en Radiation Biology Radiation Biology تحقيق بديع Original Research <strong>Introduction:</strong> Over the last decade, exposure to non-ionizing electromagnetic waves due to base station antenna has increased. This<em> in vivo</em> study was planned for evaluating the effects of whole-body exposure to 950 MHz field of GSM mobile phone system on rat dentate gyrus long-term potentiation. <strong>Materials and Methods:</strong> 24 naive male Wistar rats (3 month old, 225|¡|25 g) were randomly divided in the three groups (sham-exposed, GSM and continuous field exposed). The exposure program was planned for 10 sessions at 3 days. Animals were exposed to electromagnetic field for 45 minutes in a circular plastic chamber (mean power density=0.835 mW/cm2). Immediately after end exposure, anesthesia was induced for long term potentiation (LTP) induction. Field potentials were recorded and analyzed using the population spike amplitude and EPSP slope for 60- min. <strong>Results:</strong> There were no significant differences in population spike amplitude, EPSP slope and EPSP slope maintenance among the three groups. <strong>Conclusion:</strong> This study provides no evidence indicating that long-term potentiation can be affected by the whole-body exposure to low-power density of 950 MHz field of GSM mobile phone system. Electromagnetic field, base station, long-term potentiation, dentate gyrus, rat. 119 124 http://ijrr.com/browse.php?a_code=A-10-1-245&slc_lang=en&sid=1 M. Jadidi 79003194753284600836 79003194753284600836 No S.M.P. Firoozabadi pourmir@modares.ac.ir 79003194753284600837 79003194753284600837 Yes A. Rashidy-Pour 79003194753284600838 79003194753284600838 No B. Bolouri 79003194753284600839 79003194753284600839 No Y. Fathollahi 79003194753284600840 79003194753284600840 No