Accidental MCI in healthy subjects: a prospective longitudinal study

Area of Science:

• Neuroscience
• Gerontology
• Cognitive Psychology

Background:

• Cognitive aging research often involves assessing older adults using neuropsychological tests.
• Distinguishing between temporary cognitive fluctuations and early signs of dementia is a clinical challenge.

Purpose of the Study:

• To investigate the incidence and patterns of cognitive normalization in older adults over a 12-month period.
• To identify factors associated with temporary cognitive deficits and propose methods to reduce false positive diagnoses.

Main Methods:

• A cohort of 130 healthy, autonomous volunteers aged 60-80 underwent comprehensive neuropsychological testing at baseline, 6, and 12 months.
• Participants were categorized based on cognitive performance at baseline and followed for changes in scores over one year.

Main Results:

• At baseline, 35% of participants exhibited cognitive deficits in one or more tests.
• After 12 months, 48% of those initially impaired normalized their cognitive scores.
• Impairment persistence was associated with deficits in three or more tests at baseline, while normalization occurred in those with one or two deficits.

Conclusions:

• A significant proportion of older adults experiencing temporary cognitive deficits can normalize within a year.
• Accidental cognitive impairments are possible, highlighting the need for cautious interpretation of neuropsychological test results.
• Decision rules are proposed to mitigate the risk of false positive diagnoses of very mild dementia.