 Dalton continued this line of research in order to determine if it is possible to inoculate people with certain odors in order to prevent the formation of traumatic memories.She found that if you first exposed someone to a strong door in a non-threatening environment and then exposed them to the same odor in a stressful, negative context there was no association between the smell and the negative memory.Dalton's research led to the United States military changing how it trains soldiers.