Your body has thresholds for when a sensation alerts your attention.
If it didn’t, you’d always feel it and it’d be more distraction. Imagine if none of your senses had thresholds: you’d smell smells you normally tune out, see lots of little motions you normally tune out, hear lots of background noises you tune out, feel your clothes brushing at you constantly, etc.
All these things would become overwhelming and you’d struggle to concentrate on anything you need to do because of the overwhelming sensory information.
These thresholds allow you to know certain sensations should be considered normal and can be ignored.
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