For most of human history, the mind was inviolable by law because it was inviolable by technology. No instrument could read thoughts, extract memories, or decode the neural patterns that constitute inner experience. Legal systems therefore developed frameworks for protecting the body, speech, correspondence, and property — but not cognition itself, because cognitive intrusion was either impossible or confined to coercive interrogation methods so crude that their products were legally and epistemically worthless. That historical immunity is ending. Neurotechnology — spanning functional neuroimaging, electroencephalography, implanted neural interfaces, and machine-learning decoders trained on neural signals — is progressively dissolving the boundary between the inner life and the world outside the skull. The right to mental privacy, and the broader concept of neuro-rights, emerges as the collective response to this dissolution.

At collective scale, the stakes of mental privacy extend far beyond individual cases of neural data misuse. When the inner life becomes legible to external readers — whether employers, governments, insurers, advertisers, or security services — the social calculus of power shifts fundamentally. Democratic participation depends on the secrecy of the ballot and the freedom to form political opinions without surveillance. The privacy of conscience — the ability to hold heterodox beliefs, explore morally complex ideas, or experience doubt without those processes being monitored and judged — is a structural precondition for the kind of pluralism that sustains free societies. If neural legibility becomes widespread and unregulated, these structural conditions erode regardless of any individual's willingness to share their neural data voluntarily.

The neuro-rights framework, developed most systematically by neuroscientist Rafael Yuste and colleagues, proposes that existing human rights frameworks must be extended to cover five domains: mental privacy, personal identity, free will, mental integrity, and equal access to cognitive enhancement. Each reflects a distinct dimension of the threat posed by neurotechnology to the conditions of autonomous selfhood. Mental privacy is the threshold right, because without it the others become difficult to secure: if neural states can be read without consent, identity can be manipulated, free will can be undermined by neural nudging, mental integrity can be violated by unwanted modification, and access inequalities can compound as those who cannot afford protective measures become cognitively legible to those who can.

The stewardship challenge for collective governance is to develop legal frameworks that protect these interests without prohibiting the therapeutic and scientific uses of neurotechnology that offer genuine benefits. Neurotechnological interventions — deep brain stimulation for Parkinson's disease, cochlear implants, emerging treatments for depression and PTSD — require neural data and neural access. The governance task is therefore not prohibition but boundary-setting: defining what uses of neural access are legitimate, what consent requirements attach to each, what data protections must accompany neural recording, and what remedies exist for violations.

Chile led the world in 2021 by enacting a constitutional amendment protecting "neuro rights," including mental integrity and the inviolability of neural information. Other jurisdictions — including the state of Colorado and several European countries — have followed with targeted neural data protection statutes. International human rights frameworks have not yet fully incorporated neuro-rights, though the UNESCO Recommendation on the Ethics of Artificial Intelligence gestures in this direction. The trajectory is toward increasing specificity, but the pace of legislative development remains slower than the pace of technical capability.

The collective planning dimension of Law 4 requires societies to anticipate the regulatory challenges that will arise not from current neurotechnology but from the systems being developed now. Consumer neurotechnology — EEG headsets marketed for wellness, focus enhancement, or gaming — is already generating large neural datasets outside the clinical context, with privacy protections far weaker than those governing medical devices. The aggregation problem means that datasets individually insufficient for meaningful neural decoding can, when combined, enable inference about emotional states, political attitudes, and susceptibility to manipulation. Planning for this trajectory requires regulatory foresight: designing governance frameworks now that can scale as technical capabilities increase, rather than waiting for demonstrable harms to accumulate.

Law 0 grounds the neuro-rights case in its most fundamental terms: the mind is not merely an organ of the self; it is the self in its most irreducible sense. To permit unrestricted neural surveillance is to permit a form of domination that reaches deeper than any previously existing technology has allowed. The integrity of the inner life — including its opacity to external observation — is not a preference but a precondition for the kind of selfhood that makes social membership, moral agency, and political participation meaningful. Societies that fail to protect mental privacy at collective scale are not merely permitting individual privacy violations; they are undermining the existential conditions of the personhood they presuppose in their legal and political systems.

Law 2 connects neuro-rights to systemic resilience: a society in which mental states are routinely surveilled and potentially manipulated is a society systematically less capable of the authentic deliberation, coalition formation, and adaptive response that resilience requires. Cognitive sovereignty — the capacity of individuals and communities to think, deliberate, and choose without external intrusion — is a collective resource as much as an individual one. Its erosion does not merely harm specific individuals; it degrades the social and political capacities of the whole.