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Systematic Review: Attention-Deficit/Hyperactivity Disorder and Instrumental Learning

Hulsbosch AK 1 , De Meyer H 2 , Beckers T 3 , Danckaerts M 4 , Van Liefferinge D 5 , Tripp G 6 Show all authors , Van der Oord S 7 , Profs. Tripp and Van der Oord share co-last authorship of this work.

Affiliations 

  • 1 Mrs. Hulsbosch, Dr. De Meyer, and Prof. Drs. Beckers, Danckaerts, and Van der Oord are with KU Leuven, Belgium. Electronic address: An-katrien.hulsbosch@kuleuven.be
  • 2 Mrs. Hulsbosch, Dr. De Meyer, and Prof. Drs. Beckers, Danckaerts, and Van der Oord are with KU Leuven, Belgium; Dr. De Meyer is also with the HELP University, Kuala Lumpur, Malaysia
  • 3 Mrs. Hulsbosch, Dr. De Meyer, and Prof. Drs. Beckers, Danckaerts, and Van der Oord are with KU Leuven, Belgium
  • 4 Mrs. Hulsbosch, Dr. De Meyer, and Prof. Drs. Beckers, Danckaerts, and Van der Oord are with KU Leuven, Belgium; Dr. Van Liefferinge and Prof. Dr. Danckaerts also are with the University Psychiatric Centre KU Leuven, Belgium
  • 5 Dr. Van Liefferinge and Prof. Dr. Danckaerts also are with the University Psychiatric Centre KU Leuven, Belgium
  • 6 Prof. Dr. Tripp is with the Okinawa Institute of Science and Technology (OIST) Graduate University, Japan
  • 7 Mrs. Hulsbosch, Dr. De Meyer, and Prof. Drs. Beckers, Danckaerts, and Van der Oord are with KU Leuven, Belgium; Prof. Dr. Van der Oord is with the University of Amsterdam, the Netherlands
J Am Acad Child Adolesc Psychiatry, 2021 Nov;60(11):1367-1381.
PMID: 33862167 DOI: 10.1016/j.jaac.2021.03.009

Abstract

OBJECTIVE: Although instrumental learning deficits are, among other deficits, assumed to contribute to attention-deficit/hyperactivity disorder (ADHD), no comprehensive systematic review of instrumental learning deficits in ADHD exists. This review examines differences between ADHD and typically developing (TD) children in basic instrumental learning and the effects of reinforcement form, magnitude, schedule, and complexity, as well as effects of medication, on instrumental learning in children with ADHD.

METHOD: A systematic search of PubMed, PsyINFO, CINAHL, EMBASE+EMBASE CLASSIC, ERIC, and Web of Science was conducted for articles up to March 16, 2020. Experimental studies comparing instrumental learning between groups (ADHD versus TD) or a manipulation of reinforcement/medication within an ADHD sample were included. Quality of studies was assessed with an adapted version of the Hombrados and Waddington criteria to assess risk of bias in (quasi-) experimental studies.

RESULTS: A total of 19 studies from among 3,384 non-duplicate screened articles were included. No difference in basic instrumental learning was found between children with ADHD and TD children, nor effects of form or magnitude of reinforcement. Results regarding reinforcement schedule and reversal learning were mixed, but children with ADHD seemed to show deficits in conditional discrimination learning compared to TD children. Methylphenidate improved instrumental learning in children with ADHD. Quality assessment showed poor quality of studies with respect to sample sizes and outcome and missing data reporting.

CONCLUSION: The review identified very few and highly heterogenous studies, with inconsistent findings. No clear deficit was found in instrumental learning under laboratory conditions. Children with ADHD do show deficits in complex forms of learning, that is, conditional discrimination learning. Clearly more research is needed, using more similar task designs and manipulations.

* Title and MeSH Headings from MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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