Professor Chris French, of London's Goldsmith's college - a specialist in investigating paranormal beliefs and "experiences" - says mind-reading is the stuff of fantasy.
"If Derren Brown really has successfully developed techniques to discern the contents of people's minds in the way that he claims, he has single-handedly achieved more than the collective attempts of psychologists over many decades."
He says the stunt may have more in common with the "cold reading" techniques typically associated with psychics and mediums.