研究のタイプ: 医学/生物学の研究 (experimental study)

[ヒトの事象関連電位と反応時間の携帯電話で放射される電磁界に対する感受性]. med./bio.

The sensitivity of human event-related potentials and reaction time to mobile phone emitted electromagnetic fields.

掲載誌: Bioelectromagnetics 2006; 27 (4): 265-273

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研究目的(acc. to author and editor)

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.

詳細情報

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.

影響評価項目

ばく露

ばく露 パラメータ
ばく露1: 895 MHz
Modulation type: pulsed
ばく露時間: continuous for about 21 min
  • 電力: 2 W peak
  • 電力: 250 mW mean
  • SAR: 0.11 W/kg average over mass (10 g)

ばく露1

主たる特性
周波数 895 MHz
タイプ
  • electromagnetic field
ばく露時間 continuous for about 21 min
Modulation
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.

ばく露装置
ばく露の発生源/構造
  • セルラ-電話
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.
パラメータ
測定量 種別 Method Mass 備考
電力 2 W peak - - -
電力 250 mW mean - - -
SAR 0.11 W/kg average over mass 測定値 10 g -

ばく露を受けた生物:

方法 影響評価項目/測定パラメータ/方法

研究対象とした生物試料:
研究対象とした臓器系:
  • 感覚器
  • CNS
調査の時期:
  • ばく露前
  • ばく露中
  • ばく露後

研究の主なアウトカム(著者による)

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.

研究の種別:

研究助成

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