EMF-Portal | Effects of thirty-minute mobile phone exposure on saccades

Effects of thirty-minute mobile phone exposure on saccades med./bio.

By: Terao Y, Okano T, Furubayashi T, Yugeta A, Inomata-Terada S, Ugawa Y

Published in: Clin Neurophysiol 2007; 118 (7): 1545-1556

Aim of study (acc. to author)

Background/further details

The performance of different saccade tasks before and after exposure or sham exposure were studied in 10 normal subjects.

Endpoint

effects on eye (cortical processing/saccade performance)

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)

Exposure 1

Main characteristics

Frequency	800 MHz
Type	electromagnetic field
Exposure duration	continuous for 30 min

Modulation

Modulation type	pulsed
Pulse width	6.7 ms
Duty cycle	33.5 %
Repetition frequency	50 Hz
Additional info	π/4 shifted QPSK; three channel TDMA with 20 ms frame length and 6.7 ms time slot

Exposure setup

Exposure source	cellular phone connected to a communication tester, set to maximum output
Distance between exposed object and exposure source	3 cm
Chamber	The setup was the same as that described in [Arai et al., 2003] and [Terao et al., 2006].
Setup	The handset was held over the right ear in a normal use position with the antenna located about 2 cm from the head and about 3 cm from the brain tissue.
Sham exposure	A sham exposure was conducted.
Additional info	The subjects spoke to an examiner but not on the phone. The audio circuitry of the phone was disabled.

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

Measurement and calculation details

SARs in the brain area (30 mm below the skull) were measured with a phantom system used according to IEC recommendations. Values measured with the handset at several positions did not differ significantly [Terao et al., 2006].

Reference articles

Terao Y et al. (2006): Effects of thirty-minute mobile phone use on visuo-motor reaction time
Arai N et al. (2003): Thirty minutes mobile phone use has no short-term adverse effects on central auditory pathways

Exposed system:

human
partial body: head (right ear)

Methods Endpoint/measurement parameters/methodology

Investigated system:

investigation on living organism

Investigated organ system:

Time of investigation:

before exposure
after exposure

Main outcome of study (acc. to author)

Study funded by

Committee to Promote Research on the Possible Biological Effects of Electromagnetic Fields, Japan

Ministry of Internal Affairs and Communications, Japan

Okano T et al. (2010): The effect of electromagnetic field emitted by a mobile phone on the inhibitory control of saccades

Irlenbusch L et al. (2007): Influence of a 902.4 MHz GSM signal on the human visual system: Investigation of the discrimination threshold