How does the brain get used to a repeated sound or smell?
Quick Answer
The brain can reduce its response to harmless repeated stimuli, a process called habituation. This helps it focus on new or important changes.
The Full Story
Habituation is one of the simplest forms of learning. When a sound, smell, or other stimulus repeats without consequence, the brain gradually responds less strongly to it. This prevents constant, unimportant input from taking over attention. Habituation can happen in many parts of the nervous system, from basic sensory circuits to higher brain regions. It is one reason you may stop noticing a background fan or the smell of a room after a few minutes.
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