著者は以前に、ヒトの脳電図に対する携帯電話GSM電磁界への長時間ばく露(45分間)の影響として、側頭および前頭の安静時脳電図リズムの脳半球間同期の変調を若年被験者について報告した。今回は、前回と同じ条件で健康な高齢被験者16名と若年被験者5名の脳電図を、ばく露時および擬似ばく露時の2回記録した。高齢者群16名と若齢者群15名(前回実験の10名のデータと今回の5名のデータ)について、α、θ、δ帯域における脳電図リズムの脳半球間同期の程度を表すスペクトラムコヒーレンスを比較した結果、ばく露時のα帯におけるコヒーレンスが若齢者群より高齢者群で有意に増加するなど、加齢による差異が見られたと報告している。
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In a previous study (Vecchio et al. 2007) it has been reported that GSM electromagnetic fields of a mobile phone modulate inter-hemispheric synchronization (an important physiological feature of information transfer into the brain) of temporal and frontal resting EEG rhythms in normal young subjects.
In the present study, the authors tested the hypothesis that this effect can vary with physiological aging as a sign of changes in the functional organization of cortical neural synchronization.
Eyes-closed resting EEG data were recorded in 16 healthy elderly subjects (60.75 ± 2.87 years) and 5 young subjects (30 ± 1.26 years) in the same two conditions of the previous study (GSM device was turned on (45 min) in one condition and was turned off (45 min) in the other condition). The aging effects were investigated comparing the inter-hemispheric EEG coherence in the elderly subjects vs. a young group formed by 15 young subjects (including 10 young subjects of the previous study).
Individual EEG rhythms of interest were delta waves (about 2-4 Hz), theta waves (about 4-6 Hz), alpha wave 1 (about 6-8 Hz), alpha wave 2 (about 8-10 Hz) and alpha wave 3 (about 10-12 Hz).
周波数 | 902.4 MHz |
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タイプ |
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ばく露時間 | continuous for 45 min |
Modulation type | pulsed |
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Repetition frequency | 217 Hz |
ばく露の発生源/構造 |
|
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Distance between exposed object and exposure source | 1.5 cm |
ばく露装置の詳細 | commercially available standard phone positioned on the left side next to the ear by a modified helmet; another phone, which was switched off, was on the right side; antenna placed in the parieto-tempoaral area about 4 cm from the head |
Sham exposure | A sham exposure was conducted. |
Compared with the young subjects, the elderly subjects showed a statistically significant increment of the inter-hemispheric coherence of frontal and temporal alpha wave rhythms (about 8-12 Hz) during the GSM condition. In conclusion, these data suggest that GSM electromagnetic fields of a mobile phone affect inter-hemispheric synchronization of the dominant (alpha wave) EEG rhythms as a function of the physiological aging. This study provides further evidence that physiological aging is related to changes in the functional organization of cortical neural synchronization.
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