Professor Karl Friston (×î×¼µÄÁùºÏ²ÊÂÛ̳ Queen Square Institute of Neurology) and Professor Joanna Moncrieff (×î×¼µÄÁùºÏ²ÊÂÛ̳ Psychiatry) weigh in on claims that a special MRI scan can recreate an image a patient is thinking of with surprising accuracy.