Rocco J. Gennaro

Some contemporary Western theories of consciousness, such as the higher-order thought (HOT) theory and self-representationalism, hold that there is an implicit (pre-reflective) “self-awareness” that accompanies each conscious mental state. Important twentieth-century historical figures, such as Sartre and Brentano, have also embraced a similar position. This view, or something very close to it, can also be found centuries earlier in some Indian philosophy (such as in Dignāga) where conscious experience is thought of as “inherently reflexive” and cognition is understood to have a “dual-aspect.” In this chapter, I lay out some of the similarities and differences among these views and explain why I prefer the way that HOT theory accounts for such self-awareness as compared to the others, including HOT theory’s ability to avoid the much-discussed infinite regress threat and its more plausible explanation of introspection. I also explain how HOT theory, like many Buddhist accounts, is not logically committed to the existence of an enduring substantial “self.”

Dr. Johnson famously observed that in lapidary inscriptions a man is not upon oath. This observation applies with equal force to publishers and their advertisements for books. According to the blurb, the present volume “offers essential critical material for both novice and advanced scholars of early modern philosophy.” In fact, it would be a remarkably sophisticated novice who could derive much benefit from this anthology of essays on seventeenth-century Rationalism; not merely do the authors engage with difficult issues of interpretation but they often presuppose a detailed knowledge of the various positions in the exegetical debates. Nonetheless, the volume does live up to the second part of its billing: it offers a great deal for the specialist to get his or her teeth into. Despite the demands they make upon the reader, the contributions are of an almost uniformly high quality. The volume has its origins in a NEH Summer Seminar conducted by Jonathan Bennett, who himself contributes a characteristically elegant and lucid essay on Descartes’s theory of space. Bennett may take a justifiable pride in the accomplishments of the participants in his seminar.

I believe that there is a ubiquitous pre-reflective self-awareness accompanying first-order conscious states. However, I do not think that such self-awareness is itself typically conscious. On my view, conscious self-awareness enters the picture during what is sometimes called “introspection” which is a more sophisticated form of self-consciousness. I argue that there is a very close connection between consciousness and self-consciousness and, more specifically, between the structure of all conscious states and self-consciousness partly based on the higher-order thought theory of consciousness. A plausible notion of self-consciousness is, I think, simply having any degree of higher-order or meta-psychological thought. I argue that the connection between conscious states and self-consciousness is representational but also critically evaluate several different options. I then critique the alternative “acquaintance” theory of self-awareness and address a couple of recent criticisms of HOT theory. There is the potential danger of misrepresentation between self-awareness and conscious states which I also briefly address.

Various psychopathologies of self-awareness, such as somatoparaphrenia and thought insertion in schizophrenia, might seem to threaten the viability of the higher-order thought (HOT) theory of consciousness since it requires a HOT about one’s own mental state to accompany every conscious state. The HOT theory of consciousness says that what makes a mental state a conscious mental state is that there is a HOT to the effect that “I am in mental state M” (Rosenthal 2005, Gennaro 2012). In a previous publication (Gennaro 2015), I argued that a HOT theorist can adequately respond to this concern with respect to somatoparaphrenia. Somatoparaphrenia is a “depersonalization disorder” which is characterized by the sense of alienation from parts of one’s body. It is a bizarre type of body delusion where one denies ownership of a limb or an entire side of one’s body. My focus in the chapter, however, is on “inserted thoughts” which is a common symptom of schizophrenia, although it will also be useful to contrast it with somatoparaphrenia. Schizophrenia is a mental disorder which most commonly manifests itself through auditory hallucinations, paranoid or bizarre delusions, or disorganized speech and thinking. Thought insertion is the delusion that some thoughts are not “one’s own” in some sense or are somehow being inserted into one’s mind by someone else. Graham and Stephens (2000), for example, have suggested that thought insertion should be understood as alienated self-consciousness or meta-representation. I argue that HOT theory has nothing to fear from this phenomenon either and can consistently explain what happens in this admittedly unusual case.

Synesthesia literally means a “union of the senses” whereby two or more of the five senses that are normally experienced separately are involuntarily and automatically joined together in experience. For example, some synesthetes experience a color when they hear a sound, although many instances of synesthesia also occur entirely within the visual sense. In this paper, I first mainly engage critically with Sollberger’s view that there is reason to think that at least some synesthetic experiences can be viewed as truly veridical perceptions, and not as illusions or hallucinations. Among other things, I explore the possibility that many forms of synesthesia can be understood as experiencing what I will call “second-order secondary properties,” that is, experiences of properties of objects induced by the secondary qualities of those objects. In doing so, I shed some light on why synesthesia is typically one-directional and its relation to some psychopathologies such as autism.

In this introductory work, Mind and Brain: A Dialogue on the Mind-Body Problem, 2nd edition, Gennaro updates and expands the work to reflect current topics and discussions. The dialogue provides a clear and compelling overview of the mind-body problem suitable for both introductory students and those who have some background in the philosophy of mind. Topics include: Immortality, Materialism, Descartes' "Divisibility Argument" for substance dualism, The "Argument from Introspection" for substance dualism, The main objections to dualism, The interaction between mind and brain, The relation between brain damage and the prospect of an afterlife, Parallelism and epiphenomenalism, The type/token distinction within materialism and the problem of multiple realizability, Arguments against materialism and its ability to explain consciousness, Property dualism and panpsychism, The epistemological problem of other minds, The nature of inductive knowledge, Evidence for animal consciousness, The problem of machine or robot minds, The inverted spectrum argument. Also included are a brief Introduction, a list of Study Questions designed to enhance classroom discussion and serve as a resource for the development of paper topics, a Glossary, and an Index of Key Terms.

Various psychopathologies of self-awareness, such as somatoparaphrenia and thought insertion in schizophrenia, might seem to threaten the viability of the higher-order thought (HOT) theory of consciousness since it requires a HOT about one’s own mental state to accompany every conscious state. The HOT theory of consciousness says that what makes a mental state a conscious mental state is that there is a HOT to the effect that “I am in mental state M.” I have argued in previous work that a HOT theorist can adequately respond to this concern with respect to somatoparaphrenia and thought insertion. There is also Cotard syndrome which is a rare neuropsychiatric disorder in which people hold the delusional belief that they are dead, do not exist, or have lost their blood or internal organs. In this paper, I argue that HOT theory has nothing to fear from it either and can consistently account for what happens in such unusual cases. I analyze Cotard syndrome in light of my previous discussion of somatoparaphrenia and thought insertion, and argue that HOT theory can provide a somewhat analogous account without the worry of inconsistency. It is crucial to recognize that there are multiple “self-concepts” and levels of HOTs which can help to provide a more nuanced explanation. With regard to the connection between consciousness and self-consciousness, it is proposed that Cotard patients are indeed capable of having some “I-thoughts” about their bodies and mental states.

In Disturbed Consciousness, philosophers and other scholars examine various psychopathologies in light of specific philosophical theories of consciousness. The contributing authors—some of them discussing or defending their own theoretical work—consider not only how a theory of consciousness can account for a specific psychopathological condition but also how the characteristics of a psychopathology might challenge such a theory. Thus one essay defends the higher-order thought (HOT) theory of consciousness against the charge that it cannot account for somatoparaphrenia (a delusion in which one denies ownership of a limb). Another essay argues that various attempts to explain away such anomalies within subjective theories of consciousness fail. Other essays consider such topics as the application of a model of unified consciousness to cases of brain bisection and dissociative identity disorder; prefrontal and parietal underconnectivity in autism and other psychopathologies; self-deception and the self-model theory of subjectivity; schizophrenia and the vehicle theory of consciousness; and a shift in emphasis away from an internal (or brainbound) approach to psychopathology to an interactive one. Each essay offers a distinctive perspective from the intersection of philosophy, consciousness research, and psychiatry.

Somatoparaphrenia is a pathology of self characterized by the sense of alienaton from parts of one’s body. It is usually construed as a kind of delusional disorder caused by extensive right hemisphere lesions. Lesions in the temporoparietal junction are common in somatoparaphrenia but deep cortical regions (for example, the posterior insula) and subcortical regions (for example, the basal ganglia) are also sometimes implicated (Valler and Ronschi 2009). Patients are often described as feeling that a limb belongs to another person and thus attribute ownership of the limb and bodily sensation to someone else. There is also some question as to whether or not the higher-order thought (HOT) theory of consciousness can plausibly account for the depersonalization psychopathology of somatoparaphrenia (Liang and Lane 2009, Rosenthal 2010, Lane and Liang 2010). Liang and Lane argue that it cannot. The HOT theory of consciousness says that what makes a mental state a conscious mental state is that it is the target of a HOT to the effect that “I am in mental state M” (Rosenthal 2005, Gennaro 2012). When the HOT is itself is unconscious, the conscious state is still outer-directed. When the HOT is conscious, we have introspection and so the conscious thought is directed at the mental state. In section I, I briefly review the previous exchange between Lane and Liang and David Rosenthal. In section II, I further explore somatoparaphrenia and the nature of delusion while offering a number of additional replies to Lane and Liang. In section III, I examine the central notions of “mental state ownership” and “self-concepts” in an effort to account especially for the depersonalization aspect of somatoparaphrenia against the background of HOT theory. In section IV, I argue that to the extent that somatoparaphrenia casts doubt on the notion that some thoughts are “immune to error through misidentification” (IEM), the most fundamental aspect of IEM is still consistent with HOT theory. Overall, I argue that HOT theory is left unscathed by the pheneomenon of somatoparaphrenia and can even help to explain what happens in these cases.

My overall goal in The Consciousness Paradox: Consciousness, Concepts, and Higher-Order Thoughts is to solve what I take to be a paradox with regard to holding a series of interrelated theses, including a version of the higher-order thought theory of consciousness which says that what makes a mental state conscious is that there is a suitable higher-order thought directed at the mental state. Higher-order thoughts are metapsychological or meta-cognitive states, that is, mental states directed at other mental states. This theory is primarily concerned with explaining how conscious mental states differ from unconscious mental states. In The Consciousness Paradox I defend and further develop a metapsychological reductive representational theory of consciousness and then apply it to several importantly related problems including concept acquisition and animal consciousness.

In this chapter, I first review and assess evidence regarding brain damage or neural abnormalities associated with some psychopathologies and cognitive deficits, such as hemispatial neglect, agnosias, amnesia, somatoparaphrenia, and others. It becomes clear just how closely normal mental functioning and consciousness depend upon normal brain functioning as well as how some very specific mental changes occur when, and only when, very specific brain damage occurs. I then explore the metaphysical implications of these results with respect to the nature of mind and consciousness. In particular, I examine the plausibility of materialism, roughly the view that mental processes are brain processes, in light of the evidence discussed and in contrast to a dualist conception of the mind (whereby mental states are not physical in some sense). I also explore the prospects for a conscious afterlife based both on the brain damage evidence adduced and the metaphysical implications discussed.

An overview of higher-order representational theories of consciousness. Representational theories of consciousness attempt to reduce consciousness to “mental representations” rather than directly to neural or other physical states. This approach has been fairly popular over the past few decades. Examples include first-order representationalism (FOR) which attempts to explain conscious experience primarily in terms of world-directed (or first-order) intentional states (Tye 2005) as well as several versions of higher-order representationalism (HOR) which holds that what makes a mental state M conscious is that it is the object of some kind of higher-order mental state directed at M. The primary focus of this entry is on HOR and especially higher-order thought (HOT) theory. The key question that should be answered by any theory of consciousness is: What makes a mental state a conscious mental state? Section 1 introduces the overall representationalist approach to consciousness and briefly discuss Tye’s FOR. Section 2 presents three major versions of HOR: higher-order thought theory, dispositional higher-order thought theory, and higher-order perception theory. In section 3, a number of common and important objections and replies are presented. Section 4 briefly outlines a close connection between HOT theory and conceptualism, that is, the claim that the representational content of a perceptual experience is entirely determined by the conceptual capacities the perceiver brings to bear in her experience. Section 5 examines several hybrid higher-order and “self-representational” theories of consciousness which all hold that conscious states are self-directed in some way. Section 6 addresses the potentially damaging claim that HOT theory requires neural activity in the prefrontal cortex (PFC) in order for one to have conscious states.

In Gennaro (2016), I had originally replied to Fred Adams and Charlotte Shreve’s (2016) paper entitled “What Can Synesthesia Teach Us About Higher Order Theories of Consciousness?,” previously published in Symposion. I argued that H.O.T. theory does have the resources to account for synesthesia and the specific worries that they advance in their paper, such as the relationship between concepts and experience and the ability to handle instances of ‘pop-out’ experiences. They counter-reply in Adams and Shreve (2017) and also raise further objections to H.O.T. theory which go well beyond the scope of their 2016 paper. In this paper, I offer additional replies to the points they raise in Adams and Shreve (2017).

Consciousness entails self-consciousness. The entailment is generally denied for two reasons: some primitive forms of consciousness do not seem to require self-consciousness, and self-consciousness is regarded as a sophisticated capacity that need not accompany all conscious states. However, I show that what best explains how a mental state becomes conscious is that it is accompanied by a meta-psychological thought to the effect that one is in that mental state. I argue at some length that the meta-psychological state must specifically be a thought , and show why reductionist accounts will not yield the desired explanation. ;Self-consciousness simply involves having meta-psychological thoughts or 'awareness', and must be distinguished from 'introspection' which is a more sophisticated form of self-awareness. Thus, given an adequate theory of conscious mentality, it follows that having conscious mental states entails self-consciousness. ;After arguing that mentality per se does not require consciousness, a series of arguments for the conclusion that 'being a conscious creature or system entails being self-conscious' is explored. The arguments center around the nature of phenomenal states, de se attitudes, and episodic memory. The fundamental strategy in each case is to argue first that being a conscious system involves having a specific mental capacity , and then to show how having that capacity involves self-consciousness. Most of these arguments succeed in proving the desired conclusion

This essay explores the topic of Dissociative Identity Disorder (formerly called “Multiple Personality Disorder”) with special attention to such Quadrophenia masterpieces as “Dr. Jimmy” and “The Real Me.” A number of major philosophical questions arise: Can two or more “persons” really inhabit the same body? How can we hold Dr. Jimmy morally responsible for the reprehensible actions of Mr. Jim? Wouldn’t it be wrong to do so if they are really different people? What is it to be the “same” person over time? Does Dr. Jimmy really have free will? The focus is on the much discussed and important notions of personal identity, free will, and moral responsibility.

For patients under anesthesia, it is extremely important to be able to ascertain from a scientific, third person point of view to what extent consciousness is correlated with specific areas of brain activity. Errors in accurately determining when a patient is having conscious states, such as conscious perceptions or pains, can have catastrophic results. Here, I argue that the effects of (at least some kinds of) anesthesia lend support to the notion that neither basic sensory areas nor the prefrontal cortex (PFC) is sufficient to produce conscious states. I also argue that it this is consistent with and supportive of the higher-order thought (HOT) theory of consciousness. I therefore disagree in some ways with Mehta and Mashour (2013), who argue that evidence from anesthesia mainly favors a first-order representational (FOR) theory, as opposed to HOT theory (and many other theories, for that matter).

The higher-order thought (HOT) theory of consciousness is a reductive representational theory of consciousness which says that what makes a mental state conscious is that there is a suitable HOT directed at that mental state. Although it seems that any neural realization of the theory must be somewhat widely distributed in the brain, it remains unclear just how widely distributed it needs to be. In section I, I provide some background and define some key terms. In section II, I argue against the view that HOT theory should treat first-order (i.e. world-directed) conscious states as requiring prefrontal cortical activity though it is reasonable to suppose that conscious states are realized in the brain. In section III, I then explore some of the key background metaphysical issues involved in understanding the nature of consciousness, such as the debate between realism and idealism as well as the prospects for solving the so-called “hard problem” of consciousness. Some of the differences in question often mirror the traditional differences between Western and Eastern perspectives on the nature of consciousness. Overall, I argue that some form of realism and physicalism is more plausible than the opposing views. I also argue that materialists (and especially HOT theorists) can offer plausible replies to the hard problem.

Questions on the nature of concepts in philosophy, psychology, and cognitive science, such as ‘What are concepts?’ and ‘What is it to possess a concept?’ are notoriously difficult to answer. For example, are concepts abstract mind-independent objects in some Platonic or Fregean sense, or are they better understood as mental representations, such as constituents of thoughts? A common view in cognitive science is that thought is based on word-like mental representations; some say that possessing a concept C involves demonstrating some kind of ability with respect to C’s. But which ability? Other longstanding issues concern a proper theory of the structure of concepts. These questions are tackled here by Simon Baron-Cohen, Peter Carruthers, and a distinguished cast of scientists and philosophers.

My aim in this paper is to show that consciousness entails self-consciousness by focusing on the relationship between consciousness and memory. More specifically, I addreess the following questions: (1) does consciousness require episodic memory?; and (2) does episodic memory require self-consciousness? With the aid of some Kantian considerations and recent empirical data, it is argued that consciousness does require episodic memory. This is done after defining episodic memory and distinguishing it from other types of memory. An affirmative answer to (2) is also warranted especially in the light of the issues raised in answering (1). I claim that 'consciousness entails self-consciousness' is thereby shown via the route through episodic memory, i.e. via affirmative answers to (1) and (2). My aim is to revive this Kantian thesis and to bring together current psychological research on amnesia with traditional philosophical perspectives on consciousness and memory.

We argue that analyzing everyday memory failures in terms of the “unity of consciousness” can elucidate the bases of such failures. A perfect unity amongst one’s mental states is rare. In extreme cases the unity of consciousness can breakdown in dramatic fashion , but such breakdowns also occur in less dramatic ways that affect us in everyday life. For example, disruptions in the unity of consciousness can result in everyday memory failures, such as forgetting to put on a tie for an important formal meeting. After providing some philosophical background into the notions of “unity of consciousness” and “functionalism,” we offer preliminary analyses of three examples of everyday memory failure. We then introduce and develop what we call the “unity model” of memory failure and show how it explains the examples. We also describe different ways that unity can break down which, in turn, can lead to memory failure and inappropriate behavior. We then show how slips of action and other kinds of cognitive failures differ from everyday memory failures. Finally, we examine alternative models arguing that the unity model is preferable, and then show how our model is consistent with some experimental results

This is a fine and important collection of eleven recently published essays by Peter Carruthers, a leading figure in contemporary philosophy of mind. The book contains a very helpful introduction that provides a nice overview of Carruthers’ basic views and orients the reader to the key issues. The introduction also presents a brief summary of the eleven chapters that comprise the remainder of the book. Only three of the essays initially appeared prior to Carruthers’ important 2000 book Phenomenal Consciousness: A Naturalistic Theory. One of these is significantly rewritten: an essay entitled “Natural Theories of Consciousness,” which will be familiar to readers of Psyche since it was the subject of a symposium in volumes 4-6. There is also one entirely new essay entitled “Dual-Content Theory: the Explanatory Advantages”. Thus, there is much to learn about Carruthers’ theory of consciousness even for those very familiar with his 2000 book. Indeed, one might think of this collection as elaborating upon Carruthers’ views as found in his earlier book. In the relatively short period of a few years, Carruthers has managed to publish an impressive number of quality essays, which comprise most of this anthology. It is very convenient to have these nicely written essays all in one place. For those unfamiliar with Phenomenal Consciousness, this book is still readable on its own and contains many helpful summaries of Carruthers’ earlier work.

In the absence of any plausible reductionist account of consciousness in nonmentalistic terms, the HOT theory says that the best explanation for what makes a mental state conscious is that it is accompanied by a thought (or awareness) that one is in that state. I discuss HOT theory with special attention to how Leibnizian theses can help support it and how it can shed light on Leibniz's theory of perception, apperception, and consciousness. It will become clear how treating Leibniz as a HOT theorist can solve some of the problems he faced and some of the puzzles posed by commentators, e.g. animal mentality and the role of reason and memory in self-consciousness.

Consciousness is arguably the most important interdisciplinary area in contemporary philosophy of mind, with an explosion of research over the past thirty years from philosophers, psychologists, and scientists. It is also perhaps the most puzzling aspect of the world despite the fact that it is familiar to each of us. Consciousness also seems resistant to any straightforward physical explanation. This book introduces readers to the contemporary problem of consciousness, providing a clear introduction to the overall landscape and a fair-minded critical survey of various theories of consciousness. Beginning with essential historical background to the problem of consciousness, Rocco Gennaro explores the following key topics and debates: the metaphysical problem of consciousness, including varieties of dualism and materialism; consciousness and neuroscience, particularly the question of whether consciousness can be reduced to brain activity or attentional mechanisms; representational and cognitive theories of consciousness; consciousness and psychopathology; animals, machines, and consciousness. Extensive use is made of interesting phenomena throughout the book, ranging from blindsight, synaesthesia, and change blindness to phantom limb syndrome, split-brain cases, and dissociative identity disorder. The inclusion of chapter summaries, annotated further reading, and a glossary make this book essential reading for anyone seeking a clear and informative overview of the problem of consciousness, not only in philosophy but related fields such as psychology and cognitive science.