この研究は、携帯電話（MP）へのばく露が神経活動に影響を与える可能性を、二重ブラインド化、カウンターバランス、クロスオーバーデザインのボランティア実験（n = 120）で調べた。被験者は1週間間隔で2回のセッションに参加した。1回目のセッションでは、被験者の側頭領域に取り付けたMPを擬似ばく露に設定、2回目のセッションではMPを真のばく露または擬似ばく露に設定した。真のばく露設定の場合、MPは30分間、895 MHz（平均出力250 mW、217 Hz変調パルス、平均SAR 0.11 W / kg）を送信した。被験者は両セッションにおいて、脳電図（EEG）記録されながら、聴覚および視覚のオドボールタスクを遂行した。対応のあるt検定で、擬似ばく露/擬似ばく露条件の差分スコアを擬似ばく露/真のばく露での差分スコアと比較した。標準偏差の1 /4の差を検出力0.80で検出するように設計した。その結果、聴覚性または視覚性のイベント関連電位（ERP）コンポーネントまたはRTに、ばく露条件間での有意差はなかった、と報告している。
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The study aimed to replicate results of previous studies that suggest that exposure to mobile phones can affect neural activity, particularly in response to auditory stimuli.
Specific hypotheses were derived to test the data of a previous pilot study (see publication 10469) as well as recent positive results more generally (see publication 3601, publication 9357, and publication 11230). These hypotheses were that the N100 amplitude and N100 latency would decrease and that the P300 latency and reaction time would increase under active exposure relative to sham exposure during the auditory task.
| 周波数 | 895 MHz |
|---|---|
| タイプ |
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| ばく露時間 | continuous for about 21 min |
| Modulation type | pulsed |
|---|---|
| Pulse width | 576 µs |
| Duty cycle | 12.5 % |
| Repetition frequency | 217 Hz |
| Additional information |
DTX (discontinuous transmission) and APC (adaptive power control) modes were not employed. |
| ばく露の発生源／構造 |
|
|---|---|
| チャンバの詳細 | Participants were fitted with the EEG recording apparatus and seated in a comfortable chair 1.5 m in front of a computer monitor. |
| ばく露装置の詳細 | A mobile phone was mounted over the temporal region (right or left side for half of the particpants) comparable to normal use (in ''touch'' position; FCC 2001 guidelines) using a plastic cradle-like apparatus. The handset's audio circuitry was disabled to avoid acoustic cues about the status of the phone. Additionally, padding was placed between the handset and its leather casing to silence buzzing sounds coming from the circuitry and to insulate against heat generated by the battery. |
| Sham exposure | A sham exposure was conducted. |
| Additional information | A first 21-min experimental period of sham exposure was followed, after 10 min of resting, by another 21-min period of exposure or sham exposure. A double-blind, pseudorandom, counterbalanced, crossover design was employed where subjects attended two sessions 1 week apart. |
There was no significant difference between exposure conditions for any auditory or visual event related potential component or reaction time. As previous positive findings were not replicated, it was concluded that there is currently no evidence that acute mobile phone exposure affects these indices of brain activity.
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