Comparative Analysis of the WISC between Two ADHD Subgroups
Open accessAbstract
OBJECTIVE: The prevalence of attention deficit/hyperactivity disorder (ADHD) in school-age children is 7.2%, and ADHD is divided into clinical subtypes. METHODS: The current study explored whether specific cognitive profiles as assessed using the Wechsler Intelligence Scale for Children (WISC)-IV could be obtained for each clinical ADHD subtype (ADHD-Inattentive type and ADHD-Combined type) and investigated the correlation between WISC scores and parental age at their children's birth or birthweight. The enrolled sample comprised 12 ADHD-I and 15 ADHD-C subjects. RESULTS: An impaired Processing Speed Index was found in ADHD-I. The age of the father at the child's birth and birthweight positively correlated with the full scale intelligence quotient (FSIQ) score in the WISC assessment. CONCLUSION: Inattentiveness within the behaviors of the children with ADHD-I is partly due to the impaired processing speed, therefore effective support for ADHD will be conducted if educator decreases their speaking speed. Since biological basis of ADHD is still largely unknown, future studies using both psychological and biological methods will reveal the etiology of ADHD. These scientific assessments will provide information for more effective approaches in the care of children with ADHD.
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Findings consistently show lower performance on the working memory index (WMI) and processing speed index (PSI) in ADHD.
“Findings consistently show lower performance on the working memory index (WMI), which reflects the ability to actively manipulate information, and on the processing speed index (PSI), associated with the speed and automatization of cognitive processes [24, 25, 26].”
From ADHD, Subtypes and Cognitive Performance: WISC-V as a Support Tool for Diagnostic Assessment (2026) · cites this paper as [24]
The Results and Discussion report lower PSI scores in children with ADHD-I than in children with ADHD-C, and the Discussion describes PSI as the speed of simple or automatic cognitive tasks. The paper does not establish consistently lower WMI and PSI performance across ADHD generally; its reported comparison is between two ADHD subgroups, and it reports no corresponding WMI difference. (LLM, conf=0.87)
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“Findings consistently show lower performance on the working memory index (WMI), which reflects the ability to actively manipulate information, and on the processing speed index (PSI), associated with the speed and automatization of cognitive processes [24–26].”
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- Authors
- Kubo, Y., Kanazawa, T., Kawabata, Y., Tanaka, K., Okayama, T., Fujta, M., Tsutsumi, A., Yokota, S., & Yoneda, H.
- Affiliations
- The University of Melbourne (AU)
- Corresponding author
- Kanazawa, Tetsufumi
- Venue
- Psychiatry Investigation
- Publisher
- Korean Neuropsychiatric Association
- Published
- 2018-02-25
- Volume
- 15
- Issue
- 2
- Pages
- 172-177
- ISSN
- 1738-3684 (ISSN-L)
- 1976-3026
- PMC
- PMC5900405
- OpenAlex
- W2789897454
- Cited by
- 11
- References
- 34
- Citations by year
- 2025: 1 · 2024: 2 · 2022: 2 · 2021: 3 · 2020: 3
- FWCI
- 1.18
- Type
- journal article
- Language
- en
- Open access
- diamond
- doi.org
- Licence
- Locations
- Psychiatry Investigation (publishedVersion, cc-by-nc)
- Europe PMC (PubMed Central) (publishedVersion, cc-by-nc)
- PubMed Central (publishedVersion, cc-by-nc)
- PubMed (publishedVersion)
- Funders
- Japan Society for the Promotion of Science (16K10196)
- Topics
- Health Sciences › Medicine › Psychiatry and Mental health › Attention Deficit Hyperactivity Disorder
- Social Sciences › Psychology › Neuropsychology and Physiological Psychology › Developmental and Educational Neuropsychology
- Social Sciences › Psychology › Experimental and Cognitive Psychology › Cognitive Abilities and Testing
- Keywords
- attention deficit hyperactivity disorder, ADHD subtypes, ADHD inattentive type, combined type ADHD, Wechsler Intelligence Scale for Children, processing speed, cognitive profile, birth weight, full-scale intelligence quotient, elementary school students
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