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ERIC Number: EJ1007907
Record Type: Journal
Publication Date: 2013-Mar
Pages: 8
Abstractor: As Provided
Reference Count: 0
ISSN: ISSN-0891-4222
Age-Related Change of the Mean Level and Intraindividual Variability of Saccadic Reaction Time Performance in Persons with Intellectual Disabilities
Haishi, Koichi; Okuzumi, Hideyuki; Kokubun, Mitsuru
Research in Developmental Disabilities: A Multidisciplinary Journal, v34 n3 p968-975 Mar 2013
The current study examined age-related change of saccadic reaction time (SRT) in persons with intellectual disabilities (ID). Participants were 29 persons with intellectual disabilities aged between 14 and 34 years whose IQs were between 14 and 70. Participants were divided into Group I (IQ greater than or equal to 35) and Group II (IQ less than or equal to 34). The mean and the standard deviation of SRT (SRTM and SRTSD, respectively) reduced through adolescence in both groups. This result suggests that the speed and stability of information processing develops during adolescence irrespective of the level of ID. Although SRTM and SRTSD of Group I stabilized after adolescence, those of Group II increased after their thirties. This outcome indicates that persons with severe ID may show signs of the aging process. The results of multiple regression analyses and path analyses indicated that SRTM was influenced by both the speed of information processing and the variability of the response. However, given that the extent of increase of SRTSD in Group II was smaller as compared with that of SRTM, this increase of SRTM after the thirties in Group II appears to be mainly affected by the slowness of information processing. (Contains 1 table and 3 figures.)
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Publication Type: Journal Articles; Reports - Research
Education Level: N/A
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A