Anhedonia is associated with blunted reward sensitivity in first-degree relatives of patients with major depression

W.-H. Liu, J.P. Roiser, L.-Z. Wang, Y.-H. Zhu, J. Huang, D.L. Neumann, Ho Keung David Shum, E.F.C. Cheung, R.C.K. Chan

Research output: Journal article publicationJournal articleAcademic researchpeer-review

22 Citations (Scopus)

Abstract

© 2015 Elsevier B.V.Background Anhedonia is a cardinal feature of major depression and is hypothesized to be driven by low motivation, in particular blunted reward sensitivity. It has been suggested to be a marker that represents a genetic predisposition to this disorder. However, little is known about the mechanisms underlying this heightened risk in unaffected first-degree relatives of patients with major depression. We previously demonstrated abnormal reward biases in acutely depressed patients. The present study aimed to examine the development of reward bias in first-degree relatives of patients with major depression. Methods Forty-seven first-degree relatives of patients with major depression (26 females, age 18-52) and 60 healthy controls with no family history of depression (34 females, age 21-48) were recruited. A probabilistically rewarded difficult visual discrimination task, in which participants were instructed about the contingencies, was used to assess blunted reward sensitivity. A response bias towards the more frequently rewarded stimulus (termed "reward bias") was the primary outcome variable in this study. Participants also completed self-reported measures of anhedonia and depressive symptoms. Results Compared with the control group, relatives of patients with major depression with sub-clinical depressive symptoms displayed a blunted reward bias. Relatives without symptoms displayed largely intact motivational processing on both self-report and experimental measures. The degree of anhedonia was associated with attenuated reward bias in first-degree relatives of patients with major depression, especially in those with sub-clinical symptoms. Limitations The study did not include a depressed patient group, which restricted our ability to interpret the observed group differences. Conclusions Blunted reward sensitivity may be largely manifested in a subgroup of relatives with high levels of depressive symptoms.
Original languageEnglish
Pages (from-to)640-648
Number of pages9
JournalJournal of Affective Disorders
Volume190
DOIs
Publication statusPublished - 15 Jan 2016
Externally publishedYes

Keywords

  • Anhedonia
  • Depression
  • Reward
  • Risk factors

ASJC Scopus subject areas

  • Clinical Psychology
  • Psychiatry and Mental health

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