Executive dysfunction and memory in older patients with major and minor depression

Arch Clin Neuropsychol. 2007 Feb;22(2):261-70. doi: 10.1016/j.acn.2007.01.021.

Abstract

Executive function, known to be impaired during late-life depression, is dependent on frontostriatal pathways. Memory is also frequently observed to be impaired among late-life depressed patients, so we assessed the possibility that executive function mediates the learning and recall deficit as a "downstream" effect of the frontostriatal compromise in executive function. A cross-sectional sample of minor and major depressed patients (N = 95) and nondepressed volunteers (N = 71), screened for other Axis I disorders, dementia, medical comorbidity and severity of depression, completed a neuropsychological battery that included the California Verbal Learning Test (CVLT) and other tests selected for convergent and divergent validity testing. Depressed patients differed from controls on learning the word list and on related and unrelated executive tasks. Executive function was a mediator for depressed patients verbal learning scores (z = -2.67, p = .01). A nonverbal executive score also mediated verbal learning (z = -2.18, p = .03) indicating convergent validity of executive dysfunction during verbal learning exercises. In conclusion, the verbal memory deficits typically attributed to late-life depression may result from impaired executive functioning during the learning phase of the recall task.

Publication types

  • Corrected and Republished Article
  • Research Support, N.I.H., Extramural

MeSH terms

  • Aged
  • Aged, 80 and over
  • Cognition Disorders / diagnosis*
  • Cognition Disorders / psychology
  • Depressive Disorder / diagnosis*
  • Depressive Disorder / psychology
  • Depressive Disorder, Major / diagnosis*
  • Depressive Disorder, Major / psychology
  • Female
  • Humans
  • Male
  • Memory Disorders / diagnosis*
  • Memory Disorders / psychology
  • Mental Recall
  • Mental Status Schedule / statistics & numerical data
  • Middle Aged
  • Problem Solving*
  • Psychometrics / statistics & numerical data
  • Reproducibility of Results
  • Verbal Learning