Studies have shown that both serotonin and glutamate receptor systems play a crucial role in the mechanisms underlying drug-induced synesthesia. The specific nature of these mechanisms, however, continues to remain elusive. Here we propose two distinct hypotheses for how synesthesia triggered by hallucinogens in the serotonin-agonist family may occur. One hypothesis is that the drug-induced destabilization of thalamic projections via GABAergic neuronal circuits from sensory areas leads to a disruption of low-level, spontaneous integration of multisensory stimuli. This sort of integration (...) regularly occurs when spatial and temporal attributes match. Destabilization of feedback loops, however, can result in incongruent experiences or binding of random thalamus activation with sensory input in a particular sensory modality. The second hypothesis builds on embodied cognition, cases in which visual images of external stimuli activate task-related neural regions. On this proposal, binding processes that do not normally generate awareness become accessible to consciousness as a result of decreased attentional discrimination among incoming stimuli. (shrink)

Jones and Coleman are among a handful of otherwise normal as a child and the number 5 was red and 6 was green. This the- people who have synesthesia. They experience the ordinary ory does not answer why only some people retain such vivid world in extraordinary ways and seem to inhabit a mysterious sensory memories, however. You might _think _of cold when you no-man’s-land between fantasy and reality. For them the sens- look at a picture of an ice cube, (...) but you probably do not feel es—touch, taste, hearing, vision and smell—get mixed up in- cold, no matter how many encounters you may have had with stead of remaining separate. ice and snow during your youth. Modern scientists have known about synesthesia since Another prevalent idea is that synesthetes are merely being 1880, when Francis Galton, a cousin of Charles Darwin, pub- metaphorical when they describe the note C flat as “red” or say lished a paper in _Nature _on the phenomenon. But most have that chicken tastes “pointy”—just as you and I might speak of brushed it aside as fakery, an artifact of drug use (LSD and a “loud” shirt or “sharp” cheddar cheese. Our ordinary lan- mescaline can produce similar effects) or a mere curiosity. guage is replete with such sense-related metaphors, and perhaps About four years ago, however, we and others began to un- synesthetes are just especially gifted in this regard. cover brain processes that could account for synesthesia. Along We began trying to find out whether synesthesia is a gen- the way, we also found new clues to some of the most mysteri- uine sensory experience in 1999. This deceptively simple ques- ous aspects of the human mind, such as the emergence of ab- tion had plagued researchers in this field for decades. One nat- stract thought, metaphor and perhaps even language. ural approach is to start by asking the subjects outright: “Is this A common explanation of synesthesia is that the affected just a memory, or do you actually see the color as if it were right people are simply experiencing childhood memories and asso- in front of you?” When we tried asking this question, we did ciations.. (shrink)

Jean-Paul Sartre is an undisputed giant of twentieth-century philosophy. His intellectual writings popularizing existentialism combined with his creative and artistic flair have made him a legend of French thought. His tumultuous personal life - so inextricably bound up with his philosophical thinking - is a fascinating tale of love and lust, drug abuse, high profile fallings-out and political and cultural rebellion. This substantial and meticulously researched biography is accessible, fast-paced, often amusing and at times deeply moving. Existentialism and Excess covers (...) all the main events of Sartre's remarkable seventy-five-year life from his early years as a precocious brat devouring his grandfather's library, through his time as a brilliant student in Paris, his wilderness years as a provincial teacher-writer experimenting with mescaline, his World War II adventures as a POW and member of the resistance, his post-war politicization, his immense amphetamine fueled feats of writing productivity, his harem of women, his many travels and his final decline into blindness and old age. Along the way there are countless intriguing anecdotes, some amusing, some tragic, some controversial: his loathing of crustaceans and his belief that he was being pursued by a giant lobster, his escape from a POW camp, the bombing of his apartment, his influence on the May 1968 uprising and his many love affairs. Cox deftly moves from these episodes to discussing his intellectual development, his famous feuds with Aron, Camus, and Merleau-Ponty, his encounters with other giant figures of his day: Roosevelt, Hemingway, Heidegger, John Huston, Mao, Castro, Che Guevara, Khrushchev and Tito, and, above all, his long, complex and creative relationship with Simone de Beauvoir. Existentialism and Excess also gives serious consideration to Sartre's ideas and many philosophical works, novels, stories, plays and biographies, revealing their intimate connection with his personal life. Cox has written an entertaining, thought-provoking and compulsive book, much like the man himself. (shrink)

Induced by intake of the psychedelic substances LSD, psilocybin, DMT and mescaline, psychedelic experiences have been extensively described by subjects as entailing a most unusual increase in the scope and quality of their consciousness. Accordingly, psychedelic experiences have been widely characterised as an “expansion of consciousness.” This article poses the following question, as yet unaddressed in contemporary philosophy and the tradition of phenomenology: to what exactly does “expansion of consciousness” refer as a general characterisation of psychedelic experiences, and what (...) role might attention play therein? On the basis of Aron Gurwitsch’s phenomenology of attention, the following thesis is presented: (a) “expansion of consciousness” refers to a particular restructuration of consciousness in psychedelic experiences. (b) This occurs by means of certain extreme transformations in direction, scope, mode and degree of attention. In order to explicate this thesis, the characteristic features of psychedelic experiences that pertain to expansion of consciousness and attention are first systematically identified from a survey of subject reports. Second, it is demonstrated that the few previous attempts to understand expansion of consciousness in terms of attention as a filter/reducing-valve, spotlight or zoom-lens each fail to explain how consciousness is structured in psychedelic experiences. Third, it is argued that psychedelic expansion of consciousness is a general restructuration of consciousness by means of extreme attentional transformations. In conclusion, brief consideration is given to the question of whether psychedelic expansion of consciousness can have epistemic and ethical value for life. (shrink)

Sartre's experimentation in February 1935 with the drug mescalin has been well documented by Simone de Beauvoir in her book The Prime of Life. 1 She recalls that Sartre experienced under the influence of the drug not exactly hallucinations, ‘but the objects he looked at changed their appearance in the most horrifying manner:’ [POL 209]. The residual effects of this nightmarish experience left Sartre, not only for several days ‘in a state of deep depression’ [POL 210], but also produced moods (...) that ‘recalled those that had been induced by mescalin.’. (shrink)

In 1938, doctors Eric Guttmann and Walter Maclay, two psychiatrists based at the Maudsley Hospital in London, administered the hallucinogenic drug mescaline to a group of artists, asking the participants to record their experiences visually. These artists included the painter Julian Trevelyan, who was associated with the British surrealist movement at this time. Published as ‘Mescaline hallucinations in artists’, the research took place at a crucial time for psychiatry, as the discipline was beginning to edge its way into (...) the scientific arena. Newly established, the Maudsley Hospital received Jewish émigrés from Germany to join its ranks. Sponsored by the Rockefeller Foundation, this group of psychiatrists brought with them an enthusiasm for psychoactive drugs and visual media in the scientific study of psychopathological states. In this case, Guttmann and Maclay enlisted the help of surrealist artists, who were harnessing hallucinogens for their own revolutionary aims. Looking behind the images, particularly how they were produced and their legacy today, tells a story of how these groups cooperated, and how their overlapping ecologies of knowledge and experience coincided in these remarkable inscriptions. (shrink)

The Netherne Hospital in Surrey is perhaps the most prestigious site in the history of British art therapy, associated with the key figures Edward Adamson and Eric Cunningham Dax, whose pioneering work involved the setting-up of a large studio for psychiatric patients to create expressive paintings. What is little-known, however, is the work of the designated scientist for psychiatric research, Hungarian Jewish émigré Francis Reitman, who was charged with an overall scientific analysis of the artistic products of the studio. Schooled (...) in the biological psychiatric tradition of Ladislas J. Meduna in Budapest prior to his exile to the Maudsley Hospital in 1938 – and committed to treatments such as leucotomy and electro-convulsive therapy (ECT) – Reitman was an unusual candidate for research into the unconscious processes behind art and psychosis. Yet he authored two highly popular and widely reviewed books on his analyses of the abundant artistic output created by patients with schizophrenic diagnoses at the Netherne. In his Psychotic Art (1950) and Insanity, Art and Culture (1954), Reitman compared such schizophrenic images with those produced by artists under the influence of mescaline and examined the artistic output of patients having undergone leucotomy. This article draws on archival materials and Reitman’s original research publications in order to reconstruct his theory of schizophrenic art within the complex context of postwar British psychiatry, negotiating as he did between biologically reductive understandings of Freudian and Jungian psychoanalytic categories, and ultimately synthesizing concepts from both. It also analyses Reitman’s implicit theory of the therapeutic mechanism of art in the treatment of psychiatric patients. (shrink)

We are currently living through a period of ‘psychedelic renaissance’, with an increased interest, both in clinical research and in society at large, in the use of psychedelic substances such as LSD, psylocybin, DMT and mescaline. This interest, however, has recently led to an increased influx of venture capital and a fast emerging psychedelic start-up ecosystem. In this article, I will discuss the metaphysical presuppositions of this psychedelic renaissance, and examine how these constitute the ‘pitfalls’ of a psychedelics ideology. (...) I will argue in favour of a new materialism, by and large inspired by Deleuze and Guattari, as a more suitable metaphysical framework to understand psychedelics. New materialism implies both a monistic as well as a political framework, in which the challenges of cognitive capitalism vis-à-vis the psychedelic renaissance can be framed more accurately. (shrink)

In Sartre and the Drug Connection, Carole Haynes-Curtis claims that previous commentators on the philosopher's writings have failed to recognize the significance of the impact of a mescalin experiment on Sartre's early philosophical perspective. ‘The residual effects of this nightmarish experience’, Haynes-Curtis claims, ‘haunted him for many years to come’, and was essentially the result of Sartre undergoing what, in modern parlance, is sometimes called a ‘Bad Trip’.

A theologian answers the question: What is the relationship between the hallucinogenic drugs, such as hashish, marihuana, mescaline, psilocybin, LSD, and both mysticism and morality?

Can the use of psychedelic drugs induce lasting changes in metaphysical beliefs? While it is popularly believed that they can, this question has never been formally tested. Here we exploited a large sample derived from prospective online surveying to determine whether and how beliefs concerning the nature of reality, consciousness, and free‑will, change after psychedelic use. Results revealed significant shifts away from ‘physicalist’ or ‘materialist’ views, and towards panpsychism and fatalism, post use. With the exception of fatalism, these changes endured (...) for at least 6 months, and were positively correlated with the extent of past psychedelic‑use and improved mental‑health outcomes. Path modelling suggested that the belief‑shifts were moderated by impressionability at baseline and mediated by perceived emotional synchrony with others during the psychedelic experience. The observed belief‑shifts post‑psychedelic‑use were consolidated by data from an independent controlled clinical trial. Together, these findings imply that psychedelic‑use may causally influence metaphysical beliefs—shifting them away from ‘hard materialism’. We discuss whether these apparent effects are contextually independent. (shrink)

Botanical preparations used by shamans in rituals for divination, prophecy, and ecstasy contain widely different psychoactive compounds, which are incorrectly classified under a single denomination such as “hallucinogens,” “psychedelics,” or “entheogens.” Based on extensive ethnopharmacological search, I proposed a psychopharmacological classification of magic plants in 1979. This paper re-evaluates this taxonomy in the context of consciousness research. Several groups of psychodysleptic magic plants are proposed: (1) hallucinogens—psilocybin mushrooms, mescaline cacti, dimethyltryptamine snuffs, and the synthetic ergoline lysergic acid diethylamide induce (...) strong perceptual changes, affective intensification, and cognitive enhancement. Their ethnobotanical uses include long lasting divination rituals, prophecy, and sacramental practice. (2) Trance-inducers—ergoline Convolvulaceae and South American Banisteriopsis produce quietness, abstraction, lethargy, mild sensorial and cognitive changes, and salient visual imagery changes used in trance rituals and specific divination practices. (3) Cognodysleptics—marijuana (tetrahydrocannabinol) and other terpene-containing plants induce changes in thought, imagination, and affective functions and are used in short-term divination or oneiromancy. (4) Deliriants—tropane-containing Solanaceae, wild tobacco, and Amanita muscaria (muscimol) induce a delirium characterized by dim and clouded consciousness, stupor, confusion, disorientation, perception distortion, difficulties in recollection, anxiety, irritability, excitation, and behavioral disorganization employed in sorcery, purification, or exorcism rituals. The core mental effects required for a drug to be used in shamanistic rituals include light-headedness, enhanced imagery, and experience intensification. This constellation was the reason why, in his classification of psychoactive compounds, the pioneer German psychopharmacologist Louis Lewin established in 1924 a group of drugs under the appropriate name of Phantastica. (shrink)

This chapter contains sections titled: “How can these things be?” Reason's Transcendental Climb Where Were We?

In this précis I summarise the main ideas of my book Philosophy of Psychedelics. The book discusses philosophical issues arising from the therapeutic use of “classic” psychedelic drugs such as psilocybin and LSD. The book is organised around what I call the Comforting Delusion Objection to psychedelic therapy: the concern that this novel and promising treatment relies essentially on the induction of non-naturalistic metaphysical beliefs, rendering it epistemically objectionable. I begin the précis by summarizing material from chapters two and three (...) of the book, which review evidence for the therapeutic efficacy of psychedelics, and the facts about their clinical use that prompt the Comforting Delusion Objection. I then summarize materials from chapters four and five of the book, which argue that psychedelic therapy works neither by experience-independent processes of neuroplasticity, nor by inducing non-naturalistic metaphysical ideations, but by altering mental representations of the self. Next, I summarise the specific, speculative account of how this might work that is developed in chapters six and seven of the book. This account is based on the predictive processing theory of brain function and the self-binding theory of self-representation. Chapters eight and nine of the book argue, on the basis of this account, that psychedelic therapy can have significant epistemic and spiritual benefits that are compatible with a naturalistic worldview. I summarize this material, and then, finally, the overall conclusions about psychedelic therapy drawn in the tenth and final chapter of the book. (shrink)

Recent scientific research suggests that altered states of consciousness induced by classic psychedelic drugs can cause durable psychological benefits in both healthy and patient populations. The phenomenon of ‘psychedelic transformation’ has many philosophically provocative aspects, not least of which is the claim commonly made by psychedelic subjects that their transformation is centrally due to some kind of learning or knowledge gain. Can psychedelic experiences really be a source of knowledge? From the vantage point of philosophical materialism or naturalism, a negative (...) answer is tempting because psychedelic subjects often claim drug-facilitated knowledge of non-natural, transcendent realities. This fact, combined with common conceptions of these drugs as ‘hallucinogenic’ or ‘psychotomimetic’, invites the conclusion that claims of epistemic benefit from psychedelic experience are uniformly false. However, several recent proposals have been made in the literature about naturalistically acceptable epistemic benefits that might arise from psychedelic use. In this chapter I review these proposals, classifying them in accordance with standard epistemological categories, and discuss the arguments for and against them. I also offer some suggestions for future research. (shrink)

Sartre's phobia of crabs is traced through his experimental experience with mescaline and such literary works as _Nausea_, _The Words_ and _The Condemned of Altona_. The phobia is analysed through an examination of Sartre's biphasic childhood Oedipus complex and attendant castration anxiety relating to his mother, father and stepfather. Finally, the question is raised of what the existence of unconscious phobias might imply about the relations between existentialism and psychoanalysis.

Sartre's experimentation in February 1935 with the drug mescalin has been well documented by Simone de Beauvoir in her book The Prime of Life.1 She recalls that Sartre experienced under the influence of the drug not exactly hallucinations, ‘but the objects he looked at changed their appearance in the most horrifying manner:’ [POL 209]. The residual effects of this nightmarish experience left Sartre, not only for several days ‘in a state of deep depression’ [POL 210], but also produced moods that (...) ‘recalled those that had been induced by mescalin.’. (shrink)

“Classic”, serotonergic psychedelic drugs such as LSD and psilocybin are the objects of renewed attention in science and psychiatry. A recent spate of research has produced evidence that psychedelics might be safe and effective adjuncts to the treatment of mood and addictive disorders, agents of positive psychological change in healthy subjects, and valuable tools for studying the neural mechanisms of perception and cognition. This chapter surveys three philosophical debates that have arisen in response to this “renaissance” of psychedelic research. The (...) first concerns the mechanisms of psychedelic-assisted psychotherapy (“psychedelic therapy”): How, exactly, does psychedelic administration in controlled conditions cause lasting psychological benefits? The second concerns the implications of psychedelic research for the philosophy of mind: Does psychedelic evidence show that there can be conscious mental states lacking all forms of self-consciousness? The third concerns the epistemic status of the psychedelic state: Is it possible that certain kinds of knowledge, or other epistemic benefits, could be gained by undergoing a psychedelic experience? (shrink)

Serotonergic (or “classic”) psychedelics have struck many researchers as raising significant philosophical questions that, until recently, were largely unexplored by academic philosophers. This paper provides an overview of four emerging lines of research at the intersection of academic philosophy and psychedelic science that have gained considerable traction in the last decade: selfless consciousness, psychedelic epistemology, psychedelic ethics, and spiritual/religious naturalism. In this paper, we highlight philosophical questions concerning (i) psychedelics, self-consciousness, and phenomenal consciousness, (ii) the epistemic profile of the psychedelic (...) experience; (iii) ethical concerns about the appropriate use of psychedelics; and (iv) whether spiritual or religious dimensions of psychedelic use are compatible with a naturalistic worldview. (shrink)