Vince M A, Armitage S E
Reprod Nutr Dev (1980). 1980;20(3B):801-6. doi: 10.1051/rnd:19800506.
Work on the uterine sound environment has been carried out by implanting a hydrophone on the neck of the foetus in two pregnant ewes a few weeks before term. Stimulation with sounds of known amplitude and the use of calibrated microphones and a frequency analyser enabled us to assess (1) the amount of attenuation of sounds of different frequency when they had passed through the maternal tissues and amniotic fluid to become available to the foetus, (2) the absolute level of sound entering the amnion from within the mother and (3) the recognizability of external sound such as speech, when recorded from within the uterus. One puzzling feature of the results has been our inability to hear those sounds which are commonly believed to constitute a predominant stimulus for the foetus: those produced by the maternal cardiovascular system.
通过在两只孕羊接近足月前几周将水听器植入胎儿颈部，对子宫声学环境进行了研究。用已知振幅的声音进行刺激，并使用校准过的麦克风和频率分析仪，使我们能够评估：（1）不同频率的声音在穿过母体组织和羊水到达胎儿时的衰减量；（2）从母亲体内进入羊膜的声音的绝对水平；（3）当从子宫内记录时，诸如语音等外部声音的可识别性。研究结果中一个令人困惑的特点是，我们无法听到那些通常被认为是胎儿主要刺激源的声音：即由母体心血管系统产生的声音。
