中文摘要：

目的 研究860 MHz微波辐射对小鼠场景性条件恐惧（context conditioned fear）形成和消退的影响.方法 用频率为860 MHz、功率密度分别为380μW/cm2、550μW/cm2的微波辐照小鼠.辐照时间分别设定为30min和2h,因此共分成5组,每组15只动物.在暗箱内用75 V电压电击动物足部的方法 产生与之关联的场景性条件恐惧,而后观察辐照后小鼠在特定时间内出现僵立（Freezing）的时间和次数.结果 足部电击后24h时的僵立时间的值：对照组为（2.13±4.17）s,微波辐照2h的两个组分别为（3.93±6.99）s和（2.47±3.34）s,Nemenyi的检验（P=0.004）结果 ：对照组为32.63333,而微波辐照2h的两个组分别为52.46667和39.76667;僵立次数的数值：对照组为（0.73±1.16）次,微波辐照2 h的2个组分别为（0.86±1.41）次和（1.07±1.16）次,Nemenyi检验（P=0.014）结果 ：对照组为33.26667,而微波辐照2h的2个组分别为50.76667和40.90000.结论 经过相对较长时间的860MHz微波辐照的小鼠表现为对于特定的场景产生更稳固的恐惧,且难以消退.

英文摘要：

Objective To investigate the effects of 860MHz microwave on the formation and extinction of context conditioned fear in mice. Methods The mice were exposed to 860MHz continuous microwave （ power density were 380 μW/cm2 or 550 μW/cm2, respectively） for 30 min or 2 h, which then were divided in to 5 groups.Each group consisted of 15 animals. Footshocks were used to induce context conditioned fear by 75 voltages. The frequency and time of freezing after irradiation were investigated. Results When 24 h after foot shocking, the values of freezing time： control group was 2.31 ±4. 17 , two groups of the microwave irradiation 2 h were 3.93 ±6.99 and 2.47 ± 3.34, the Nemenyi test results （P = 0.004）： control group was 32.63333, while two groups of the microwave irradiation 2 h were 52.46667 and 39.76667; and the values of freezing frequency： control group was 0.73 ± 1.16 , two groups of the microwave irradiation 2 h were 0.86 ± 1.41 and 1.07 ± 1.16, the Nemenyi test results of （P=0. 014）： control group was 33. 26667, while two groups of the microwave irradiation 2 h were 50. 76667 and 40.90000. Conclusion The mice receiving relatively longer period of microwave irradiation showed more stable memory of the context conditioned fear.