ABSTRACT
A classic entry point for thinking about the idea of a "subjective aspect" of experience is through the notion of inter-subjective phenomenal variation, of which one can distinguish weak and strong varieties. Weak variation is pretty uncontroversial, because most philosophers and psychologists accept the possibility of perceptual illusion. More controversial is the possibility of strong inter-subjective variation: variation between subjects in the experience of a stimulus feature, despite the normal functioning of the subjects' perceptual systems, and despite the subjects' experiences not being illusory. The image of "slow-motion" experience suggests a very specific picture of what strong variation in duration experience would consist in. Even if human temporal experience is actually linear, the existence of non-linear temporal experience either in humans or other organisms is pretty clearly possible, and wouldn't even be particularly strange. Non-linear psychometric functions are pretty much the norm when it comes to the experience of other stimulus features like loudness, brightness, etc.
