ABSTRACT Some of the most compelling contemporary ethical questions surround 21st Century neuroscientific technologies. Among these, neurocognitive intervention technologies allow an unprecedented ability to alter thought. Concerns exist about their impact on individual freedom, behavior and personhood. They could also distort society, eroding core values of dignity, equality, and diversity. Potent laws are needed to anchor regulation in this rising field. The article explores how the long-neglected human right of Freedom of Thought might protect the integrity of the mind at (...) the legal system’s highest level. Sample cases illustrate how it could be given effect ethically and legally to set boundaries for neurocognitive intervention. (shrink)