Researchers have identified two types of cells in our brains that are involved in organising discrete memories based on when they occurred. This study, led by Dr Ueli Rutishauser, professor of neurosurgery, neurology and biomedical sciences at Cedars-Sinai Medical Center, Los Angeles, and published in Nature Neuroscience, uncovered how the human brain separates, stores, and retrieves memories by identifying brain cells that form boundaries between discrete events. This finding improves our understanding of how the human brain forms memories and could have implications in memory disorders such as Alzheimer’s disease.