This story from Discover Magazine
tells about Alan Kingstone, a psychologist doing research on the gaze-copying behavior found in humans and animals - the tendency we have to look where others are looking. While pondering the different hypotheses on this behavior, Kingstone mentioned them to his 12-year-old son, who suggested a possible method of testing whether or not humans focused on a subject's eyes or the center of their head - show them pictures from the Monster Manual
, including monsters like the Beholder, Otyugh, and Umber Hulk, that have eyes in other places.
It's an interesting article, and a great tribute to D&D
as a source of iconic images being used in scientific research.