Diversity Reading List

Abstract: What is it like to be a bat? This is one of the most famous questions ever asked in the history of consciousness studies. First posed in 1950 it was made famous in a 1974 paper of that name by American philosopher Thomas Nagel. Nagel argued that understanding how mental states can be neurons firing inside the brain is a problem quite unlike understanding how water canbe H2O, or how genes can be DNA. 'Consciousness is what makes the mind-body problem really intractable,' he said (Nagel, 1974: 435; 1979:165), and by consciousness he meant subjectivity. To make this clear he asked 'What is it like to be a bat?'. Do you think that your cat is conscious? Or the birds outside in the street? Perhaps you believe that horses are conscious but not worms, or living creatures but not stones. We shall return to these questions (Chapter 12) but here let's consider what it means to say that another creature is conscious. If you say that the stone is not conscious you probably mean that it has no inner life and no point of view; that there is nothing it is like to be the stone. If you believe that the neighbour's vicious bloodhound, or the beggar you passed inthe subway, is conscious, then you probably mean that they do have a point of view; there is something it is like to be them. As Nagel put it, when we say that another organism is conscious we mean that 'there is something it is like to be that organism . . . something it is like for the organism' (1974: 436); 'the essence of the belief that bats have experience is that there is something that it is like to be a bat' (ibid.: 438). This is probably the closest we can come to a definition of consciousness - that consciousness is subjectivity, or 'what it is like to be . . .'. Here we must be careful with the phrase 'what it is like . . .'. Unfortunately there are at least two meanings in English. We might say 'this ice cream tastes like rubber' or 'lying on a beach in the sun is like heaven'. In this case we are comparing things, making analogies, or saying what they resemble. This is not what Nagel meant. The other meaning is found in such questions as: What is it like to work at McDonald's? What is it like to be able to improvise fugues at the keyboard?...to be someone inconceivably more intelligent than yourself?...to be a molecule, a microbe, a mosquito, an ant, or an ant colony? (Hofstadter and Dennett, (1981: 404-5), pose many more such provocative questions.) In other words, what is it like from the inside? Now, imagine being a bat. A bat's experience must be very different from that of a human. For a start the bat's sensory systems are quite different, which is why Nagel chose the bat for his famous question. Bats' brains, lives and sensesare well understood (Akins, 1993; Dawkins, 1986). Most use either sound or ultrasound for echolocation. That is, they detect objects by emitting rapid high-pitched clicks that bounce off any objects in the vicinity and then measuring the time taken for the echo to return. Natural selection has found ingenious solutions to the many interesting problems posed by echolocation. Some bats cruise around emitting clicks quite slowly so as not to waste energy, but then when they are homing in on prey or approaching a potential danger, they speed up. Many have mechanisms that protect their ears from the loud blastof each click and then open them to receive the faint echo. Some use the Doppler shift to work out their speed relative to prey or other objects. Others sort out the mixed-up echoes from different objects by emitting downward-swooping sounds. The echoes from distant objects take longer to come back and therefore sound higher than the echoes from nearer objects. In this way we can imagine that a whole bat world is built up in which higher sounds mean distant objects and lower sounds mean nearer objects. What would this be like? According to Oxford biologist Richard Dawkins (1986; see Profile, Chapter 10), it might be like seeing is for us. We humans do not know, or care, that colour is related to wavelength or that motion detection is carried out in the visual cortex. We just see the objects out there in depth and colour. Similarly the bat would just perceive the objects out there in depth, and perhaps even in some batty, sonar, version of colour. Living in this constructed world would be what it is like to be the bat. But can we ever know what it would really be like for the bat? As Nagel pointed out, the question is not answered by trying to imagine that you are a bat. This will not do. It is no good hanging upside down in a darkened room, making little clicks with your tongue and flapping your arms like wings. Perhaps if you could magically be transformed into a bat you would know. But even this won't do. For if you were a bat, the bat in question would notbe an ordinary bat - what with having your memories and your interest inconsciousness. But if you became an ordinary bat then this bat would have no understanding of English, no ability to ask questions about consciousness, and could not tell us what it was like. So we cannot know what it is like to be a bat even if we believe that there is something it is like to be a bat. Nagel's question clarifies the central meaning of the term 'consciousness'. It is what the American philosopher Ned Block (1995) calls 'phenomenal consciousness' or phenomenality. He explains that 'Phenomenal consciousness isexperience; what makes a state phenomenally conscious is that there is something 'it is like' to be in that state.' He distinguishes this from 'access consciousness', which is 'availability for use in reasoning and rationally guiding speech and action' (Block, 1995: 227). We will return to this distinction (Chapter 18), and consider issues to do with availability, but 'phenomenal consciousness' is what this book is all about. So what is it like to be you now? Everything I have said so far implies that there is, uncontroversially, something it is like to be you now - that the problems only begin when you start asking about what it is like to be someone orsomething else. But is this right? A thoroughly sceptical approach would meanquestioning even this. I urge you to do this chapter's 'Practice' and become a little more familiar with what it is like to be you.

Abstract: It is argued that it is important for cognitive scientists to understand both the precise nature of RTM, and the challenges to it. The biggest foundational challenge is to develop an adequate naturalistic theory of how representational content is determined. Philosophers have proposed several ingenious theory-sketches of content determination but none accounts for the full range of semantic features mental representations arguably have. Another major challenge is the existence of non-representational competitor research programs. A likely future scenario is that we will be able to explain certain 'low-level' aspects of cognition without resort to representations but that representational hypotheses will still be needed to account for the intentionality-based features of cognition and 'representation hungry' higher-level processes.

Abstract: The Explanatory Gap' is a label for the idea that we cannot explain consciousness in terms of brain activity. There are many different formulations of the explanatory gap, but all discussion about it assumes that there is only one gap, which consists of the absence of a deductive explanation. This assumption is mistaken. In this paper, I show that the position that deductive explanation is privileged in this case is unmotivated. I argue that whether or not there is an explanatory gap depends on the kind of explanation in question, so there is no single, unified explanatory gap but only the absence and (perhaps) presence of different sorts of explanation.

Abstract: Is it possible that a person who behaves just like you and me in normal life situations and applies colour words to objects just as we do and makes the same colour discriminations and colour similarity judgements that we make, see green where we see red and red where we see green? Many philosophers assert that the description of such a case is somehow incoherent. Often the motivation for this assertion is "that they suspect that admitting that claim [the possibility of such a case] will put one on a slippery slope which will eventually land one in skepticism about other minds".1 Among philosophers, however, it does not seem to be common knowledge that there is scientific evidence for the existence of such cases. Theories about the physiological basis of colour vision deficiencies together with theories about the genetics of colour vision deficiencies lead to the prediction that some people are 'pseudo- normal' (according to an estimation of Piantanida (1974) this occurs in around 14 of 10 000 males). 2 Pseudonormal people "would be expected to have normal colour vision except that the sensations of red and green would be reversed - something that would be difficult, if not impossible, to prove. ''3 Any philosophical theory of mind or more specifically about colour, colour appearances or colour concepts should meet the following plausible prima facie constraint: No hypotheses accepted or seriously considered in colour vision science should be regarded according to a philosophical theory to be either incoherent or unstatable or false. Therefore - regardless of whether the hypothesis of the existence of pseudonormal people is correct- the mere fact that the hypothesis is seriously considered in colour vision science, is philosophically relevant. Central claims of colour vision science when combined with specific empirical assumptions lead to the prediction that there are red-green-inverted people. Therefore any philosophical theory which excludes such a case does not meet the above formulated constraint. The failure to meet this prima facie constraint does not in itself justify the rejection of a philosophical proposal, but it does represent a serious objection. This kind of criticism will be advanced against some widely held philosophical proposals in the present paper. But let me begin with a short sketch of the relevant parts of colour vision science.

Introduction: Everyone familiar with the current mind-body debate has probably heard about Frank Jackson's neurophysiologist Mary. So I tell her story very briefly. Mary knows everything there is to know about the neurophysiological basis of human colour vision but she never saw colours herself (she always lived in a black-and-white environment). When Mary is finally released into the beauty of the coloured world, she acquires new knowledge about the world and - more specifically - about the character of the visual experiences of others. This appears clear at first sight. In the ongoing philosophical debate, however, there is no agreement about whether Mary really gains new knowledge and about whether this would, if it were so, represent a problem for physicalism. Those who defend the so-called argument from knowledge (or 'knowledge argument') think that it does.

Abstract: It seems that a solution to the body problem, or at least one that helps us to better understand the mind-body problem, is not forthcoming. And I take it this indicates that, at least for the time being, we should focus on questions other than the question 'Is the mind physical?' To this end, I would like to suggest a question that, I think, highlights some of the central concerns of both physicalists and dualists. And this is the question of whether the mental is fundamentally non-mental. For it seems that physicalism is, at least in part, motivated by the belief that the mental is ultimately non-mental, that is, that mental properties are not fundamental properties, while a central tenet of dualism, precisely, that they are. Of course the notion of the non-mental is also open ended. And, for this reason, it may be just as difficult to see, what sort of considerations are relevant in determining what counts as non-mental as it is to see what sort of considerations could be relevant in determining what counts as physical. But, of course, this is a project for another paper. One advantage, however, is that, arguably, we do have a grasp of one side of the divide - that is, the mental side. So, perhaps, rather than worrying about whether the mind is fundamentally physical, we should be concerned with whether the mind is fundamentally non-mental. And this, I should mention, is a concern that has little to do with what current physics, future physics, or a final physics says about the world.

Publisher's Note: Charles Siewert offers a persuasive argument to show that the presence of certain phenomenal features logically suffices for the presence of certain intentional ones. He claims that this shows that phenomenal features are inherently intentional. I argue that he has not established the latter thesis, even if we grant the logical sufficiency claim. For he has not ruled out a rival alternative interpretation of the relevant data, namely, that intentional features are inherently phenomenal

Abstract: The content of the externalist thesis about the mind depends crucially on how we define the distinction between the internal and the external. According to the usual understanding, the boundary between the internal and the external is the skull or the skin of the subject. In this paper I argue that the usual understanding is inadequate, and that only the new understanding of the external/internal distinction I suggest helps us to understand the issue of the compatibility of externalism and privileged access

Abstract: This paper explores the relationship between several ideas about the mind and cognition. The hypothesis of extended cognition claims that cognitive processes can and do extend outside the head, that elements of the world around us can actually become parts of our cognitive systems. It has recently been suggested that the hypothesis of extended cognition is entailed by one of the foremost philosophical positions on the nature of the mind: functionalism, the thesis that mental states are defined by their functional relations rather than by their physical constituents. Furthermore, it has been claimed that functionalism entails a version of extended cognition which is sufficiently radical as to be obviously false. I survey the debate and propose several ways of avoiding this conclusion, emphasizing the importance of distinguishing the hypothesis of extended cognition from the related notion of the extended mind.

Abstract: This article discusses recent disagreements over the correct formulation of physicalism. Although there appears to be a consensus outside those who discuss the issue that physicalists believe that what exists is what is countenanced by physics, as we will see, this orthodoxy faces an important puzzle now frequently referred to as 'Hempel's Dilemma'. After surveying the historical trajectory from Enlightenment-era materialism to contemporary physicalism, I examine several mainstream approaches that respond to Hempel's dilemma, and the benefits and drawbacks of each.