Researchers develop new method for studying ‘mental time travel’

December 23, 2005 | Source: KurzweilAI

Neuroscientists at Princeton University have developed a new way of tracking people’s mental state as they think back to previous events — a process that has been described as “mental time travel.”

The findings, detailed in the Dec. 23 issue of Science, will aid efforts to learn more about how people mine the recesses of memory and could have a wide-ranging impact in the field of neuroscience, including studies of brain disorders such as Alzheimer’s disease.

The researchers showed nine participants a series of pictures and then asked them to recall what they had seen. By applying a computerized pattern-recognition program to brain scanning data, the researchers were able to show that the participants’ brain state gradually aligned with their brain state from when they first studied the pictures. This supports the theory that memory retrieval is a form of mental time travel.

In addition, by measuring second-by-second changes in how well participants were recapturing their previous brain state, the researchers were able to predict what kind of item the subjects would recall next, several seconds before they actually remembered that item.

Source: Princeton University news release