For example you open a new air freshener and you smell it and it lasts for a few days but does your nose ‘get used’ to the fragrance and you stop smelling it?
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The way it was described to me is that the brain is a “difference engine”. It works, in part, by recognizing when things in our environment change.
Sense of smell in the wild is a survival sense. It can lead you to food, or it can warn you of danger. If you’re out meandering the wild and come across the rotting carcass of an animal, that’s going to be a pretty strong scent. And if your brain wasn’t able to filter it out after a short while, any sufficiently strong scent would be enough to defeat your sense of smell’s ability to inform you about your environment.
In other words, if you rely on scent to survive, having your sense of smell defeated by strong odors is not going to support Darwinian logic. Your body has made you aware of the strong odor and then adapts so that you can still pick up other scents without being overpowered by the loudest stink in the room.
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