When would that be?
Brainwaves have been measured at 43 days after conception. Brainwaves cannot exist without a complex network of "connected nerve cells" to produce them. Such a network would've had to begin assembling long before 43 days for it to be operating AT 43 days.
So at what point do you assert that there are no "connected nerve cells"? At conception?
Not that it's a terrible crucial point, but yes, there are no nerve cells at conception--that is what the hubbub about stem cell research is about. There are only stem cells at conception.
I do not agree that this should be the compelling criteria, I was just citing a particular issue, but if you think it is, than do you concur that a child may be aborted before it's 43rd day?