This article investigates a critical yet underexplored structural aspect of consciousness in the context of the practical ethics of neural organoid research: the unity of consciousness. We advocate for the necessity of the unified field, which has garnered substantial support from both philosophical and empirical standpoints, although the debate remains unresolved. We highlight the brainstem as a potential source of the unified conscious field, a structure already under scrutiny in neural organoid research in relation to conditions such as Parkinson’s disease (...) and post-COVID-19 syndromes. We argue that if unity is a necessary feature of consciousness, consciousness is contingent upon a specific biological system without which consciousness cannot arise, thereby narrowing the range of neural organoids of ethical concern. Furthermore, the transplantation of neural organoids into animals has emerged as a practical concern, with ethical implications varying based on the necessity of the unity of consciousness. We argue that transplantation evades a significant ethical dilemma if unity is necessary and if the organoids to be transplanted lack the neural basis for the unified field of consciousness. (shrink)