Questioning the ethics of computer chips that use lab-grown human neurons

A journalist asks: "What technological advance allowed such huge performance gains?" The chief executive replies: "We created a new biological chip using lab-grown human neurons. These biological chips are better than silicon chips because they can change their internal structure, adapting to a user's usage pattern and leading to huge gains in efficiency." Another journalist asks: "Aren't there ethical concerns about computers that use human brain matter?" Although the name and scenario are fictional, this is a question we have to confront now.