Can I smell better than my dog? Among the five senses, the sense of smell is the most underestimated. Yet, it has the greatest influence on our emotions and controls our behavior more than we realize. Neuroscientist and scent researcher Johannes Frasnelli explains why we can smell much better than we think and what the latest findings in scent research have to do with our everyday lives. For instance, why we can literally smell someone well, what scent training does to our brain, how fears and depression alter our sense of smell, and what the loss of the sense of smell has to do with Alzheimer’s.