The old familiar scents are suddenly gone and are replaced by unfamiliar scents and possibly those of prior pet residents. (2ndchance.info)
Your baby's olfactory survival instincts are finely tuned by around three months of age, which can explain why your baby starts to cry or become anxious when encountering strangers with an unfamiliar scent for the first time. (bounty.com)
In a modern version of Pavlov's experiment, Masmanidis and colleagues repeatedly exposed mice to the unfamiliar scent of banana or lemon, followed by a drop of condensed milk. (sciencedaily.com)