Many objectivist theories of beauty have been offered, going from the ancient ideas of Plato and Aristotle (e.g., the golden mean,) which still have great appeal in their own way to neuroscience research into the brain's response to images and other sense information. At the moment, even though we do not know what people are thinking, brain-scan technology can identify when people are responding pleasurably to images, providing some clue as to how certain images affect some people.