@barefootrambling @niamhgarvey @dinobelbo @autistics
Seems like sound blockers let you sense what goes in our heads. Our brain likely negotiates the sensory input of both “bone" conduction with the regular world. Earplugs put us in a novel situation, so the ‘head echo’ is noticeable. I think that is how the electric (BT) headphones do the noise cancellation, by listening and using the input to block extra noise.
(Bone conduction is likely a simplistic euphemism for a lot of stuff.)