Do you want to give a feedback on our extract of the article?
Medical/biological Study (experimental study)
A magnetic field effect on learning in male golden hamsters. med./biol. By: Lopuch S
Published in: Behav Processes 2009; 81 (1): 133 - 135 ( PubMed Entry , Journal web site )
Aim of study (according to author)
To investigate the influence of repeated exposure to 10, 20, 30 or 40 Hz magnetic fields on the learning behavior of hamsters in a skinner box.
Male hamsters were assigned randomly to an exposure group (n=12) or sham exposure group (n=12).
The behavioural tests in the skinner box were performed on the following day after the last exposure. In the Skinner box the animals learned to press a lever to receive a food reward (unconditioned stimulus), which was associated with the sound of pressing the lever (conditioned stimulus). As a result a conditioned response was created (index of learning).
General category: magnetic field, low frequency field, signals/pulses
FIELD View further expo parameters
animal (species/strain): golden hamster (Mesocricetus auratus)
whole body exposure
investigation on living organism
- cognitive/behavioral endpoints: conditioned response: number of presses of the lever, associated with eating the food tablet; latency of the first response
time of investigation: after exposure
Main outcome of study (according to author)
The latency of the first response was not affected by exposure to the magnetic fields.
No significant effects on the performance of the task were observed in animals exposed to 10 and 20 Hz magnetic fields.
Exposure significantly improved the learning of the task in animals exposed to 30 and 40 Hz magnetic fields: The exposed animals needed fewer lever pressings to create the conditioned response and learned the task more quickly than sham-exposed animals.
The results indicate that the effects of magnetic fields on the process of learning in animals are dependent on the applied frequencies.
(Study character: medical/biological study, experimental study, full/main study, blind study)
Study funded byRelated articles
- Cui Y et al. (2012): Deficits in water maze performance and oxidative stress in the hippocampus and...
- Chen YB et al. (2011): Effect of Electromagnetic Pulses (EMP) on associative learning in mice and a...
- Choleris E et al. (2000): Sex differences in conditioned taste aversion and in the effects of exposure to...
- Sienkiewicz ZJ et al. (1998): Deficits in spatial learning after exposure of mice to a 50 Hz magnetic field.
- Sienkiewicz ZJ et al. (1998): 50 Hz magnetic field effects on the performance of a spatial learning task by...
- Lai H (1996): Spatial learning deficit in the rat after exposure to a 60 Hz magnetic field.
- Stern S et al. (1996): Exposure to combined static and 60 Hz magnetic fields: failure to replicate a...
- Sienkiewicz ZJ et al. (1996): Prenatal exposure to a 50 Hz magnetic field has no effect on spatial learning...
- Kavaliers M et al. (1996): Spatial learning in deer mice: sex differences and the effects of endogenous...
- Sienkiewicz ZJ et al. (1996): Acute exposure to power-frequency magnetic fields has no effect on the...
- Jentsch A et al. (1993): Weak magnetic fields change extinction of a conditioned reaction and daytime...
- Kavaliers M et al. (1993): Brief exposure to 60 Hz magnetic fields improves sexually dimorphic spatial...
- Trzeciak HI et al. (1993): Behavioral effects of long-term exposure to magnetic fields in rats.
- Rudolph K et al. (1985): Weak 50-Hz electromagnetic fields activate rat open field behavior.
- Davis HP et al. (1984): Behavioral studies with mice exposed to DC and 60-Hz magnetic fields.
Glossary: animals, behavioral, biological, blind study, cognitive, conditioned, endpoint, exposed, exposure, frequencies, full/main study, Hz, latency, learning, low frequency field, magnetic fields, magnetic flux density, organism, pulsed, PW, randomly, sham-exposed, significant, species, stimulus, strain, whole body exposure
Exposure: magnetic field, low frequency field, signals/pulses
© 1997 - 2014, Research Center for Bioelectromagnetic Interaction (femu - RWTH Aachen University, Germany).
The informational contents of the EMF-Portal are available free of charge for personal and strictly non-commercial purposes. The informational contents of the EMF-Portal may be retrieved, read or printed, but not (i) copied, (ii) changed or (iii) saved in any format, neither electronically nor on other storage media. Permissions for publication, reproduction, commercial purposes or third party propagation of contents of the EMF-Portal – including partial excerpts or revised formats – have to be obtained from the femu Aachen University-copyright holders. By retrieving, reading or printing these documents you expressly state your agreement with all conditions in the fine print.