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Transcranical Magnetic Stimulation (TMS) uses a week electric current to knock out the activity of certain parts of the brain. In this clip Professor Vincent Walsh uses TMS to interfere with Michael鈥檚 ability to move and talk.

He meets remarkable individuals like Karen, who suffered from a rare condition - alien hand syndrome - which meant that one of her hands constantly attacked her. And Julia, who seems to have recovered from her stroke - until experiments reveal she is unable to recall the name of any object.

Michael explores the case of an amnesiac known for years only by his initials, HM, who became the most studied individual in the history of psychology and whose extraordinary case opened a window on how our memory works. He visits the multi-million dollar centre which has been set up since HM died to map his unique brain down to the level of an individual neuron.