This article supplements our earlier paper on synaesthesia published in JCS. We discuss the phenomenology of synaesthesia in greater detail, raise several new questions that have emerged from recent studies, and suggest some tentative answers to these questions.

Challenging and rewarding in equal measure, _Phenomenology of Perception_ is Merleau-Ponty's most famous work. Impressive in both scope and imagination, it uses the example of perception to return the body to the forefront of philosophy for the first time since Plato. Drawing on case studies such as brain-damaged patients from the First World War, Merleau-Ponty brilliantly shows how the body plays a crucial role not only in perception but in speech, sexuality and our relation to others.

Challenging and rewarding in equal measure, _Phenomenology of Perception_ is Merleau-Ponty's most famous work. Impressive in both scope and imagination, it uses the example of perception to return the _body_ to the forefront of philosophy for the first time since Plato. Drawing on case studies such as brain-damaged patients from the First World War, Merleau-Ponty brilliantly shows how the body plays a crucial role not only in perception but in speech, sexuality and our relation to others. Perhaps above all, Merleau-Ponty's (...) insights about the embodied mind are a bold and refreshing challenge to the new era of virtual reality and artificial intelligence, as scientists and psychologists discover the centrality of the body to mind and intelligence. (shrink)

Challenging and rewarding in equal measure, _Phenomenology of Perception_ is Merleau-Ponty's most famous work. Impressive in both scope and imagination, it uses the example of perception to return the body to the forefront of philosophy for the first time since Plato. Drawing on case studies such as brain-damaged patients from the First World War, Merleau-Ponty brilliantly shows how the body plays a crucial role not only in perception but in speech, sexuality and our relation to others.

"The Tao that can be spoken of is not the real Way," reads a famous line from the Tao-te-ching. But although the Tao cannot be described by words, words can allow us to catch a fleeting glimpse of that mysterious energy of the universe which is the source of life. The readings in this book are a beginner's entree into the vast treasury of writings from the sacred Chinese tradition, consisting of original translations of excerpts from the Taoist canon. Brief (...) introductions and notes on the translation accompany the selections from the classics; books of devotional and mystical Taoism; texts of internal alchemy; stories of Taoist immortals, magicians, and sorcerers; ethical tracts; chants and rituals; and teachings on meditation and methods of longevity. (shrink)

A pioneering study of the phenomenology of the special state of mind induced by Ayahuasca, a plant-based Amazonian psychotropic brew. The author's research is based both on extensive firsthand experiences with Ayahuasca, and on interviews conducted with a large number of informants coming from different places and backgrounds.

Functionalism offers an account of the relations that hold between behavioural functions, information and neural processing, and conscious experience from which one can draw two inferences: for any discriminable difference between qualia there must be an equivalent discriminable difference in function; and for any discriminable functional difference within a behavioural domain associated with qualia, there must be a discriminable difference between qualia. The phenomenon of coloured hearing synaesthesia appears to contradict the second of these inferences. We report data showing that (...) this form of synaesthesia is genuine and probably results from an aberrant projection from cortical language areas to a region specialized for the perception of colour. Since functionalism purports to be a general account of consciousness, one such negative instance, if it can be further sustained empirically, is sufficient to invalidate it. (shrink)

We studied two otherwise normal, synaesthetic subjects who `saw' a speci¢c colour every time they saw a speci¢c number or letter. We conducted four experiments in order to show that this was a genuine perceptual experience rather than merely a memory association. (i)The synaesthetically induced colours could lead to perceptual grouping, even though the inducing numerals or letters did not. (ii)Synaesthetically induced colours were not experienced if the graphemes were presented peripherally. (iii)Roman numerals were ine¡ective: the actual number grapheme was (...) required. (iv)If two graphemes were alternated the induced colours were also seen in alternation. However, colours were no longer experienced if the graphemes were alternated at more than 4 Hz. We propose that grapheme colour synaesthesia arises from `cross-wiring' between the `colour centre' (area V4 or V8)and the `number area', both of which lie in the fusiform gyrus. We also suggest a similar explanation for the representation of metaphors in the brain: hence, the higher incidence of synaesthesia among artists and poets. (shrink)

This paper juxtaposes Asian spiritual narratives on meditation alongside medical and scientific narratives that emphasize meditation's efficacy in mitigating distress and increasing well-being. After proposing a working definition of meditation that enables it usefully to be distinguished from categories of similar practices such as prayer, I examine meditation's role in Mind/Body medicine in the West. Here, I survey a number of scientific studies of meditation, including the work of Dr. Herbert Benson and his colleagues who examine a meditational variant they (...) call the ‘Relaxation Response', to examine the breadth of efficacy claims made on behalf of the complex and multidimensional grouping of diverse practices we have come to as ‘meditation'. Among other positive outcomes, meditation has been credited with reducing blood pressure, anxiety, addiction, and stress, while Relaxation Response has been shown to decrease sympathetic nervous system activity, metabolism, pain, anxiety, depression, hostility, and stress. I conclude the paper by suggesting that findings from cognitive neuroscience on the subject of visual imagery can be used to elucidate genres of meditative practice that focus on internal visualization sequences, and I use practices from the Rnying ma tradition of Tibetan Buddhism to illustrate why certain integral aspects of meditation forever will remain beyond scientific grasp. (shrink)

The article on synaesthesia by Ramachandran and Hubbard is comprehensive and intellectually stimulating. In this commentary, I would like to present some empirical data not discussed in R&H and to raise some theoretical questions relating to ideas proposed in this article. My comments will be divided into three sections, or - rather - three stories, which correspond to three, independent and different, occasions in my career in which I found myself dealing with synaesthesia. Each of these stories carries a moral (...) that adds to the picture of synaesthesia drawn in R&H. (shrink)