Study type: Medical/biological study (experimental study)

Evidence of a nonlinear human magnetic sense. med./bio.

Published in: Neuroscience 2007; 144 (1): 356-367

Aim of study (acc. to author)

This in vivo study was performed to detect possible evoked potentials in human EEG due to magnetic fields exposure (magneto-sensory potentials).

Background/further details

Seventeen clinically normal subjects (eight men, nine women, age range: 18-51) took part in this study. Magneto-sensory evoked potentials were determined by using a) recurrence analysis (linear and nonlinear determinism) and b) time averaging method (only linear determinism). As a positive control, a binaural 424 Hz tone (sound pressure level: 65 dB) was presented.

Endpoint

Exposure

Exposure Parameters
Exposure 1: 60 Hz
Exposure duration: 2 s

Exposure 1

Main characteristics
Frequency 60 Hz
Type
Exposure duration 2 s
Exposure setup
Exposure source
Setup two sets of coils 65 cm apart; each set consisting of a circular coil with a radius of 26.1 cm and 21 turns and two square coils 48.3 cm side lenght and 85 turns and 66 cm side length and 120 turns
Sham exposure A sham exposure was conducted.
Parameters
Measurand Value Type Method Mass Remarks
magnetic flux density 200 µT - - - -

Exposed system:

Methods Endpoint/measurement parameters/methodology

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

Main outcome of study (acc. to author)

Using the method of recurrence analysis, magneto-sensory evoked potentials in the signals from occipital derivations were found in 16 of the subjects. Magneto-sensory evoked potentials in the signals from the central and parietal electrodes were found in most subjects.
Using the method of time averaging, no magneto-sensory evoked potentials were detected in any brain region.

Study character:

Study funded by

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