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Published on: March 10, 2017
Delayed Correlations Between Geomagnetic Activity and Human EEG Alpha and Theta Oscillations: Evidence from Archival
Carlee D Chezzi1, Kevin S Saroka1, Kate S Branigan1
1Behavioural Neuroscience & Biology Programs, School of Natural Science, Laurentian University, Sudbury, ON P3E 2C6, Canada.
Brain Sciences
|June 26, 2026
Summary
Geomagnetic activity influences human brain oscillations, particularly in alpha and theta bands. A 19-day delay suggests residual effects of geomagnetic disturbances on neural dynamics.
Area of Science:
- Neuroscience
- Environmental Science
- Geophysics
Background:
- Neural oscillations in alpha and theta bands are linked to environmental factors.
- The temporal dynamics of geomagnetic disturbances' effects on brain activity are not well understood.
Purpose of the Study:
- To investigate the relationship between geomagnetic activity (Kp index) and human brain oscillations (alpha and theta bands).
- To explore the temporal dynamics and potential delayed effects of geomagnetic activity on neural activity.
Main Methods:
- Archival EEG data from 238 subjects analyzed for correlations with Kp index over a ±90-day window.
- Experimental exposure of 22 participants to a simulated geomagnetic storm with EEG recordings pre- and post-exposure (19 days apart).
Main Results:
- Significant positive correlations found between Kp index and theta/low alpha band power, peaking 19 days prior to EEG measurement.
- Significant reductions in theta, low alpha, and high alpha power observed 19 days after simulated geomagnetic storm exposure.
Conclusions:
- Converging correlational and experimental evidence supports a lagged influence of geomagnetic activity on human brain oscillations.
- A 19-day delay suggests geomagnetic disturbances may have residual effects on neural dynamics beyond immediate exposure.
