Olfaction plays a key role in guiding the behavior of most animal species Compared with our knowledge on sensory processing in other sensory systems such as visual and auditory systems,however, olfactory coding and perception is far from being understood.▪ Olfaction plays a key role in guiding the behavior of most animal species. ▪ Compared with our knowledge on sensory processing in other sensory systems such as visual and auditory systems, however, olfactory coding and perception is far from being understood