Cognitive Assessment Techniques in Dementia and Mild Cognitive Impairment

Cognitive assessment underpins the diagnosis, staging and monitoring of dementia and mild cognitive impairment (MCI). Traditional tools such as the Mini-Mental State Examination (MMSE), Montreal Cognitive Assessment (MoCA), Alzheimer’s Disease Assessment Scale–Cognitive Subscale (ADAS-Cog) and Clinical Dementia Rating (CDR) scale offer standardised tasks spanning memory, executive function, language and visuospatial processing. Composite scores and predefined thresholds for minimal clinically important differences enable clinicians to distinguish normal ageing from pathological decline and to evaluate treatment effects. In recent years, digital adaptations and automated scoring systems have emerged, augmenting sensitivity to subtle changes and reducing examiner bias. Advances in machine learning applied to hand-drawn figures, touchscreen batteries and online calculators now complement classical pen-and-paper methods, improving accessibility and facilitating remote or large-scale screening. Together, these innovations support earlier detection, more precise tracking and more equitable assessments across diverse populations.

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Cognitive Assessment Techniques in Dementia and Mild Cognitive Impairment publication trend

The graph below shows the total number of articles in cognitive assessment techniques in dementia and mild cognitive impairment across all publications each year (not limited to Nature Index journals).

Technical terms

Mild cognitive impairment (MCI): A clinical state of measurable cognitive decline greater than expected for age and education, without interference in daily living activities.

Dementia: A syndrome characterised by progressive impairment in multiple cognitive domains that interferes with independence and daily functioning.

Mini-Mental State Examination (MMSE): A 30-point questionnaire assessing orientation, recall, attention, language and visuospatial skills for cognitive screening.

Montreal Cognitive Assessment (MoCA): A 30-point test designed to detect MCI by challenging executive function, attention, memory, language and abstraction.

Alzheimer’s Disease Assessment Scale–Cognitive Subscale (ADAS-Cog): A composite score of memory, language and praxis tasks widely used as a primary cognitive endpoint in clinical trials.

Clinical Dementia Rating (CDR) scale: A structured interview yielding a global score and sum-of-boxes that grade dementia severity based on functional performance and cognitive symptoms.

References

1. Explainable deep learning approach for extracting cognitive features from hand-drawn images of intersecting pentagons. npj Digital Medicine (2023).
2. Minimal clinically important difference in Alzheimer's disease: Rapid review. Alzheimer's & Dementia (2024).
3. Relationship between the Montreal Cognitive Assessment and Mini-mental State Examination for assessment of mild cognitive impairment in older adults. BMC Geriatrics (2015).