Wen explains that aromas can directly enter the brain's "peripheral system." This area of the brain not only has the hypothalamus that controls pituitary hormones, it also controls mood. Therefore, the most direct method is to use fragrances to affect the operations of the brain.
她解釋，氣味能直接進入大腦的「邊緣系統」，這塊區域除有控制腦下腺荷爾蒙的下視丘，也同時管理人的情緒，因此透過嗅覺來影響腦運作，是最直接的方式。