A STUDY ON MEMORY RESPONSE OF MICE TO EARTHQUAKE PREMONITORY GEOSOUND

In this paper, comparative studies on the memory responses of white mice to earthquake premonitory thunders with a main peak frequency of 200 Hz and to pink noise are given. The results show that white mice not only can obviously form memory response to geo-sound signals but the sensibility of trained mice to this kind of geo-sound signals is markedly imporv-cd.1. In geo-sound group (Gs. G.) and noise group (N. G.), the time-intensity curve (TIC) of pass-door reactions both approximate to an exponential altenuation, and the peak intensity within the range of periods of 1-5s (SPL 10 dB) is 0.71 and 0.40, respectively. In control observations (Con.), the TIC approximates to a normal distribution of stochastic events, and rhe reaction intensity within the periods of 1-5s is only 0.13, its peak intensity within the range of periods of 11-15s is 0.32.2. In the Gs. G., the latency of pass-door responses to the geo-sound signal at lOdB is on an average 2450.5s, that is, it is on an average 0.86s shorter than that the N. G.; and to the geo-sound signal at 10-30 dB is shorter than the N. G. by about 2s.3. In the Gs. G., the collective effects of pass-door reaction are obvoiusly improved and the ratio of pass-door rection by the groups of three and four mice is 1.6 and 2.9 times of the Con., respectively.4. In test animals of the Gs. G., the TIC responding to a tone of 250 Hz still approximates to response to geo-sound signal, but the response to the pink noise obviously loses the original reaction properties.