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Basic and complex cognitive functions in Adult ADHD.

Saleh M H Mohamed1, Marah Butzbach1, Anselm B M Fuermaier1

  • 1Department of Clinical and Developmental Neuropsychology, University of Groningen, Groningen, Netherlands.

Plos One
|September 2, 2021
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Summary
This summary is machine-generated.

Basic cognitive functions like processing speed significantly impact complex cognitive deficits in adults with Attention-Deficit/Hyperactivity Disorder (ADHD). These fundamental abilities explain a substantial portion of executive dysfunction in ADHD patients.

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Psychiatry

Background:

  • Adults with Attention-Deficit/Hyperactivity Disorder (ADHD) exhibit deficits in both basic and complex cognitive functions.
  • The contribution of basic cognitive functions (processing speed, distractibility) to complex cognitive impairments in ADHD is not well-understood.
  • Previous research indicated basic functions explain 27-74% of executive dysfunction, but test selection may have influenced results.

Purpose of the Study:

  • To investigate the extent to which basic cognitive functions contribute to complex cognitive impairments in adults with ADHD.
  • To replicate previous findings using a different sample and a distinct set of neuropsychological tests.

Main Methods:

  • Forty-eight adults with ADHD and 48 healthy controls were assessed.
  • Evaluated basic cognitive functions (processing speed, distractibility) and complex functions (selective attention, cognitive flexibility, planning, working memory, verbal fluency, verbal memory).
  • Utilized tests including Vigilance and Sustained Attention, Selective Attention, N-Back, Tower of London, Trail Making Test, Word Fluency, and Verbal Learning and Memory.

Main Results:

  • Complex cognitive impairments explained 25% of the variance in ADHD diagnosis.
  • After accounting for basic functions (processing speed, distractibility), the explained variance dropped to 9%.
  • This represents a 64% reduction, underscoring the role of basic functions in complex cognitive deficits.

Conclusions:

  • Basic cognitive functions, specifically processing speed and distractibility, are crucial for understanding complex cognitive impairments in adults with ADHD.
  • Deficits in fundamental cognitive processes significantly underlie executive dysfunctions observed in ADHD.