Final answer:
Henry Molaison, also known as H.M., experienced damage to his medial temporal lobes due to a lobectomy surgery performed to alleviate his epilepsy. This resulted in anterograde amnesia, where he was unable to form new memories.
Step-by-step explanation:
H.M., also known as Henry Molaison, underwent a bilateral lobectomy in 1953 to alleviate his epilepsy. Unfortunately, this surgery resulted in damage to his medial temporal lobes, specifically the hippocampus and amygdala. This caused a condition known as anterograde amnesia, where H.M. was unable to form new memories. He could recall events prior to the surgery but had difficulty forming new episodic memories.