In ID: the Quest for Meaning in the 21st Century, Susan Greenfield, Professor of Pharmacology at Oxford, describes a startling range of neurological possibilities: devices enabling paraplegics to activate prosthetic limbs by thought alone, and marrying brain cells with silicon chips.

Further in the future, she envisages reverse cochlear implants that can not only turn sound into brain waves but also the reverse. Fitted with tiny radios, these open up the amazing possibility of directly transmitting thought from brain to brain.