Abstract
BACKGROUND: Previous studies shown that mobile phone can impairment of working memory in humans. OBJECTIVE: In this study, the effect of radiofrequency radiation emitted from common mobile jammers have been studied on the learning and memory of rats. MATERIAL AND METHODS: In this prospective study, 90 Sprague-Dawley rats, were divided into 9 groups (N=10): Control, Sham(1st) (exposed to a switched-off mobile jammer device at a distance of 50 or 100 cm/1 day, 2 hours), Sham(2nd) (similar to Sham(1st), but for 14 days, 2 h/day), Experimental(1st) -50 cm/1 day &100 cm/1 day (exposed to a switched-on device at a distance of 50 or 100 cm for 2 hours), Experimental(2nd) (similar to experimental(1st), but for 14 days, 2 h/day). The animals were tested for learning and memory the next day, by the shuttle box. The time that a rat took to enter the dark part was considered as memory. RESULTS: Mean short-term memory was shorter in the experimental- 50 cm/1 day than control and sham- 50 cm/1 day (P=0.034), long-term memory was similar. Mean short- and long-term memory were similar in the experimental- 100 cm/1 day, control and sham- 100 cm/1 day (P>0.05). Mean short-term memory was similar in experimental- 50 cm/14 days, control, and sham- 50 cm/14 days (P=0.087), but long-term learning memory was shorter in the radiated group (P=0.038). Mean short- and long-term were similar among experimental-100 cm/14 days, control or sham 100 cm/14 days (P>0.05). CONCLUSION: Rats exposed to jammer device showed dysfunction in short- and long-term memory, which shown the unfavorable effect of jammer on memory and learning. Our results indicated that the distance from radiation source was more important than the duration.