Cited by 44Attention Deficit Hyperactivity DisorderDevelopmental and Educational NeuropsychologyNeural and Behavioral Psychology Studies

Working Memory and Information Processing in ADHD: Evidence for Directionality of Effects

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Kofler, Michael J., Soto, Elia F., Fosco, Whitney D., Irwin, Lauren N., Wells, Erica L., Sarver, Dustin E.·2020·Neuropsychology

Abstract

OBJECTIVE: Children with ADHD demonstrate impaired performance on a wide range of neuropsychological tests. It is unclear, however, whether ADHD is associated with many neurocognitive deficits or whether a small number of impairment(s) broadly influence test performance. The current study tests competing model predictions regarding two candidate causal mechanisms in ADHD: information processing speed and working memory. METHOD: = 41) completed eight fully crossed experimental tasks that systematically manipulated working memory (BF₁₀ = 1.80 × 10⁹³) and information processing speed (drift rate; BF₁₀ = 7.61 × 10⁶). RESULTS: Bayesian mixed-model ANOVAs indicated that increasing working memory demands produced significant reductions in information processing speed (drift rate; BF₁₀ = 5.82 × 10⁹⁶). In contrast, experimentally reducing children's information processing speed did not significantly change their working memory performance (BF₁₀ = 1.31). ADHD status interacted with the working memory manipulation, such that the ADHD and non-ADHD groups showed equivalently high accuracy under the encoding-only conditions (BF₀₁ = 3.45) but differed significantly under high working memory conditions (encoding + recall; BF₁₀ = 19.58). Importantly, however, ADHD status failed to interact with (a) the working memory manipulation to differentially affect information processing speed and (b) the information processing speed manipulation to differentially affect working memory performance (all BF₀₁ > 4.25). CONCLUSIONS: These findings indicate that top-down executive control exerts significant effects on children's ability to quickly process information, but that working memory deficits and slowed information processing speed appear to be relatively independent impairments in ADHD. (PsycINFO Database Record (c) 2020 APA, all rights reserved).

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  • Environmental demands that challenge working memory interact with a preexisting neurobiological vulnerability (e.g., underdeveloped cortical structures that support working memory) to produce secondary impairments including goal maintenance failures, reduced information processing efficiency, and reduced attentional filtering, which in turn result in failure to inhibit when needed and more general

    “In this view, environmental demands that challenge working memory (in this case by adding a concurrent memory load) interact with a preexisting neurobiological vulnerability (e.g., underdeveloped cortical structures that support working memory; 44) to produce secondary impairments including goal maintenance failures (61), reduced information processing efficiency (85), and reduced attentional”

    From Working memory and inhibitory control deficits in children with ADHD: an experimental evaluation of competing model predictions (2024) · cites this paper as [85]

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  • Working memory appears to affect response speeds more similarly for children with ADHD and/or anxiety.

    “In contrast, working memory appears to affect response speeds more similarly for children with ADHD and/or anxiety, which is broadly consistent with prior experimental and RCT findings (55, 85, 115).”

    From Working memory and inhibitory control deficits in children with ADHD: an experimental evaluation of competing model predictions (2024) · cites this paper as [85]

    The Results report that increasing working-memory demands reduced information-processing speed (measured as drift rate), without a differential effect between children with and without ADHD. The study does not establish the same pattern for children with anxiety, and its measured outcome is not response speed itself. (LLM, conf=0.85)

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  • The current findings are consistent with evidence from the cognitive literature and prior ADHD experimental work implicating working memory capacity as a core, underlying mechanism that broadly affects performance across a variety of neurocognitive tasks.

    “Overall, the current findings are consistent with evidence from the cognitive literature and prior ADHD experimental work implicating working memory capacity as a core, underlying mechanism that broadly affects performance across a variety of neurocognitive tasks (e.g., 85, 115).”

    From Working memory and inhibitory control deficits in children with ADHD: an experimental evaluation of competing model predictions (2024) · cites this paper as [85]

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  • The comparison between clinical and control groups revealed clear differences in cognitive indices linked to executive functioning, consistent with previous research.

    “First, the comparison between the clinical and control groups revealed clear differences in cognitive indices linked to executive functioning, consistent with previous research [35, 44, 45, 46].”
  • It remains unclear whether the pattern of difficulties reflects multiple, distinct impairments or may be more parsimoniously accounted for by a single deficit that broadly affects performance.

    “However, it remains unclear whether this pattern reflects multiple, distinct impairments or may be more parsimoniously accounted for by a single deficit that broadly affects performance (85, 86).”

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Research works printed but not linked: 2

  1. Sonuga-Barke EJS, Sergeant JA, Nigg J, & Willcutt E. (2008). Executive dysfunction and delay aversion in ADHD: Nosologic and diagnostic implications. Child & Adolescent Psychiatry Clinics, 17, 367– 384. 18295151
  2. Wagenmakers EJ, Marsman M, Jamil T, Ly A, Verhagen AJ, Love J, & Morey RD (2016). Bayesian statistical inference for psychological science. Psychonomic Bulletin & Review, 25, 169– 176.

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Authors
Kofler, M. J., Soto, E. F., Fosco, W. D., Irwin, L. N., Wells, E. L., & Sarver, D. E.
Venue
Neuropsychology
Published
2020-02
Volume
34
Issue
2
Pages
127-143
ISSN
  • 0894-4105 (ISSN-L)
  • 1931-1559
OpenAlex
W2980410200
Cited by
42
References
39
Citations by year
2026: 7 · 2025: 8 · 2024: 8 · 2023: 8 · 2022: 9 · 2021: 2
FWCI
2.19
Type
journal article
Language
en
Open access
Locations
  • Neuropsychology (publishedVersion, other-oa)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
Funders
National Institutes of Health (R34 MH102499-01)
Topics
  • Health Sciences › Medicine › Psychiatry and Mental health › Attention Deficit Hyperactivity Disorder
  • Social Sciences › Psychology › Neuropsychology and Physiological Psychology › Developmental and Educational Neuropsychology
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Neural and Behavioral Psychology Studies
Keywords
attention deficit hyperactivity disorder, working memory, processing speed, drift rate, executive function, children, causal mechanisms, neuropsychological deficits
MeSH terms
Adolescent, Attention Deficit Disorder with Hyperactivity, Bayes Theorem, Child, Cognition, Female, Humans, Male, Memory Disorders, Memory, Short-Term, Neuropsychological Tests, Reaction Time, Mental Recall, Executive Function

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