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Sustained attention and inhibitory control in persons with intellectual disabilities

[Speaker] Haishi, Koichi:1
[Co-author] Ikeda, Yoshifumi:2, Oba, Shigeji:2, Okuzumi, Hideyuki:3
1:Saitama University (Japan), 2:Joetsu University of Education (Japan), 3:Tokyo Gakugei University (Japan)

This study investigated 1) the properties of sustained attention and inhibitory control in persons with intellectual disabilities (ID), and 2) the relationship between them using the continuous performance test (CPT). Participants were 22 persons with ID. A total of 40 CPT stimuli consisted of 30% rare and 70% frequent stimuli. Participants responded to one of two rare stimuli in 1/2 condition and two of three in 2/3 condition. Omission error rate, correct response reaction time and commission error rate were measured. Participants were divided into group I (IQ > 50) and II (IQ < 49). Omission error reflects lapses of attention and commission error represents inhibitory control problems. Commission error rate rose in 2/3 condition in both groups. Omission error rate of group II was significantly higher than group I in both conditions. Results suggest that the processes associated with sustained attention and inhibitory control are relatively independent.
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