Beth Revis said this quote

Mom used to say that the thoughts in our heads were nothing more than electrical impulses. I remember Dad and her talking about this over dinner. It frustrated Dad that the human brain can fire electrical sparks and think, but that the electricity he’d pump into an android brain would never give it independent thought. The body isn’t that different from a machine. Humans and androids both run on electricity.That lightning spark of energy I saw in the reverie.That was my mother’s last thought, an echo of electricity, something that sparked when I entered her dreamscape.That spark is gone now. Her life is gone now. Everything that made her, her, is gone now. Faded into nothing.