1. it gets bombarded by the same odor for a few minutes, after which we can't smell it anymore. receptor fatigue. a strong whiff of fresh air can clean the receptors.
2. the receptor or something higher, learns to disregard it. once it does, the odor won't be detected anymore, until a new receptor without the memory of the odor, takes its place.
Last edited by dr. d; October 22nd, 2018 at 11:46 PM.