Henry Molaison (HM)

Henry Molaison, known as HM, was a man who underwent a brain surgery in 1953 to treat severe epilepsy. The surgery removed parts of his medial temporal lobes, which resulted in profound memory loss. Although he could remember events from before the surgery, he was unable to form new long-term memories, creating a condition called anterograde amnesia. HM's case became crucial for understanding memory, revealing the specific regions of the brain involved in memory formation. His life and condition helped neuroscientists explore the complexities of memory and its various types, significantly advancing the field of psychology and neuroscience.