Brain life and brain death: a proposal for a normative agreement

Area of Science:

• Neuroscience
• Bioethics
• Developmental Biology

Background:

• The definition of brain death established a normative consensus for end-of-life moral and legal considerations.
• Current ethical debates on embryonal life lack a similar consensus based on biological markers.

Purpose of the Study:

• To review the moral and cultural assessments leading to the definition of brain death.
• To propose a framework for the moral recognition and legal protection of embryonal life based on brain development criteria.
• To establish a normative consensus for early human life protection.

Main Methods:

• Review of historical and philosophical literature on brain death.
• Differentiation of early human embryonal brain development into distinct stages (cortical brain life I and II).
• Comparative analysis of ethical principles applied to brain death and embryonal life.

Main Results:

• Cortical brain life I, marked by the first post-mitotic stationary neurons, occurs around the 54th day post conception.
• Cortical brain life II, characterized by neuro-neuronal synapses, begins after the 70th day post conception.
• The 54th day post conception is proposed as a tentative threshold for moral recognition of embryonal life.

Conclusions:

• A normative consensus for the moral recognition of embryonal life can be informed by criteria of brain life, similar to brain death.
• Embryo research may be acceptable before the 54th day post conception, aligning with principles used for brain death.
• Developmental stages like fertilization, nidation, viability, and potentiality are less significant for early human life's moral recognition than brain development.