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Abstract Title:

Greater electroencephalographic coherence between left and right temporal lobe structures during increased geomagnetic activity.

Abstract Source:

Neurosci Lett. 2014 Feb 7 ;560:126-30. Epub 2013 Nov 25. PMID: 24287380

Abstract Author(s):

Kevin S Saroka, Joseph M Caswell, Andrew Lapointe, Michael A Persinger

Article Affiliation:

Kevin S Saroka

Abstract:

Interhemispheric coherence for 19 channel EEG activity collected over a three year period from 184 men and women who relaxed in a quiet, darkened chamber showed significant increased coherence between caudal temporal regions for the 11 Hz frequency band during increased (>∼8 nT) global geomagnetic activity at the time of measurement. Detailed analyses from source-localization indicated that a likely origin was the parahippocampal regions whose net differences at 10, 11 and 12 Hz intervals were significantly correlated with geomagnetic activity. Analyses of residuals to obtain a"purer"measure of parahippocampal contributions indicated that interhemispheric temporal lobe coherence across unit increments between 1 and 40 Hz revealed the most statistically significant peaks at 7.5 Hz and 19.5 Hz. These weak but reliable correlations between global geomagnetic activity and the degree of inter-temporal lobe coherence for normal people relaxing in a dark, quiet area are consistent with the results of multiple studies indicating that intrusive experiences such as"presences"or"hallucinations"are more frequent when global geomagnetic activity increases above∼15-20 nT.

Study Type : Human Study
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Additional Keywords : Geomagnetic Activity

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