2. Chemical Senses-Smell Macrosmatic (Dog) vs Dogs are 300 to 10K more sensitive (e.g. bomb, cadaver, fish, drug detecting dogs) Microsmatic (Human) Sensitivity varies w the number of receptors not sensitivity of individual receptors (10 million in humans vs 1 billion in dogs) Anosmia

6. Chemical Senses-Smell Receptors

9. Chemical Senses-Smell Receptors

13. Chemical Senses-Smell Response of Olfactory Bulb to different substances There is a position associated with each substance

16. Chemical Senses-Smell Smell Naming and Memory The perception of a particular smell is influenced by memory associations for the name of the smell. If a subject is given an ambiguous smell stimulus and told it is smell X, then the subject will perceive the smell as X.

17. Chemical Senses-Smell Identifying others by smell Humans can generally identify males vs females by smell alone. This works for body and breath odor. Women who synchronize the menstrual cycle likely do this using smell.