Volume 48, Issue 9 p. 890-898

Heart rate and reinforcement sensitivity in ADHD

Marjolein Luman

Marjolein Luman

Department of Clinical Neuropsychology, Vrije Universiteit Amsterdam, The Netherlands

Department of Neuropsychology, PI Research, Duivendrecht, The Netherlands

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Jaap Oosterlaan

Jaap Oosterlaan

Department of Clinical Neuropsychology, Vrije Universiteit Amsterdam, The Netherlands

Department of Neuropsychology, PI Research, Duivendrecht, The Netherlands

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Christopher Hyde

Christopher Hyde

BioAssessments, Elkton, USA

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Catharina S. Van Meel

Catharina S. Van Meel

Department of Developmental Psychology, Universiteit Leiden, The Netherlands

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Joseph A. Sergeant

Joseph A. Sergeant

Department of Clinical Neuropsychology, Vrije Universiteit Amsterdam, The Netherlands

Department of Neuropsychology, PI Research, Duivendrecht, The Netherlands

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First published: 09 August 2007
Citations: 37
Marjolein Luman, Department of Clinical Neuropsychology, Vrije Universiteit Amsterdam, Van der Boechorststraat 1, 1081 BT Amsterdam, The Netherlands; Tel: +31 (0)20 59 89255; Fax: +31 (0)20 59 88971; Email: [email protected]

Conflict of interest statement: No conflicts declared.

Abstract

Background: Both theoretical and clinical accounts of attention-deficit/hyperactivity disorder (ADHD) implicate a dysfunctional reinforcement system. This study investigated heart rate parameters in response to feedback associated with reward and response cost in ADHD children and controls aged 8 to 12.

Methods: Heart rate responses (HRRs) following feedback and heart rate variability (HRV) in the low frequency band (.04–.08 Hz), a measure of mental effort, were calculated during a time production paradigm. Performance was coupled to monetary gain, loss or feedback-only in a cross-over design.

Results: Children with ADHD exhibited smaller HRRs to feedback compared to controls. HRV of children with ADHD decreased when performance was coupled to reward or response cost compared to feedback-only. HRV of controls was similar across conditions.

Conclusions: Children with ADHD were characterised by (a) possible abnormalities in feedback monitoring and (b) motivational deficits, when no external reinforcement is present.