Of his earlier work, he is perhaps best known for the first chapter of his 1983 book, "Sense and Content", entitled "Sensation and the Content of Experience." In this chapter, Peacocke defends the claim that perceptual experience, over and above its intentional content, has certain "sensational properties". He gives three different examples of visual scenarios where intentional content alone cannot capture every aspect of the experience. Those aspects which elude intentional content are thought to be the sensational properties of the experience. Some of those who defend qualia have used these examples as evidence of their existence. Several philosophers have criticized these examples (Michael Tye, Fred Dretske), claiming that the supposed extra quality can indeed be captured in terms of intentional content.