I tend to hear everything; however, I might not hear someone speaking directly to me. I can hear high-pitched electrical hums, and I have to distract myself to avoid hearing my apartment neighbors, etc. talking. However, if someone I don't know tries to tell me something I don't expect, I might sense the words vibrating my ear drums without transmitting any meaning whatsoever. Sometimes, I can play it back later, sometimes not; it's a strange feeling.
I may not look like I'm paying attention when I am, and vice versa. It's easy to see how NTs could misunderstand either one. To the extent that I can choose, I'll choose to hear more.
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"I find that the best way [to increase self-confidence] is to lie to yourself about who you are, what you've done, and where you're going." - Richard Ayoade