What is the word for the phenomenon where your brain blocks out background sounds, because they are constant?
For example when you don't hear the air conditioning whirring away until it stops.
Answer
The word used in psychology for becoming used to a stimulus is habituation
Habituation is a decrease in response to a stimulus after repeated presentations. For example, a novel sound in your environment, such as a new ring tone, may initially draw your attention or even become distracting. After you become accustomed to this sound, you pay less attention to the noise and your response to the sound will diminish. This diminished response is habituation.
It is not limited to sounds (it covers all the senses) but it is involuntary.
Another possibility is desensitise
to make somebody/something less aware of something, especially a problem or something bad, by making them become used to it
Although it does often come with negative connotations, you could use it in a neutral context and be understood.
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