We have all grown up believing that, although our physical behaviour can easily be constrained and dominated by others, our minds, thoughts, beliefs and convictions are to a great extent beyond external constraint. As John Milton said "Thou canst not touch the freedom of my mind". But advances in neural engineering, brain imaging and neuro-technology mean that the mind may soon not be such an unassailable fortress. Elon Musk and others are developing tools such as

This suggests that we will, at the very least, require improvements to laws around data analysis and collection. But some scientists argue that human rights law will need to be updated to take into account the ability of governments not only to peer into people's minds but also alter them.

Martin Stanley

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