery school were evaluated using the proposed system. The results showed that the behavior of a high-risk infant significantly different from those of normal infants. These outcomes indicated that the proposed system could discriminate the behavior of normal infants and high-risk infants.

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This study aimed to investigate the changes in quiet standing posture with growth in Japanese children. Six groups of participants were included in this study: elementary school (ES) boys (n=108, 9-10 years) and girls (n=78, 9-10 years), junior high school (JH) boys (n=177, 12-13 years) and girls (n=173, 12-13 years), and high school (HS) boys (n=116, 15-16 years) and girls (n=103, 15-16 years). They maintained a quiet standing position on a flat floor, with open eyes, while taking a picture in the sagittal plane. The picture coordinates obtained for assessment were the vertices of the porus acusticus externus, acromion, greater trochanteric head, and the center of the knee joint and lateral malleolus. We calculated the length and orientation of the neck, trunk, thigh, and lower leg segments for each group, and the correlation coefficients for orientation of all segments. The length of each segment was larger than the corresponding younger group, and the corresponding values were significantly larger in boys than in girls in the JH or older. The forward tilt of the thigh segment was significantly larger in the HS group than in the ES and JH groups, and the corresponding value of the trunk segment was significantly larger in in ES group than in the JH group, in both sexes. However, it was shown that the forward tilt of neck segment was significantly larger in the JH group than in the ES and HS groups. The orientation of a given segment was correlated with that of the contiguous segment, regardless of age group. These results suggest that there are orientation changes in each segment with growth, whereas the relationship between the orientations of contiguous segments is independent of age.

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