@article{oai:hirogaku-u.repo.nii.ac.jp:00000144,
 author = {斎藤, 繁},
 issue = {2},
 journal = {弘前学院大学社会福祉学部研究紀要},
 month = {Mar},
 note = {Article, This study attempted to c1arify the development of intelligence of a child with Down' s syndrome by using longitudinal method. The chromsome nucleus type of the subject is 21-torisomy.  With increasing age，the ratio IQ on the Binet-Suzuki and the Binet-Tanaka intelligence scales dec1ined gradually (see Fig. 1). At 7 years old the IQ scoes showed 85 in borderline c1ass，and then 53 at age 18. IQ at age 23 was 56. the IQs remained relatively stable over long periodes. Studies of intelligence in children with Down' s syndrome have commonly found IQs to dec1ine with age，or less commonly，to remain relatively stable. In the present study IQ scores dec1ined gradually until 18 years. However，Fig. l shows the IQ score changes between 18 and 23 years. The score increased of 3 points. The dec1ine has been variously suggested as resulting from deterioration of cerebral
function，artifacts of test construction or content，or neuromotor and sensory disabilities emerging with age， but no definitive conclusion has been reached. The regression with aging closely related to intellectual abilities of people with Down's syndrome. It is also suggested that the remedial treatment during the early stage is more effective on their cognitive development., 弘前学院大学社会福祉学部研究紀要. 2, 2002, p.42-50},
 pages = {42--50},
 title = {ダウン症児の知能の経年的変化について},
 year = {2002}
}