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Accelerated long-term forgetting: from subjective memory decline to a defined clinical entity.

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Subjective memory decline (SMD) may indicate early Alzheimer's disease (AD). Patients with SMD exhibit accelerated long-term forgetting (ALF), suggesting it is a distinct clinical entity, not merely subjective complaints.

Keywords:
Alzheimer’s diseaseSubjective memory declineaccelerated long-term forgettingamnesiaepilepsy

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Neurology

Background:

  • Subjective memory decline (SMD) may precede Alzheimer's disease (AD) diagnosis.
  • Epileptic amnesia is linked to accelerated long-term forgetting (ALF).
  • Investigating ALF in SMD is crucial for early AD detection.

Purpose of the Study:

  • To determine if individuals with subjective memory decline (SMD) exhibit accelerated long-term forgetting (ALF).
  • To assess memory performance in SMD patients compared to controls using specific cognitive tests.
  • To explore the relationship between ALF, memory complaints, and psychological factors in SMD.

Main Methods:

  • Recruitment of subjects with subjective memory decline (SMD) and a control group.
  • Administration of the Rey Auditory Verbal Learning Test (RAVLT) for recall and recognition after a 1-week delay.
  • Utilized the Rey-Osterrieth Complex Figure Test (ROCF) for recall after a 1-week delay.
  • Statistical analysis included two-way ANOVAs and stepwise regression with the Everyday Memory Questionnaire (EMQ) and Depression Anxiety Stress Scales (DASS-21).

Main Results:

  • SMD subjects demonstrated significantly poorer performance on RAVLT recall and recognition compared to controls after a 1-week delay.
  • No significant differences were found in ROCF recall between SMD subjects and controls.
  • Accelerated long-term forgetting (ALF) in SMD was not associated with depression or subjective memory complaints.

Conclusions:

  • Subjective memory decline (SMD) patients exhibit accelerated long-term forgetting (ALF), a marker of temporomesial dysfunction.
  • ALF in SMD suggests a potential preclinical stage of neurodegenerative diseases like Alzheimer's disease (AD).
  • SMD may represent a specific clinical entity rather than subjective perception, highlighting the need for objective cognitive assessment.