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Related Experiment Video

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Author Spotlight: Unveiling the Connection Between Sleep Disorders and Cognitive Symptoms in Depression
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A highly replicable decline in mood during rest and simple tasks.

David C Jangraw1,2, Hanna Keren3, Haorui Sun4

  • 1National Institute of Mental Health, Bethesda, MD, USA. djangraw@uvm.edu.

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Summary

Mood naturally declines over time, an effect termed "Mood Drift Over Time." This consistent finding across nearly 30,000 participants highlights the need to consider time

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Area of Science:

  • Affective science
  • Behavioral science
  • Psychology

Background:

  • The dynamics of mood over time are largely unexamined.
  • Understanding mood fluctuations is crucial for behavioral and affective science.

Purpose of the Study:

  • To investigate whether subjective mood changes over time.
  • To identify and characterize the phenomenon of mood change during psychological tasks.

Main Methods:

  • Incorporated subjective momentary mood ratings into repetitive psychology experiments.
  • Collected data from 19 cohorts, totaling 28,482 adult and adolescent participants.
  • Analyzed mood changes in relation to task and rest periods.

Main Results:

  • Identified a significant decline in mood during both task and rest periods, termed 'Mood Drift Over Time'.
  • The mood drift was substantial (e.g., -13.8% after 7.3 min of rest) and consistent across diverse cohorts.
  • Observed behavioral changes, such as reduced gambling likelihood after rest, and an inverse relationship between mood drift slope and reward sensitivity.

Conclusions:

  • Mood naturally drifts downward over time, impacting both subjective experience and behavior.
  • The 'Mood Drift Over Time' effect is robust and warrants consideration in psychological research.
  • Accounting for time's linear effect improves computational models of mood.