Final answer:
Patient H.M. could no longer remember short-term events after having part of his medial temporal lobes, including the hippocampus, removed.
Step-by-step explanation:
Patient H.M., also known as Henry Molaison, had part of his medial temporal lobes, including the hippocampus, removed to eliminate seizures. After his surgery, H.M could no longer remember short-term events. While he was still able to recall information and events that occurred before the surgery, he lost the ability to form new memories.