synaesthesia
Any of you who might be interested in exploring the idea of synaesthesia in Sophocles might want to look at the following:
Wednesday is Indigo Blue: Discovering the Brain on Synesthesia by Richard E. Cytowic and David Eagleman. I recommend it only because David Eagleman is one of the authors. His book Incognito: The Secret Lives of the Brain is a fabulous read. I've been recommending it to all of my friends. He is informative on the subject of neuroscience and has a wonderful writing style The book on synaesthesia is so described on Amazon: