When a man arrived in the middle of the night at a North London hospital and was emotionally upset, distressed, with seizure-like movements and unable to speak, Isabel Straw, an NHS emergency doctor, first struggled to find the reason because all the tests her team performed on him did not reveal any issues. That is until she realized the man had a brain stimulator implanted inside his head and its malfunctioning was probably the reason for his pain.

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