A new computer algorithm can successfully record a person's memory just by looking at their brain activity, reveals a study.

In the study, researchers at the Wellcome Trust Centre for Neuroimaging at University College London (UCL) looked at a person's brain activity and predicted which of three short films he or she was thinking about.

Led by Professor Eleanor Maguire, the study goes a step ahead of a pervious study, which showed how spatial memories - in that case, where a volunteer was standing in a virtual reality room - are recorded in regular patterns of activity in the hippocampus, the area of the brain responsible for learning and memory.

"In our previous experiment, we were looking at basic memories, at someone's location in an environment. What is more interesting is to look at 'episodic' memories - the complex, everyday memories that include much more information on where we are, what we are doing and how we feel," said Maguire.

To explore how such memories are recorded, the team showed ten volunteers three short films and asked them to memorise what they saw.

The volunteers were then asked to recall each of the films in turn whilst inside an fMRI scanner, which records brain activity by measuring changes in blood flow within the brain.

A computer algorithm then studied the patterns and had to identify which film the volunteer was recalling purely by looking at the pattern of their brain activity.

"The algorithm was able to predict correctly which of the three films the volunteer was recalling significantly above what would be expected by chance. This suggests that our memories are recorded in a regular pattern," explained Martin Chadwick, lead author of the study.

Although a whole network of brain areas support memory, the researchers focused their study on the medial temporal lobe, an area deep within the brain believed to be most heavily involved in episodic memory.

It includes the hippocampus - an area studied extensively in the past.

The researchers found that the key areas involved in recording the memories were the hippocampus and its immediate neighbours.

However, the computer algorithm performed best when analysing activity in the hippocampus itself, suggesting that this is the most important region for recording episodic memories. In particular, three areas of the hippocampus - the rear right and the front left and front right areas - seemed to be involved consistently across all participants.

The rear right area had been implicated in the earlier study, further enforcing the idea that this is where spatial information is recorded.

However, it is still not clear what role the front two regions play.

"Now that we are developing a clearer picture of how our memories are stored, we hope to examine how they are affected by time, the ageing process and by brain injury," said Maguire.

The results are published in the journal Current Biology. (ANI)