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The devices intercept the signals travelling on the axons, or nerve fibres, of the spinal cord, allowing the signals to be recorded.

Researchers have developed tiny, flexible devices that can wrap around individual nerve fibres without damaging them.

Patients suffer because their immune system is attacking their own nerve fibres, which inhibits the transmission of nerve signals.

However, it is very difficult to correctly determine the direction of nerve fibres at the crossing points of nerve fibre bundles, as nerve fibres with different directions overlap there.

These protective sheaths insulate the nerve fibres, much like the plastic coating around a copper wire.