So, my setting is a post apocalyptic one, 197 years after WW3 kicked off and destroyed pretty much everything. The current date is 2259. Before WW3 started, the USA was experimenting heavily with robotic machinery and engineering. Dr. Erwin Joshua proposed a new idea, however. Instead of using actual computer systems and etc. to create AI, use human brains, encased inside of robotic bodies.
Around that time, Daniel Tyson, infamous serial killer, was executed. Since he obviously wouldn’t be missed, Joshua and his team took his brain, and preserved it. Than, after building a robotic body, they hooked up his brain to the robotic body. But, Tyson doesn’t keep any of the memories from his human days. Many more executed criminals undergo the same process, same story for them.
My question is, what would be a logical reason why Tyson, and all other Brainbots produced do not keep their old memories after being revived?