The other is aimed at the fetus, which directly stimulates the fetal brain through sound signals, improves the development level of fetal brain cells and promotes the intellectual development of the fetus. Physiological research shows that the fetus has its first "hearing" within 16 weeks. But at this time, hearing is vibrated by sound through the skin, bones and vestibular system, and the fetus cannot understand it as a sound signal. It is not until 2 1 week that the fetus can respond to the surrounding sounds.
Studies have shown that when the mother speaks, the fetal heart rate slows down, and the fetus can not only hear but also recognize the mother's voice. The 6-month-old premature baby has responded to the surrounding sounds. Many pregnant women say that if the door is slammed or the car backfires, the fetus in the stomach will exercise violently. Even if there is no external influence, the matrix is not a quiet world. The researchers inserted hydrophones into the uterus of pregnant women and detected horizontal noise similar to the background noise of apartments.
In fact, the sound in the uterus can reach 85 decibels, including the sound of blood flowing in the mother's blood vessels, the sound of gastrointestinal peristalsis, the sound of the mother passing through tissues, bones and body fluids, and the sound of others entering through the amniotic membrane. The development level of the fetus can't really understand the sound signal, but only remember its rhythm characteristics and timbre. Nevertheless, this kind of memory needs the rhythm of the sound to be simple enough and repetitive enough. If you have a better idea, please leave a message in the comments section. Thank you for your support and attention!