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Orbitofrontal cortex activity related to emotional processing changes across the menstrual cycle.

Xenia Protopopescu1, Hong Pan, Margaret Altemus

  • 1Functional Neuroimaging Laboratory, Department of Obstetrics and Gynecology, Weill Medical College of Cornell University, New York, NY 10021, USA.

Proceedings of the National Academy of Sciences of the United States of America
|October 26, 2005
PubMed
Summary

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Orbitofrontal cortex (OFC) activity during emotional processing changes with the menstrual cycle. This suggests that hormonal fluctuations influence brain regions involved in emotion and decision-making.

Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Affective Neuroscience

Background:

  • The orbitofrontal cortex (OFC) plays a crucial role in processing emotions, assigning value to stimuli, and regulating social-emotional behavior.
  • Understanding how physiological factors modulate neural activity in the OFC is essential for comprehending emotional regulation and decision-making.

Purpose of the Study:

  • To investigate whether menstrual cycle phase influences orbitofrontal cortex (OFC) activity in response to emotional stimuli.
  • To identify specific subregions of the OFC whose activity is modulated by menstrual cycle phase.

Main Methods:

  • Functional magnetic resonance imaging (fMRI) was employed in female participants without premenstrual mood symptoms.
  • Participants viewed emotional (negative vs. neutral) linguistic stimuli during different phases of their menstrual cycle.

Related Experiment Videos

Main Results:

  • Orbitofrontal cortex (OFC) activity in response to negative versus neutral stimuli varied significantly across menstrual cycle phases.
  • Anterior-medial OFC showed increased activity for negative stimuli premenstrually and decreased activity postmenstrually.
  • The lateral OFC exhibited an inverse pattern of activity modulation compared to the anterior-medial OFC.

Conclusions:

  • Orbitofrontal cortex (OFC) subregional activity in response to emotional stimuli is modulated by the menstrual cycle.
  • Menstrual cycle phase represents a significant variable that must be considered in neuroimaging studies of affective representation.
  • These findings contribute to a deeper understanding of the neural mechanisms underlying emotional processing and its cyclical variations.