This is a very interesting topic that I know very little about. I feel that even with the experiments that Zeki is doing, it will be next to impossible to find or define universal beauty. Although his experiments show that certain areas of the brain respond to different stimuli and when we see something we like, the activity in whatever area increases, this does not necessarily lead to a definition of universal beauty. There are so many social factors that lead to personal preferences that must be taken into consideration. What makes one person love a piece of art and another person detest it? It would be interesting to investigate these factors as well. I wonder if he has done any experiments using works that people don't necessarily find visually stimulating or beautiful, but may find intellectually stimulating. Much of the art produced in the last century is focused more on investigating or representing a concept or idea than being an object of beauty. So I wonder whether his studies will even be relevant for much longer.
I sort of like the idea of basing the value of a piece of work based on the nuerological responses of people's brains. It would certainly shake things up in the art world and might solve the question of "Why did that piece of junk sell for $2million?!". I had to laugh at the idea of art critics and auction houses being in a state of panic.