The episodes hadn't happened often in my life, but sometimes I hear people speak muffled. I have excellent hearing, but my brain is stopping me from hearing what is being said... my hearing returns to normal after when the person stop speaking. Temporary selective deafness which doesn't much effect background noise. That's what made it so strange, the background wasn't muffled as much, as the person who was speaking to me. How is that even possible? I chalked it up to one hell of a defence mechanism with; some questions that are best left unanswered... But I am curious has anyone else had spontaneous deafness?