Having successfully used them to reduce seizures in psychotics, Scoville decided to remove  H.M.'s hippocampus, a part of the limbic system that was associated with emotion but whose function was unknown.
Tendo-as usado de forma bem sucedida para reduzir as convulsões em pacientes psicóticos, Scoville decidiu remover o hipocampo de H.M., uma parte do sistema límbico associado à emoção, mas cuja função era desconhecida.