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Related Experiment Video

Updated: Jun 8, 2026

A New Method for Inducing a Depression-Like Behavior in Rats
07:57

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Published on: February 22, 2018

Cross-sectional and longitudinal relations between affective instability and depression.

Renee J Thompson1, Howard Berenbaum, Keith Bredemeier

  • 1University of Illinois at Urbana-Champaign, United States. reneet@stanford.edu

Journal of Affective Disorders
|October 19, 2010
PubMed
Summary

Emotional traits like affective instability are linked to major depressive disorder (MDD). Affect variability, a facet of affective instability, specifically predicts anhedonic depression, suggesting mood fluctuations are a risk factor.

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Area of Science:

  • Psychiatry
  • Clinical Psychology
  • Emotional Regulation

Background:

  • Emotional traits are increasingly recognized as crucial for understanding mental health disorders like major depressive disorder (MDD).
  • Affective instability, characterized by rapid and intense mood shifts, is a key emotional trait under investigation.
  • The specific facets of affective instability, namely affect intensity and affect variability, require further examination in relation to depression subtypes.

Purpose of the Study:

  • To investigate the relationship between major depressive disorder (MDD) and the emotional trait of affective instability.
  • To determine if affect intensity and affect variability uniquely relate to anhedonic depression.
  • To prospectively assess the predictive power of affect variability and intensity on changes in anhedonic depression.

Main Methods:

  • Study 1 utilized clinical interviews to assess affective instability and MDD in an adult community sample (n=288).
  • Studies 2 and 3 employed cross-sectional self-report measures in college students (n=142) and female community members (n=101) to examine anhedonic depression.
  • Study 3 additionally included a two-month prospective follow-up to evaluate the predictive role of affect facets on anhedonic depression.

Main Results:

  • Affective instability showed a significant association with MDD in Study 1, independent of current depressive episodes.
  • Affect variability, but not affect intensity, was significantly and positively linked with anhedonic depression across Studies 2 and 3.
  • Affect variability prospectively predicted increases in anhedonic depression in Study 3, while affect intensity did not.

Conclusions:

  • Affective instability and its facet, affect variability, are significantly associated with MDD and anhedonic depression.
  • Frequent mood fluctuations (affect variability) may serve as a critical risk factor for developing or exacerbating depression.
  • Future research should explore the full spectrum of bipolar disorder and employ event-sampling methods to capture temporal dynamics of affective instability.