pair of Helmholtz coils with an inner diameter of 42 cm, consisting of 240 turns of insulated copper wire; coils 20 cm apart; rats placed in plastic boxes in the center of the coil system
cognitive/behavioral endpoints: situational anxiety and locomotor activity (elevated plus maze test: e.g. time/number of entries in the open/closed arm, time spent in the central part, number of rearings; novel object exploration test: approach and manipulation), social anxiety: social interaction test and territoriality test (with a strange conspecific: aggressionbehaviour (e.g. attacking, biting, defending, dominant/subordinate position)); video recording
The data show that the electromagnetic fieldexposure may influence general behavior. As for the general activity pattern (estimated in the elevated plus maze), rats seemed to become more passive right after the termination of exposure as compared to the controls. Findings of the novel object exploration test suggest that post exposure passivity remains even if the animals are motivated to explore by presenting an unfamiliar object in a familiar setting (home cage). On the other hand, neither social interactions nor territorial behaviour have changed due to the electromagnetic fieldexposure. The authors conclude that short-term exposure (20 min.) to an extremely low frequencyelectromagnetic field may not change (or at least not in the range of the applied tests) social anxiety whereas situational anxiety may increase for some extent.
Hungarian Scientific Research Fund (OTKA), Hungary
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