Thinking about how the human brain doesn’t like constant stimuli unless the person experiencing it is also the one making it. Like how people click their pens repeatedly, they don’t find it annoying but everyone else does. I theorize that the reason people find it annoying...

is because it disrupts the constant attentiveness that we subconsciously have to avoid danger. The brain hears a click and immediately deciphers what the sound was, which is identified as a pen easily and seen as a non threat. When the sound is repeated however, the brain...

analyzed and identifies it repeatedly as well. This constant analyzation of the sound creates a feeling of very mild anxiety, which often gets demoted to simple annoyance. The reason this does not occur to the person creating the sound is because they themselves are aware...

of the sound’s source and threat level much more directly, since they are in full control over it. When you click a pen, your brain is subconsciously ready for the sound since it is familiar with the action and will hence not analyze it unless it was not what was expected.

This theory is completely made up from inferences I’ve made in how the brain takes in stimuli and I’ve done no research into this, so don’t take this thread as fact.
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