In the oddly-titled Dutch Chess documentary “The Love for Wood”, at 2:00 (with subtitles), eccentric Chess player Hein Donner says:
[…] a remarkable moment is the moment you will make your move. It’s the exact moment you touch the piece. In the split second you touch the piece you’ll see more than you have seen in the past thirty minutes or hour in which you have been thinking. The physical contact does something that enables you to see things you did not see before. That is why when someone blunders he sees it himself the very moment he touches the piece.
Of course in Go we don’t have touch-move, but it’s a similar effect.