Matthew Soteriou

It is commonly held that the experiences involved in cases of perception, illusion and hallucination all have the same nature. Disjunctivists deny this. They maintain that the kind of experience you have when you perceive the world isn’t one you could be having if you were hallucinating. A number of important debates in the philosophy of mind and epistemology turn on the question of whether this disjunctivist view is tenable. This is the first book-length introduction to this contested issue. Matthew Soteriou explains the accounts of perception that disjunctivists seek to defend, such as naïve realism, and the accounts to which they are opposed, such as sense-datum theories and representationalist theories. He goes on to introduce and assess key questions that arise in these debates: Is disjunctivism consistent with what has been established by the science of perception? Does introspective reflection support naïve realism? Can disjunctivism be motivated by appeal to the role that perception plays in enabling us to think demonstratively about mind-independent objects and qualities in our environment? Does disjunctivism offer the best account of perceptual knowledge? What can disjunctivists say about the nature of hallucination and illusion? Including chapter summaries, annotated further reading and a glossary, this book is an ideal starting point for anyone studying disjunctivism for the first time, as well as for more advanced students and researchers.

Howard Robinson's Perception is now rightly regarded as essential reading for anyone seeking to understand the sense-datum theory of perception and its motivations. It should also be regarded as essential reading for those with a more general philosophical interest in perception and sensory consciousness. As well as discussing the history of the sense-datum theory, and the nature of sense-data and their relation to the physical world, Robinson offers critiques of physicalist theories of perception, intentional/representational theories, adverbial theories, and naive realist/disjunctivist theories. Along the way he also discusses Wittgenstein's private language argument and the nature of secondary qualities. Over the course of the book we are presented with a sustained, and forthright, defence of a sense-datum theory in its traditional form. The arguments are clear, briskly delivered, and challenging. Here I highlight two key elements in Robinson's case for a sense-datum theory, which I think pose an especially serious challenge for his opponents. These are his articulation and defence of the ‘phenomenal principle’ and his ‘revised’ causal argument for sense-data.

This chapter focuses on the phenomenology of mental agency by addressing the question of the ontological category of the conscious mental acts an agent is aware of when engaged in such directed mental activities as conscious calculation and deliberation. An argument is offered for the claim that the mental acts in question must involve phenomenally conscious mental events that have temporal extension. The problem the chapter goes on to address is how to reconcile this line of thought with Geach's arguments for the claim that mental acts like judging lack temporal extension.

This chapter discusses the causal requirements on perceptual success in putative cases of the perception of absence – in particular, in cases of hearing silence and seeing darkness. It is argued that the key to providing the right account of the respect in which we can perceive silence and darkness lies in providing the right account of the respect in which we can have conscious perceptual contact with intervals of time and regions of space within which objects can potentially be perceived. In this account, a significant explanatory role is assigned to comparatively invariant structural features of our conscious experience of regions of space and intervals of time. The chapter discusses how the explanatory role assigned to these structural features affects our view of the causal requirements on perceptual success

Perceptual experiences are often divided into the following three broad categories: veridical perceptions, illusions, and hallucinations. For example, when one has a visual experience as of a red object, it may be that one is really seeing an object and its red colour (veridical perception), that one is seeing a green object (illusion), or that one is not seeing an object at all (hallucination). Many maintain that the same account should be given of the nature of the conscious experience that occurs in each of these three cases. Those who hold a disjunctive theory of perception deny this. Disjunctivists typically reject the claim that the same kind of experience is common to all three cases because they hold views about the nature of veridical perception that are inconsistent with it

This paper addresses the following questions: what account should be given of the state of wakeful consciousness, and what explanatory roles should be assigned to that state? Those questions are taken up after some discussion of the related but distinct question of what it is to be awake. On the view proposed here, in seeking to provide an account of the state of wakeful consciousness one should be aiming to provide an account of a point of view that is associated with the distinctive form of awareness to which one surfaces when one wakes up. Our specification of that point of view should appeal to the awake subject’s temporal point of view, and the epistemic orientation and agential perspective it embodies. The explanatory roles that can be assigned to the state of wakeful consciousness are the explanatory roles that can be assigned to that point of view.