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Heterogeneity in ADHD: Neuropsychological Pathways, Comorbidity and Symptom Domains
Uppsala universitet, Humanistisk-samhällsvetenskapliga vetenskapsområdet, Samhällsvetenskapliga fakulteten, Institutionen för psykologi.
Uppsala universitet, Humanistisk-samhällsvetenskapliga vetenskapsområdet, Samhällsvetenskapliga fakulteten, Institutionen för psykologi.
Uppsala universitet, Humanistisk-samhällsvetenskapliga vetenskapsområdet, Samhällsvetenskapliga fakulteten, Institutionen för psykologi.
2009 (Engelska)Ingår i: Journal of Abnormal Child Psychology, ISSN 0091-0627, E-ISSN 1573-2835, Vol. 37, nr 4, s. 551-564Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

The aim of the present study was to investigate different neuropsychological impairments and comorbid behavioral problems in relation to symptoms of Attention-Deficit/Hyperactivity Disorder (ADHD), studying the independent effects of different functions as well as specific relations to symptoms of hyperactivity/impulsivity and inattention. A community-based sample of school children (n∈=∈182; the higher end of the ADHD symptom range was oversampled) completed neuropsychological tasks designed to measure executive function (EF), state regulation and delay aversion. Behavioral symptoms were measured through parental and teacher ratings of the DSM-IV criteria for ADHD and Oppositional Defiant Disorder (ODD). Both categorical and dimensional analyses were used to acquire a deeper understanding of ADHD. The results supported the notion that EF and state regulation constitute independent pathways to ADHD, primarily to symptoms of inattention. In addition, the present study points to the importance of viewing ADHD as a heterogeneous condition also with regard to the differential impact of neuropsychological functioning and comorbidity on different ADHD symptom groups and the two ADHD symptom domains.

Ort, förlag, år, upplaga, sidor
2009. Vol. 37, nr 4, s. 551-564
Nyckelord [en]
ADHD, Comorbidity, Heterogeneity, Hyperactivity, Inattention, Neuropsychological factors
Nationell ämneskategori
Medicin och hälsovetenskap
Identifikatorer
URN: urn:nbn:se:uu:diva-97906DOI: 10.1007/s10802-008-9286-9ISI: 000264879800008PubMedID: 19016322OAI: oai:DiVA.org:uu-97906DiVA, id: diva2:173018
Tillgänglig från: 2008-12-11 Skapad: 2008-12-11 Senast uppdaterad: 2017-12-14Bibliografiskt granskad
Ingår i avhandling
1. Specifying the Heterogeneity in Children with ADHD: Symptom Domains, Neuropsychological Processes, and Comorbidity
Öppna denna publikation i ny flik eller fönster >>Specifying the Heterogeneity in Children with ADHD: Symptom Domains, Neuropsychological Processes, and Comorbidity
2009 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

Heterogeneity in children with Attention Deficit Hyperactivity Disorder (ADHD) symptoms is a well-known phenomenon. Empirically, this heterogeneity is evident in at least three different respects: expression of the two ADHD symptom domains (hyperactivity/impulsivity and inattention), neuropsychological impairments, and comorbid behavior problems. The major aim of the present thesis was to examine the heterogeneity characterizing children with ADHD symptoms to enhance our understanding by examining neuropsychological factors with regard to common and independent contributions, and specificity of the two ADHD symptom domains in relation to neuropsychological factors and comorbid behavioral problems. Particular emphasis is placed on prominent neuropsychological processes such as executive functions, state regulation and delay aversion. The present thesis is based on findings from four studies on community-based samples of children – studies involving concurrent and longitudinal designs as well as both categorical and dimensional approaches.

Results provide support for the notion that executive function and state regulation, but not delay aversion, constitute independent pathways to ADHD, primarily to symptoms of inattention. However, delay aversion was shown to have an effect in combination with state regulation on both hyperactivity/impulsivity and inattention. Additionally, symptoms of hyperactivity/impulsivity and inattention have different primary correlates concerning neuropsychological factors and comorbidity. More specifically, executive function, state regulation, internalizing problems and academic achievement were specifically related to inattention but not to hyperactivity/impulsivity. Oppositional Defiant Disorder (ODD) was specifically related to hyperactivity/impulsivity, but not to inattention.

The present thesis has contributed with important and new knowledge about the heterogeneity of children with ADHD symptoms concerning neuropsychological pathways, and specificity of the two ADHD symptom domains in relation to neuropsychological factors and comorbid behavioral problems. Knowledge such as this can help us understand how to identify more homogeneous ADHD subgroups, and contribute to the further development of multiple pathway models within this area of research.

Ort, förlag, år, upplaga, sidor
Uppsala: Acta Universitatis Upsaliensis, 2009. s. 101
Serie
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Social Sciences, ISSN 1652-9030 ; 47
Nyckelord
ADHD, Heterogeneity, Hyperactivity/Impulsivity, Inattention, Neuropsychological Pathways, Comorbidity
Forskningsämne
Psykologi
Identifikatorer
urn:nbn:se:uu:diva-9485 (URN)978-91-554-7370-9 (ISBN)
Disputation
2009-01-16, Sal IX, Universitetshuset, Uppsala, 13:15
Opponent
Handledare
Tillgänglig från: 2008-12-11 Skapad: 2008-12-11 Senast uppdaterad: 2015-03-20Bibliografiskt granskad

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