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Deficits in spatial learning after exposure of mice to a 50 Hz magnetic field
Z J Sienkiewicz1, R G Haylock, R D Saunders
1National Radiological Protection Board, Didcot, Oxfordshire, United Kingdom.
Abstract:
A series of four experiments was performed to determine the effect of exposure to a 50 Hz magnetic field on memory-related behaviour of adult, male C57BL/6J mice. Experimental subjects were exposed to a vertical, sinusoidal magnetic field at 0.75 mT (rms), for 45 min immediately before daily testing sessions on a spatial learning task in an eight-arm radial maze. Control subjects were only exposed to a background time-varying field of less than 50 nT and the ambient static field of about 40 microT. In each experiment, exposure significantly reduced the rate of acquisition of the task but did not affect overall accuracy. This finding is consistent with the results of another study that found that prior exposure to 60 Hz magnetic fields affected spatial learning in rats.
Insights
Exposure to a 50 Hz magnetic field impaired spatial learning acquisition in mice. While magnetic field exposure slowed learning rates, it did not impact overall task accuracy in the radial maze tests.
Area of Science:
- Neuroscience
- Bioelectromagnetics
- Animal Behavior
Background:
- Investigating the impact of electromagnetic fields on cognitive functions is crucial.
- Previous studies suggest potential effects of magnetic fields on learning and memory.
Purpose of the Study:
- To determine the effect of 50 Hz magnetic field exposure on memory-related behavior in adult male mice.
- To assess the influence of magnetic fields on spatial learning acquisition and accuracy.
Main Methods:
- Four experiments were conducted using adult, male C57BL/6J mice.
- Subjects were exposed to a 0.75 mT (rms) sinusoidal magnetic field for 45 minutes before daily testing.
- Spatial learning was assessed using an eight-arm radial maze task.
Main Results:
- Magnetic field exposure significantly reduced the rate of task acquisition in all experiments.
- No significant effect on overall accuracy was observed.
- Results align with studies showing 60 Hz magnetic fields affecting spatial learning in rats.
Conclusions:
- Exposure to a 50 Hz magnetic field negatively impacts the speed of spatial learning acquisition.
- The findings suggest a specific effect on learning rate rather than overall performance accuracy.
- Further research into the neurobiological mechanisms underlying these effects is warranted.