We often think of memory as a record of facts, but it is also a web of sensations and emotions—and a vehicle for traveling, so to speak, through time. This program explores the mechanisms of human recollection, presenting new case studies and medical findings that reveal the complexity of the brain’s memory center. Harvard psychiatrist Dr. Randy Buckner explains his research into memory functions and Alzheimer’s disease. Dr. Faraneh Vargha-Khadem of University College London discusses her work with a 30-year-old man who, due to hippocampal damage, has almost no memory capacity. And Dr. Alain Brunet of McGill University explains recent trials of propanolol as a treatment for Post-Traumatic Stress Disorder. A BBC Production. (50 minutes)