A therapeutic brain-computer interface is a BCI whose purpose is to restore conditions of actualization lost through illness. The paradigmatic use case: a patient with amyotrophic lateral sclerosis (ALS) in a completely locked-in state (CLIS), for whom no communication would otherwise be possible without the BCI; a tetraplegic patient to whom the BCI gives back computer use, smart-home control, and thereby social participation; a patient with spinal-cord paralysis for whom a BCI enables motor restitution.
In terms of the ontology of personhood, this application is restitution, not extension. The BCI does not create personhood and is also not a precondition for dignity — the person of a completely locked-in ALS patient is fully given before and without the BCI. The BCI restitutes the conditions of manifestation: the possibility of being heard, of entering into communicative relation with others, of carrying out actions.
Ontological classification: Superordinate concept: Brain-Computer Interface; disjoint with: Enhancement BCI.
The ethical dividing line
The central distinction is healing versus self-deification. Therapeutic BCI serves the restoration of the species-typical normal enactment of a bearer of intelligence. It does not replace faculties, but restitutes possibilities of actualization that are impaired by illness or injury. It is in this respect structurally analogous to reading glasses, hearing aids, wheelchairs, and cochlear implants — tools of restitution, not of essence-change.
The bioethics literature of 2025 (Voices in Bioethics, Frontiers in Human Neuroscience, Dignitas) converges on the position that in this mode of use BCIs restitute the practical conditions under which communicative agency and personal participation can be exercised at all (so, for instance, Gruica 2025). It is also magisterially connectable: Pope Leo XIV, in his message to the Pontifical Academy for Life “AI and Medicine: The Challenge of Human Dignity” (dated 7 November 2025, congress 10—12 November 2025), assessed the therapeutic application positively, without blurring the differentiation from the enhancement application.
The case of ALS — communicative life-preservation
For completely locked-in ALS patients, the BCI is not comfort, but communicative life-preservation in the personalist sense. It preserves the condition of the possibility of being heard — and thereby the condition of the possibility of being present in a personal community. The address that constitutes every person can be answered only if a channel of communication exists. When the biological channel fails, technical restitution is an act of respect for the person, not of manipulation.
Methodological note
The term “therapeutic” is here strictly conceived as restitutive, not therapeutic in the broader sense (wellness, preventive optimization). A healthy person who has a BCI implanted in order to work faster does not fall under “therapeutic BCI,” even if a provider markets it that way. The dividing line is the indication of illness or injury, not the marketing label.
Sources: Generated by querying the Personhood ontology. Research as of 7 June 2026 (dossier HCI / BCI — Worldwide Research).
Further sources:
- Gruica, Toma (2025): The Ethical Significance of Brain-Computer Interfaces as Enablers of Communication. Voices in Bioethics 11.
- Center for Bioethics and Human Dignity (2025): Brain-Computer Interface Technology’s Impact on Human Personhood, Identity, and Dignity. Dignitas 32 (3-4).
- Wilkins, R. Bert; Coffin, Tara; Pham, Michelle; Klein, Eran; Marathe, Megh (2025): Mind the gap: bridging ethical considerations and regulatory oversight in implantable BCI human subjects research. Frontiers in Human Neuroscience 19.
- Pontifical Academy for Life (2025): AI and Medicine: The Challenge of Human Dignity. International Congress 10—12 November 2025; Message of Pope Leo XIV of 7 November 2025.