Study type: Medical/biological study (experimental study)

Mobile phones modulate response patterns of human brain activity. med./bio.

Published in: Neuroreport 1998; 9 (14): 3229-3232

Aim of study (acc. to author)

To determine empirically whether radiation generated by cellular phones might affect neural responses. The study investigated a different set of cognitive tasks for influences of pulsed high-frequency electromagnetic field on EEG.

Endpoint

Exposure

Exposure Parameters
Exposure 1: 916.2 MHz
Modulation type: pulsed
Exposure duration: see add. information
  • power: 2.8 W peak value

Exposure 1

Main characteristics
Frequency 916.2 MHz
Type
Exposure duration see add. information
Modulation
Modulation type pulsed
Pulse width 577 µs
Repetition frequency 217 Hz
Additional info

no acoustic signal transmission nor power management

Exposure setup
Exposure source
Setup The mobile phone was mounted on the subject's head such that the base of the antenna was positioned over the left temporal region. The transmitter was operated from a separate room.
Additional info Four blocks of 450 stimuli (with interstimulus intervals of 2 s) were presented according to a balanced plan under single-blind conditions. During two of the blocks EMF was emitted from the antenna.
Parameters
Measurand Value Type Method Mass Remarks
power 2.8 W peak value - - -

Exposed system:

Methods Endpoint/measurement parameters/methodology

Investigated system:
Investigated organ system:
Time of investigation:
  • during exposure

Main outcome of study (acc. to author)

The study demonstrated that pulsed electromagnetic fields may alter distinct aspects of the brain electrical response to acoustic stimuli. The data demonstrate that the induced, but not the evoked, brain activity during exposure can be different from that not influenced by electromagnetic fields. The effect appeared when subjects processed task-relevant target stimuli but was not present for irrelevant standard/novel stimuli. When present, exposure modulated mainly the induced brain activity in the hemispheric directly exposed to the electromagnetic radiation and only in the high-frequency band.

Study character:

Study funded by

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