32 pre-trained rats were divided into an exposure group and a control group. Three rats from each group were implanted electrode arrays in their hippocampal CA1 regions, but neuron signals from only one exposed rat in 9 weeks and one control rat in 8 weeks were recorded because electrode arrays fell off or rats bit off cables.
Rats were exposed from Monday to Friday and tests were performed on Saturday.
Exposure duration: continuous for 2 x 3 h/day (6 h/day), 5 days/week, 10 weeks
|Exposure duration||continuous for 2 x 3 h/day (6 h/day), 5 days/week, 10 weeks|
|power density||10 W/m²||-||-||-||near the center of the four cages|
The data showed that during the weeks 4-5 of the experiment, the average completion time and error rate of the exposure group were longer and larger than that of the control group, i.e. compared with the control group, the exposed animals spent more time in the maze and made more mistakes during weeks 4-5.
The hippocampal neurons showed irregular firing patterns and more spikes with a shorter interspike interval for both the exposure and the control group during the whole experiment period.
The findings indicate that the 916 MHz electromagnetic field exposure influence learning and memory in rats to some extent at a specific exposure time point and that the rats can adapt to long-term electromagnetic field exposure.