Study type: Medical/biological study (experimental study)

Evidence of synchronization of neuronal activity of molluscan brain ganglia induced by alternating 50 Hz applied magnetic field. med./bio.

Published in: Electromagn Biol Med 2002; 21 (3): 209-220

Aim of study (acc. to author)

To study the effects of magnetic fields on the bioelectric activity of the neurons from the brain ganglia of the snail Helix aspersa.

Background/further details

Experiments were performed on single unit neurones and on pairs of neurons selected from snail "brain" ganglia (n=10), making intracellular bioelectric recordings in real time. Synchronization of the firing rate of pairs of neurons under an applied magnetic alternating field was investigated.



Exposure Parameters
Exposure 1: 50 Hz
Exposure duration: each magnetic flux intensity applied for 15 s with 1 min intervals

Exposure 1

Main characteristics
Frequency 50 Hz
Exposure duration each magnetic flux intensity applied for 15 s with 1 min intervals
Exposure setup
Exposure source
Setup pair of Helmholtz coils with a diameter of 11 cm, separated by 5.5 cm producing a highly homogeneous field oriented in east-west direction in respect to the brain ganglia; samples placed between the coils
Measurand Value Type Method Mass Remarks
magnetic flux density 1 mT minimum - - -
magnetic flux density 15 mT maximum - - -

Methods Endpoint/measurement parameters/methodology

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

Main outcome of study (acc. to author)

The data showed experimental evidence for the appearance of synchronized bioelectric activity in neurons under applied extremely low frequency magnetic fields. Synchronization was observed in 27% of the neuron pairs tested under 50 Hz magnetic field exposure in the range of 1-15 mT. A linear dependence of the firing frequency on the energy density of the applied magnetic field was presented.

Study character:

Study funded by

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