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Transcranial Direct Current Stimulation (tDCS) for Memory Enhancement
Published on: September 18, 2021
Executive dysfunction and memory in older patients with major and minor depression
Virginia Elderkin-Thompson1, Jim Mintz, Ebrahim Haroon
1UCLA Neuropsychiatric Research Institute, Geriatric Division, Los Angeles, CA, USA. velderkin@mednet.ucla.edu
Summary
Late-life depression impairs executive function, affecting verbal learning and recall. This study shows executive dysfunction mediates memory deficits in older adults with depression.
Area of Science:
- Neuroscience
- Gerontology
- Psychiatry
Context:
- Late-life depression frequently involves cognitive impairments, particularly affecting executive function linked to frontostriatal pathways.
- Memory deficits are commonly observed in older adults with depression, necessitating investigation into underlying mechanisms.
Purpose:
- To investigate whether executive function mediates verbal learning and recall deficits in patients with late-life depression.
- To explore the role of frontostriatal compromise in executive dysfunction and its downstream effects on memory.
Summary:
- A cross-sectional study compared 95 depressed patients (minor/major) with 71 controls using neuropsychological tests, including the California Verbal Learning Test (CVLT).
- Depressed patients showed deficits in verbal learning and executive tasks. Executive function significantly mediated verbal learning scores (z = -2.67, p = .01).
- A nonverbal executive score also mediated verbal learning (z = -2.18, p = .03), supporting convergent validity of executive dysfunction in verbal learning.
Impact:
- Findings suggest that verbal memory deficits in late-life depression may stem from impaired executive functioning during the learning phase of memory tasks.
- This research highlights the critical role of executive function in memory performance among older adults with depression, informing potential therapeutic targets.
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