Abstract
Six patients with bipolar II seasonal affective disorder (SAD) and seven normal control subjects rated their moods in winter at six fixed times each week-day during 1 week of dim and 2 weeks of bright light. The scales rated represent the mood dimension specifically associated with depression, a dimension here called behavioral engagement (BE). Compared with controls, depressed SAD subjects (1) showed lower BE levels across all rating times of the day, (2 ) were more likely to show diurnal variation in BE, (3) displayed more between-day instability in BE diurnal rhythm, and (4) exhibited greater short-term lability (change within 3 hours) in BE. Bright light reduced or eliminated all group differences in BE level and variability.
Original language | English (US) |
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Pages (from-to) | 147-160 |
Number of pages | 14 |
Journal | Psychiatry Research |
Volume | 43 |
Issue number | 2 |
DOIs | |
State | Published - Aug 1992 |
Bibliographical note
Funding Information:Acknowledgments. The research reported was supported by National Institute of Mental Health Research grant MH-37195 to Dr. Depue. The authors thank Rachel Muir for her technical assistance.
Keywords
- Depression
- mood variability
- phototherapy