Study type: Medical/biological study (experimental study)

Effects of thirty-minute mobile phone use on visuo-motor reaction time. med./bio.

Published in: Clin Neurophysiol 2006; 117 (11): 2504-2511

Aim of study (acc. to author)

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.

Background/further details

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.

Endpoint

Exposure

Exposure Parameters
Exposure 1: 800 MHz
Modulation type: pulsed
Exposure duration: continuous for 30 min
  • power: 0.8 W peak value
  • power: 0.27 W mean
  • SAR: 0.054 W/kg average over mass (10 g) (± 0.02 W/kg)

General information

The exposure setup was the same as described in [Arai et al., 2003].

Exposure 1

Main characteristics
Frequency 800 MHz
Type
Exposure duration continuous for 30 min
Modulation
Modulation type pulsed
Pulse width 6.7 ms
Repetition frequency 50 Hz
Additional info

3 channel TDMA with π/4 shifted quadrature phase-shift keying

Exposure setup
Exposure source
  • cellular phone
  • handset connected to a communication tester, at maximum output
Distance between exposed object and exposure source 2 cm
Chamber The subjects were comfortably seated in a chair.
Setup 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 info A double blind, counterbalanced crossover design was used. The sessions under real and sham exposure were separated by at least 7 days.
Parameters
Measurand Value Type Method Mass Remarks
power 0.8 W peak value - - -
power 0.27 W mean - - -
SAR 0.054 W/kg average over mass measured 10 g ± 0.02 W/kg

Reference articles

  • Arai N et al. (2003): Thirty minutes mobile phone use has no short-term adverse effects on central auditory pathways.

Exposed system:

Methods Endpoint/measurement parameters/methodology

Investigated system:
Investigated organ system:
Time of investigation:
  • before exposure
  • after exposure

Main outcome of study (acc. to author)

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.

Study character:

Study funded by

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