According to one study:
“14% of pro-choice advocates say life begins when the fetus has measurable brain activity or motion.
Even among pro-choice advocates, 23% believe life begins at fertilization.
38% of pro-choice advocates believe life begins when the fetus would be able to survive outside the womb.
15% believe life begins at birth.”
“When Does Life Begin?” The Harris Poll, HarrisInteractive, February 18, 2007
]Cited in Johannah Haney The Abortion Debate: Understanding the Issues (Berkeley Heights, NJ: Enslow Publishers, Inc., 2009) 19
Brain waves have been measured in an embryo at 42 days after conception
