Emotional valence and semantic relatedness differentially influence false recognition in mild cognitive impairment,...

Area of Science:

• Neuroscience
• Cognitive Psychology
• Gerontology

Background:

• Mild cognitive impairment (MCI) is a transitional stage between normal aging and Alzheimer disease (AD).
• Understanding memory deficits in MCI is crucial for early diagnosis and intervention.
• Emotional memory processing may be an early indicator of neurodegenerative changes.

Purpose of the Study:

• To investigate whether patients with MCI exhibit memory deficits comparable to those with diagnosed AD.
• To examine emotional memory processing, specifically false memories, in MCI and AD patients.
• To identify potential early biomarkers of AD progression within emotional memory paradigms.

Main Methods:

• Utilized an emotional variant of the Deese-Roediger-McDermott paradigm.
• Assessed 27 MCI patients, 36 AD patients, and 20 healthy older adults.
• Presented word lists semantically related to theme words of varying valence (positive, neutral, negative).

Main Results:

• MCI patients produced a similar number of false memories as AD patients.
• Both MCI and AD groups showed enhanced false memories for unrelated stimuli.
• A significant bias towards falsely remembering positively valenced stimuli was observed in both patient groups.

Conclusions:

• While overall emotional recognition may not differentiate MCI from healthy aging, false positive memories could be an early sign.
• Positively valenced false memories may represent a specific breakdown in emotional memory processing along the continuum to AD.
• This suggests that subtle alterations in emotional memory, particularly false memories, are indicative of early neurodegenerative processes.