My experience with my husband is that he hears sounds just fine, even things I don't hear. I did some research on this, and because of his dementia, his brain is not deciphering what is being said. It appears that he is hard of hearing when he isn't. he just does not understand what is being said, so I repeat what I am trying to convey in simple terms. If it is essential, the TV goes off, and I insist he put his tablet down. He thinks he can multitask - yet you can remark about something on TV and he does not know what you are talking about, ask him a question about what he is watching on his tablet and he cannot tell you -