GearBits

Explaining the Sixth Sense?

A researcher at the University of British Columbia in Canada has reported a new mode of unconscious visual perception, which enables, for example, awareness of a change in the visual environment even without being able to identify what that change is.

Ronald Rensink showed 40 people a series of alternating images on a computer screen, each for a fraction of a second, followed by a blank screen. Sometimes the same image would remain throughout the trial; in others, the first image would alternate with a subtly different image.

Around a third of those tested reported feeling the image had changed before they could identify the change. That indicated that our visual system has the capacity to produce a strong gut feeling about a change in the environment - what might be termed a sixth sense, a belief in perceiving something when the perception has not actually occurred yet.

What the researchers are now calling mindsight may also behind that feeling of going into a room and sensing something is different but not being able to put your finger on it. "It could well be an alerting system," says Rensick. Sensing someone is following you may be the auditory equivalent of mindsight.

"I think this effect explains a lot of the belief in a sixth sense," says Rensink. Researchers still have no idea what physical processes are behind this phenomenon.