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Individuals with subjective cognitive decline experience subtle objective cognitive impairments in verbal learning and executive function. These deficits may be missed by standard cognitive tests, suggesting a need for refined diagnostic criteria.

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Gerontology

Background:

  • Subjective cognitive decline (SCD) is considered the earliest clinical stage of neurodegeneration.
  • Current definitions imply no measurable cognitive impairment, yet objective deficits are reported.
  • This study aimed to identify objective cognitive performance differences in SCD patients versus healthy controls.

Purpose of the Study:

  • To evaluate objective cognitive performance differences between individuals with subjective cognitive decline and cognitively unimpaired healthy controls.
  • To investigate subtle cognitive impairments in SCD that may not be detected by brief screening tools.
  • To inform potential revisions of SCD diagnostic criteria for improved precision.

Main Methods:

  • 101 cognitively unimpaired participants were categorized into SCD (n=67) and healthy control (n=34) groups.
  • Comprehensive cognitive evaluations were performed, alongside collection of social, demographic, clinical, personality, sleep, and physical activity data.
  • Groups were matched for sex, age, education, and Mini-Mental State Examination (MMSE) scores.

Main Results:

  • The SCD group demonstrated significantly lower verbal learning capacity, evidenced by poorer performance on Rey Auditory Verbal Learning Test (RAVLT) trial 1 (P=.021) and total scores (P=.023).
  • Executive functioning was significantly impaired in the SCD group compared to controls, as indicated by Trail Making Test A performance (P=.012).
  • These objective impairments were subtle and not sufficient for a diagnosis of mild cognitive impairment.

Conclusions:

  • Individuals with subjective cognitive decline exhibit subtle, objective cognitive impairments.
  • These deficits, particularly in verbal learning and executive function, may be missed by brief cognitive assessments like the MMSE.
  • Expanding current SCD criteria could enhance diagnostic accuracy and clinical utility.