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To study whether exposure to pulsed radiofrequency electromagnetic field emitted by a mobile phone has short-term effects on the visuo-motor choice reaction time and movement time.
16 subjects participated. Within the choice reaction time task the subjects had to press one of two buttons with left or right hand as quickly as possible after the go-signal. A precue preceding this conveyed full, partial or no advance information (hand and/or button), such that reaction time shortened with increasing amount of information. The precuing effect has been taken to reflect motor preparation.
The exposure setup was the same as described in [Arai et al., 2003].
|ばく露時間||continuous for 30 min|
|Pulse width||6.7 ms|
|Repetition frequency||50 Hz|
3 channel TDMA with π/4 shifted quadrature phase-shift keying
|Distance between exposed object and exposure source||2 cm|
|チャンバの詳細||The subjects were comfortably seated in a chair.|
|ばく露装置の詳細||The subjects held the handset over the right ear in a normal use position and spoke to one of the examiners through the air. The antenna was located about 2 cm from the head and 3 cm from the brain tissue. The auditory circuitry of the handset was disabled.|
|Sham exposure||A sham exposure was conducted.|
|Additional information||A double blind, counterbalanced crossover design was used. The sessions under real and sham exposure were separated by at least 7 days.|
The reaction times and movement times under different conditions of precue information were not affected by exposure to the cell phone or by sham exposure. In conclusion, 30 minutes of mobile phone use has no significant short-term effect on the cortical visuo-motor processing.