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
Summary
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.
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.
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