Originally Posted by GarfieldJL
Actually they have a brain, as PastramiX also stated. You can't have brainwave signals without a brain, and embryos do give off brainwave signals.
The main problem with your statement here is that it is completely uninformed and wrong.
Brain development doesn't occur to anything functional until about 4-5 weeks and doesn't present gyri and sulci until about 7 months (Kolb & Whishaw 2008: 657). Embryonic stem cells are harvested at the blastocyst stage while their at there most pluripotent potential (Reubinoff et al 2000).
There is are no brainwaves for the embryos being harvested at the blastocyst stage.
Kolb, Brian and Ian Whishaw (2008). Fundamentals of Human Neuropsychology.
Macmillan: New York
Reubinoff, Benjamin E.; et al (2000). Embryonic stem cell lines from human blastocysts: somatic differentiation in vitro. Nature Biotechnology
, 18, 399-404.