Estradiol modulates changes in effective connectivity in emotion regulation networks

Area of Science:

• Neuroscience
• Endocrinology
• Psychology

Background:

• Ovarian hormones, particularly estradiol (E2), impact emotional processing, including recognition, memory, and regulation.
• Previous research utilized task-based fMRI to explore E2's neural underpinnings in emotional experience.

Purpose of the Study:

• To investigate if intrinsic network dynamics at rest, specifically directed effective connectivity, are modulated by E2 levels.
• To determine if these resting-state network dynamics are linked to behavioral emotion regulation ability.

Main Methods:

• 29 naturally cycling women underwent two resting-state fMRI scans, receiving either placebo or E2 valerate.
• Emotion regulation ability was assessed via a task requiring down-regulation of emotional responses to negative images.
• Spectral dynamic causal modeling analyzed effective connectivity within predefined neural networks for emotion regulation and reactivity.

Main Results:

• Estradiol (E2) administration altered effective connectivity in both emotion regulation and reactivity networks compared to placebo.
• Distinct connectivity patterns were observed in prefrontal regions of the regulation network under E2.
• A parietal-to-prefrontal cortex connection in the E2 condition predicted emotion regulation ability.

Conclusions:

• Estradiol levels significantly influence the effective connectivity of neural networks involved in emotion regulation and reactivity.
• Hormonal modulation of E2 may offer a supportive role in treating emotional dysregulation disorders.