In a soundless room, no one can hear you scream
I visited an acoustically dead chamber once in the engineering building of a university. I remember there being a compelling illusion of having something stuffed in my ears.
I do know that in the course of multi-day silent meditation retreats, where you’re facing the wall for 12 hours a day and receiving very little sensory input, it’s very common for the brain to just start creating its own sensory stimulation. You learn to expect it and see it as illusion. It all makes for amusing stories after the retreat.
I went to one retreat at a temple in Madison, Wi. Late one night, I heard a lion roar. It sounded so real, and I just grinned at the creativity of my brain. I found out after the retreat that the zoo was a couple of blocks from the temple.