Past events leave unique “memory traces” in the hippocampus of the brain that can be distinguished from one another in fMRI brain scans, a study at the Wellcome Trust Centre for Neuroimaging at University College London has found.

While inside an fMRI scanner, volunteers were asked to recall each of three films they had just seen. A computer algorithm then identified which film the volunteer was recalling purely by looking at the pattern of their brain activity.

More info: Wellcome Trust Centre for Neuroimaging