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Working memory refers to a combination of components, including short-term memory and attention, that allow an individual to hold information temporarily as we perform cognitive tasks. It is an essential cognitive function that enables the execution of complex tasks such as problem-solving, comprehension, and reasoning. Unlike short-term memory, which simply involves the storage of information for a brief period, working memory involves the active manipulation and processing of this...
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The information-processing theory of cognitive development centers on fundamental mental processes, including attention, memory, and problem-solving skills. Researchers in this field examine how cognitive abilities, such as working memory, evolve and influence children's overall development. Studies indicate that children with stronger working memory tend to excel in reading comprehension, math, and problem-solving compared to peers with less efficient memory skills. Low working memory is...
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Controlled processes in human consciousness represent high-alert mental states where individuals deliberately focus their attention on achieving specific goals. Controlled processes can be seen in situations like mastering new technology, where a person might become so absorbed that they ignore surrounding distractions. Such processes involve selective attention, requiring one to concentrate on particular elements of experience while disregarding others. These are governed by executive...
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Related Experiment Video

Updated: Oct 30, 2025

Assessing Working Memory in Children: The Comprehensive Assessment Battery for Children – Working Memory (CABC-WM)
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Neural basis of working memory in ADHD: Load versus complexity.

Prerona Mukherjee1, Tadeus Hartanto1, Ana-Maria Iosif2

  • 1Department of Psychiatry and Behavioral Sciences and MIND Institute, University of California, Davis, 2825 50th St., Sacramento, CA 95817, USA.

Neuroimage. Clinical
|July 3, 2021
PubMed
Summary
This summary is machine-generated.

Working memory (WM) capacity in attention deficit hyperactivity disorder (ADHD) is impacted by both information load and task complexity. ADHD individuals showed reduced brain activation in key areas during demanding WM tasks compared to neurotypical peers.

Keywords:
ADHDCaudateCerebellumFunctional imagingPrefrontal cortexWorking memory capacityfMRI

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Psychiatry

Background:

  • Working memory (WM) deficits are a hallmark of attention deficit hyperactivity disorder (ADHD), but their nature remains debated.
  • Previous research has implicated various brain regions, including the prefrontal cortex, cerebellum, and caudate, yet findings are inconsistent.
  • Conceptualizations of WM capacity, focusing on information load versus operational complexity, may explain these discrepancies.

Purpose of the Study:

  • To investigate the distinct impacts of WM load and operational complexity on behavioral performance and neural activation in adolescents and young adults with and without ADHD.
  • To determine if WM impairments in ADHD are more pronounced under higher loads or more complex operations.

Main Methods:

  • Functional magnetic resonance imaging (fMRI) was used to scan 50 individuals with ADHD and 82 neurotypical (NT) individuals (aged 12-23).
  • Participants performed a WM task requiring recall of objects in either forward (simpler) or backward (complex) order, with varying information loads.
  • Behavioral performance and brain activation patterns were analyzed, comparing effects of diagnosis, load, and complexity.

Main Results:

  • Behaviorally, significant interactions revealed that both diagnosis and task parameters influenced WM performance.
  • Neurally, interactions between diagnosis and load were observed in the right striatum, and between diagnosis and complexity in the right cerebellum and left occipital gyrus.
  • The ADHD group exhibited hypo-activation in these regions compared to the NT group, particularly under higher WM loads and greater operational complexity.

Conclusions:

  • WM deficits in ADHD are modulated by both the amount of information (load) and the nature of the operation (complexity).
  • Neural underpinnings of WM impairments in ADHD involve altered activation in the striatum, cerebellum, and occipital cortex.
  • Findings provide insights into functional challenges in ADHD, such as academic difficulties, and suggest targeted WM training interventions.