Employers, the military and intelligence services may soon be using computerised mind-reading techniques and there is a need for a public debate about "mental privacy," a leading neuroscientist said yesterday. Scientists have taken MRI scanning equipment normally used in hospital diagnosis to detect lying, racism, and even identify which image a person is looking at, suggesting one could visualise scenes from a person's dreams or memory. At the Cheltenham Science Festival, backed by The Daily Telegraph, Prof Geraint Rees of University College London said that, although hospital patients and experimental volunteers are protected, there is a need for debate about, for example, whether employers could use mind reading methods to decode brain activity to screen job applicants. Another possibility raised by studies of how the brain encodes memories and other information is that these methods could be used by intelligence agencies: a suspect's brain could be interrogated against their will. "There are obvious military activities and the CIA and so on are known to be interested too." And it could be possible to reveal unconscious prejudices: a person who claims not to be a racist could be revealed to be one, if their amygdalae, almond shaped structures linked with disgust, go into action when shown a picture of a black person, raising the nightmarish possibility of interrogation for "thought crimes". Although "conceptually possible," Prof Rees says say this is currently firmly in the realm of science fiction because these mind reading methods, which typically detect tiny changes in blood flow in the brain, currently have to be adapted to each individual during hours of training while in the scanner.advertisement "You need an all purpose lie detector that would work with many people," he says. "That is quite challenge, given people's brains are different shapes and sizes, and lies come in many variations too, from my CV to how I got here.
