Thursday, March 29, 2012

A Brief Tour of Human Consciousness: From Impostor Poodles to Purple Numbers Review

A Brief Tour of Human Consciousness: From Impostor Poodles to Purple Numbers
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I attended the 2005 Skeptics Society conference on Brain, Mind, and Consciousness at Caltech, where Ramachandran had been scheduled to speak but was unable to do so because of a family emergency. Although I was not previously familiar with his work, the description led me to believe he was a speaker I would be interested in hearing, and this book, which I purchased at the conference, provides a strong case for that. I've long had an interest in philosophy of mind and cognitive science, and minored in cognitive science in my Ph.D. studies (never completed) at the University of Arizona. I've been out of academia for 11 years now, and apart from reading occasional works like Daniel Dennett's Consciousness Explained and Freedom Evolves, I've not been keeping close tabs on the field. The conference and this book were quite a pleasure--it is clear that there have been some significant developments over the last decade.
It is hard to believe that there are still people who think the brain is little more than a radio receiver, a set of mechanical controls for a disembodied spirit to manipulate the body. Ramachandran's book--like the case studies of Oliver Sacks and A.N. Luria--shows how wrongheaded that view is.
This is a thin (112 pages of text, 45 pages of notes), very accessible and entertaining book. If you enjoy the works of Sacks and Luria, you are likely to enjoy this as well. This is not a collection of case studies, though there are some descriptions of particular patients--it is written from a higher elevation, bringing together recent results, explaining unusual phenomena, and speculating about how those phenomena may tie in to a further understanding of the details of the brain's function.
The book came from Ramachandran's BBC Reith lectures, so it is for a popular audience, with the notes providing some more underlying detail. There are five chapters, each dealing with a single topic. The first chapter is about amputees who experience pain in their "phantom limbs" and how the parts of the brain which had been devoted to the now-absent limbs can become mapped to still-present parts of the body which are handled by physically proximate parts of the brain. For example, a patient whose left arm had been amputated could feel contact to the nonexistent fingers of his left hand from touches to parts of his face or upper arm. Ramachandran then uses this remapping phenomenon to speculate about the causes of Capgras' syndrome (where a patient believes people he knows have been replaced withimpostors), synesthesia, and pain asymbolia, where a patient responds to pain stimulus with laughter.
The second chapter is about vision, and specifically about the phenomena of blindsight (where a person has no experience of seeing, but at an unconscious level does see), hemisphere neglect, and mirror agnosia. In this chapter Ramachandran discusses "mirror neurons," neurons found in monkeys which activate when a monkey performs some task, but also when the monkey sees another monkey perform the same task.
The third chapter, "The Artful Brain," is the most speculative, and provides Ramachandran's suggested ten "universal laws of art," which he offers as features we find aesthetically pleasing in art, and discusses some reasons why those features might be pleasing to the brain.
The fourth chapter deals in more detail with synesthesia, the perception of stimuli with multiple senses, such as experiencing colors corresponding with sounds or numbers. He links this to cross-activation of sites in the brain (similar to his discussion in the first chapter), points out some similar phenomena that most people share (such as a tendency to associate certain kinds of abstract shapes with certain sounds or names), and speculates that such associations may have paved the way for the evolution of language from non-verbal communication.
The fifth and final chapter is titled "Neuroscience--The New Philosophy." Ramachandran discusses how some of the phenomena of neuroscience might bear on questions from philosophy of mind about qualia, free will, and self-awareness. The chapter doesn't get very deep into any of these philosophical issues, but it's clear that more has been learned in the last few decades of neuroscience than in the last few millenia of philosophy.
I highly recommend this book as an introduction to these topics.

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