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Related Experiment Videos

EEG oscillations during menstrual cycle

S Solís-Ortiz1, J Ramos, C Arce

  • 1Instituto de Investigaciones Biomédicas, Universidad Nacional Autónoma de México, México, D.F.

The International Journal of Neuroscience
|June 1, 1994
PubMed
Summary
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This study on women's menstrual cycles found significant changes in brain activity using electroencephalography (EEG). Menstrual phase influences brainwave power and connectivity, suggesting cyclical neurological variations.

Area of Science:

  • Neuroscience
  • Women's Health
  • Physiology

Background:

  • The menstrual cycle is associated with hormonal fluctuations.
  • These hormonal changes may influence brain function and electroencephalography (EEG) patterns.
  • Understanding these variations is crucial for women's health research.

Purpose of the Study:

  • To investigate changes in brain activity during different phases of the menstrual cycle.
  • To analyze electroencephalography (EEG) power and connectivity patterns across the cycle.
  • To identify potential correlations between menstrual phase and neurological activity.

Main Methods:

  • Electroencephalography (EEG) was recorded from 9 women with regular menstrual cycles.
  • 12 EEG sessions were conducted every second day, covering different menstrual phases.

Related Experiment Videos

  • Analysis included absolute and relative power, and interhemispheric correlations at specific scalp locations (F3, F4, C3, C4, P3, P4, O1, O2).

    • Main Results:

    • Absolute EEG power was lower during the periovulatory period.
    • Delta, theta, and alpha 1 power increased during the premenstrual phase.
    • Alpha 2, beta 1, and beta 2 power were higher during menstruation.
    • Relative power of low alpha frequencies decreased, while high frequencies increased premenstrually.
    • Interhemispheric frontal correlation was higher during ovulation, and occipital correlation was higher premenstrually.
    • No significant power asymmetries were observed between hemispheres.

    Conclusions:

    • Menstrual cycle phase significantly impacts brain activity patterns, including EEG power spectra.
    • Centro-parietal regions show higher activation during menstruation.
    • Frontal regions exhibit lower activation during the premenstrual phase.
    • Findings suggest cyclical neurological variations related to the menstrual cycle.