Philosophy has taken an “affective turn”. Prompted by new empirical work and previous neglect, philosophers are devoting increasing attention to deep questions about the critically important phenomenon of affect or valence or hedonics -- in other words, the fact that many ingredients of our mental lives (bodily sensations, perceptual experiences, emotions, and so forth) feel good or bad, are positive or negative, are pleasant or unpleasant.
This is the focus of much of my published work. Core issues include: the nature of pain; the nature of pleasure and unpleasure; affective motivation; the relations between affect, on the one hand, and reasons, rationality, and action, on the other; the normative status of affect, particularly pain's unpleasantness; the emotions, especially their hedonic, motivational, and normative dimensions; the affective and motivational dimensions of gustatory, olfactory, tactile, auditory, and visual experiences; and perceptualist and evaluativist theories of pain, other bodily sensations, and emotional experience.
More general concerns underlying these include the nature of and relationships among perception, representational content, and phenomenal consciousness. Related interests include: vision and the nature of colour; disjunctivist, naive realist, and content-based conceptions of perceptual experience; bodily awareness and self-awareness; the perception of affordances; perceptual 'revelation'; externalist views of experience and thought content; recognitional capacities; the primary/secondary quality distinction and its relationship to differences among the ways in which we experience colours, shapes, temperatures, and natural kinds; and, finally, the very ideas of perceptual content and phenomenal character. I've also worked and published on Wittgenstein's private language argument.