Brain serotonin transporter remains stable across seasons: A Bayesian and frequentist meta-analysis.
Kyoungjune Pak
✦ AI-curated · Sources linked
In 30 seconds
This meta-analysis examined seasonal variations in brain serotonin transporter (SERT) availability in healthy individuals using neuroimaging studies. The analysis included seven studies and found no significant seasonal difference in SERT availability overall (0.11; 95% CI, -0.29 to 0.51). However, unpaired cross-sectional studies indicated a significant wintertime increase in SERT, while paired longitudinal studies showed stability.
Key findings
- Overall pooled effect size indicated no significant seasonal difference in SERT availability (0.11; 95% CI, -0.29 to 0.51).
- Unpaired cross-sectional studies showed a significant wintertime SERT increase, particularly in the brainstem and thalamus.
- Paired longitudinal studies demonstrated no significant seasonal variation in SERT availability (-0.26; 95% CI, -0.63 to 0.12; I²=0%).
- Study design was confirmed as a significant moderator in meta-regression analyses.
Why it matters
Understanding the stability of SERT availability across seasons is crucial for developing effective treatments for seasonal affective disorder (SAD). This study suggests that observed wintertime increases in SERT may indicate a vulnerability rather than a normal physiological response.