The best story I heard on the subject of hearing your own voice is told by a local publican about an incident just after portable tape recorders became popular.
A singing session used to take place here in Clare in his pub and a visitor brought along a tape recorder.
One old singer (80+), not knowing he was being recorded, sang a song, then immediately after it went out to the toilet. When he came back the visitor was playing the recording he had just made.
The old man stood at the door listening intently and when it had finished he said, "word perfect, but he's got the tune wrong".
Jim Carroll