The amygdala and the sense of smell.
D000679:Amygdala / Q000033:anatomy & histology / Q000502:physiology*; D000818:Animals; D000882:Haplorhini; D008032:Limbic System / Q000033:anatomy & histology / Q000502:physiology; D009832:Olfactory Nerve / Q000033:anatomy & histology; D012903:Smell; D013788:Thalamus / Q000033:anatomy & histology