Our sense of smell is directly linked to the part of our brain which influences our memory, decision-making and emotional reactions. This is directly connected to other parts of the brain that control heart rate, blood pressure, breathing, memory, stress levels, hormone balance and can therefore stimulate an automatic physiological and psychological response (almost completely beyond our control). AROMATHERAPY uses fragrances to affect or alter a person’s mood or behavior. What oil you choose to DIFFUSE would depend on your needs and emotional requirements.