Effects of two frequencies infrasound exposure on auditory threshold in guinea pigs

Objective To study the changes of the auditory threshold after two frequencies infrasound exposure in guinea pigs.Methods The electron was inserted into Fallopian′s canal of guinea pigs for a long time during the(experiment.) The auditory thresholds in 40 awake guinea pigs exposed to infrasound with various frequencies and(intensity) were observed systematically.Results The permanent threshold shifting(PTS) was caused after 8 Hz and 12 Hz 130 dB infrasound exposure for 30 h and temporary threshold shifting(TTS) was caused after 120 dB infrasourd exposure for 30 h.Conclusion The Ap(N_1) threshold is damaged permanently after 130 dB infrasound exposure.