Predictors of the discrepancy between objective and subjective cognition in bipolar disorder: a novel methodology

Acta Psychiatr Scand. 2016 Dec;134(6):511-521. doi: 10.1111/acps.12649. Epub 2016 Sep 20.

Abstract

Objective: The poor relationship between subjective and objective cognitive impairment in bipolar disorder (BD) is well-established. However, beyond simple correlation, this has not been explored further using a methodology that quantifies the degree and direction of the discrepancy. This study aimed to develop such a methodology to explore clinical characteristics predictive of subjective-objective discrepancy in a large BD patient cohort.

Methods: Data from 109 remitted BD patients and 110 healthy controls were pooled from previous studies, including neuropsychological test scores, self-reported cognitive difficulties, and ratings of mood, stress, socio-occupational capacity, and quality of life. Cognitive symptom 'sensitivity' scores were calculated using a novel methodology, with positive scores reflecting disproportionately more subjective complaints than objective impairment and negative values reflecting disproportionately more objective than subjective impairment ('stoicism').

Results: More subsyndromal depressive and manic symptoms, hospitalizations, BD type II, and being male positively predicted 'sensitivity', while higher verbal IQ predicted more 'stoicism'. 'Sensitive' patients were characterized by greater socio-occupational difficulties, more perceived stress, and lower quality of life.

Conclusion: Objective neuropsychological assessment seems especially warranted in patients with (residual) mood symptoms, BD type II, chronic illness, and/or high IQ for correct identification of cognitive deficits before commencement of treatments targeting cognition.

Keywords: bipolar disorder; cognition; methodology; quality of life; stress.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adult
  • Bipolar Disorder / complications*
  • Cognitive Dysfunction / diagnosis*
  • Cognitive Dysfunction / etiology
  • Cognitive Dysfunction / physiopathology
  • Cross-Sectional Studies
  • Female
  • Humans
  • Male
  • Middle Aged
  • Neuropsychological Tests
  • Self Report