A human fetus is unlikely to feel pain before the third trimester, when consciousness begins to form, researchers from UCSF said on Tuesday in a report that could fuel debate over proposed US abortion legislation.人类胎儿是不会感到痛苦之前，孕晚期时，意识开始形成，研究人员从ucsf说，周二在一份报告中指出，燃料可辩论的建议，美国的堕胎立法。

Legislation under consideration by the US Congress and some US states would require doctors to inform women seeking abortions after the 22nd week of gestation that their fetus feels pain and offer to anesthetize the fetus.正在审议的法例，由美国国会和美国的一些国家将需要医生告知妇女寻求堕胎后，第二十二周妊娠胎儿，他们觉得痛苦和提供麻醉胎儿。

Supporters of the legislation say that when a fetus displays a withdrawal reflex or hormonal stress response, that is evidence of fetal pain.支持者法例指出，当胎儿显示撤回反射或内分泌应激反应，这证明胎儿的痛苦。 But the researchers at the University of California, San Francisco, questioned that view, saying the responses may be automatic and not signs of discomfort.但研究人员在加州大学，旧金山，质疑这种看法，说的回应，可能会自动和不舒服的迹象。

Drawing on findings from thousands of medical-journal articles on the subject of fetal pain and related topics, the report’s author, Susan Lee, wrote that “pain is a subjective sensory and emotional experience that requires the presence of consciousness.”绘画的结果，从数以千计的医学期刊文章就此事对胎儿的痛苦和相关主题，报告的作者，苏珊李，写道： “疼痛是一种主观感觉和情感体验，需要在场的意识” 。

Consciousness is created by brain connections between the thalamus and the cerebral cortex, and those do not begin to develop before the 23rd week and possibly not before the 30th week of gestation.意识是创造的脑之间的联系，丘脑和大脑皮质，和那些不开始发展之前，第二十三周，并可能不前， 30周妊娠。 The human gestation period is 38 weeks from conception.人类的怀孕期是38周从构思。

“ Conscious perception of pain does not begin before the third trimester ,” Lee wrote. “ 自觉的观感疼痛不开始前，孕晚期 ， ”李写道。 In the United States, only 1.4 percent of abortions are performed at or after 21 weeks gestational age, the report said.在美国，只有1.4 ％的堕胎是表现在或后21周胎龄，报告说。

Dr. Wendy Chavkin of Physicians for Reproductive Choice, and Health, commenting on the report, said its conclusions affirmed what other experts have found, and denounced the proposed legislation concerning fetal pain - “These laws have nothing to do with pain or pain reduction, but are clearly intended to stigmatize abortion, the women who have abortions and the doctors who provide them,” she said.博士温迪chavkin医师为生殖选择和健康，在评论该报告时说，其结论肯定有什么其他专家发现，并谴责建议的法例有关胎儿疼痛-“这些法律并不疼痛或疼痛减少，但显然是有意诬蔑堕胎，妇女有堕胎的谁和谁的医生为他们提供， “她说。

Source:资料来源： Reuters路透社