9780143036227

Descartes' Error: Emotion, Reason, And the Human Brain

by
  • ISBN13:

    9780143036227

  • ISBN10:

    014303622X

  • Edition: 1st
  • Format: Paperback
  • Copyright: 2005-09-27
  • Publisher: Penguin Books

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Summary

In the centuries since Descartes famously proclaimed, 'I think, therefore I am, ' science has often overlooked emotions as the source of a person's true being. Even modern neuroscience has tended until recently to concentrate on the cognitive aspects of brain function, disregarding emotions. This attitude began to change with the publication of Descartes' Error. Antonio Damasio challenged traditional ideas about the connection between emotions and rationality. In this wonderfully engaging book, Damasio takes the reader on a journey of scientific discovery through a series of case studies, demonstrating what many of us have long suspected: emotions are not a luxury, they are essential to rational thinking and to normal social behaviour.

Author Biography

Antonio Damasio, a neurologist and neuroscientist, is at the University of Southern California, where he directs a new brain research institute dedicated to the study of emotion and creativity. He is also an adjunct professor at the Salk Institute. The recipient of numerous awards (several shared with his wife Hanna Damasio, also a neurologist and neuroscientist), he is a member of the Institute of Medicine of the National Academy of Sciences and a fellow of the American Academy of Arts and Sciences. He is the author of two other widely acclaimed books, The Feeling of What Happens and Looking for Spinoza.

Table of Contents

Preface ix
Introduction xv
PART I
Chapter 1 Unpleasantness in Vermont
3(17)
Phineas P. Gage.
Gage Was No Longer Gage.
Why Phineas Gage?
An Aside on Phrenology.
A Landmark by Hindsight
Chapter 2 Gage's Brain Revealed
20(14)
The Problem.
An Aside on the Anatomy of Nervous Systems.
The Solution
Chapter 3 A Modern Phineas Gage
34(18)
A New Mind.
Responding to the Challenge.
Reasoning and Deciding
Chapter 4 In Colder Blood
52(31)
Evidence from Other Cases of Prefrontal Damage.
Evidence from Damage Beyond Prefrontal Cortices.
A Reflection on Anatomy and Function.
A Fountainhead.
Evidence from Animal Studies.
An Aside on Neurochemical Explanations.
Conclusion
PART II
Chapter 5 Assembling an Explanation
83(31)
A Mysterious Alliance.
Of Organisms, Bodies, and Brains.
States of Organisms.
Body and Brain Interact: The Organism Within.
Of Behavior and Mind.
Organism and Environment Interact: Taking On the World Without.
An Aside on the Architecture of Neural Systems.
An Integrated Mind from Parcellated Activity.
Images of Now, Images of the Past, and Images of the Future.
Forming Perceptual Images.
Storing Images and Forming Images in Recall.
Knowledge Is Embodied in Dispositional Representations.
Thought Is Made Largely of Images.
Some Words on Neural Development
Chapter 6 Biological Regulation and Survival
114(13)
Dispositions for Survival.
More on Basic Regulation.
Tristan, Isolde, and the Love Potion.
Beyond Drives and Instincts
Chapter 7 Emotions and Feelings
127(38)
Emotions.
The Specificity of Neural Machinery Behind the Emotions.
Feelings.
Fooling the Brain.
Varieties of Feelings.
The Body as Theater for the Emotions.
Minding the Body.
The Process of Feeling
Chapter 8 The Somatic-Marker Hypothesis
165(40)
Reasoning and Deciding.
Reasoning and Deciding in a Personal and Social Space.
Rationality at Work.
The Somatic-Marker Hypothesis.
An Aside on Altruism.
Somatic Markers: Where Do They All Come From?
A Neural Network for Somatic Markers.
Somatic Markers: Theater in the Body or Theater in the Brain?
Overt and Covert Somatic Markers.
Intuition.
Reasoning Outside the Personal and Social Domains.
The Help of Emotion, for Better and for Worse.
Beside and Beyond Somatic Markers.
Biases and the Creation of Order
PART III
Chapter 9 Testing the Somatic-Marker Hypothesis
205(18)
To Know but Not to Feel.
Risk Taking: The Gambling Experiments.
Myopia for the Future.
Predicting the Future: Physiological Correlates
Chapter 10 The Body-Minded Brain
223(22)
No Body, Never Mind.
The Body as Ground Reference.
The Neural Self
Chapter 11 A Passion for Reasoning
245(8)
Descartes' Error
Postscriptum 253(16)
The Human Heart in Conflict.
Modern Neurobiology and the Idea of Medicine.
A Note on the Limits of Neurobiology Now.
Leverage for Survival
Notes and References 269(24)
Further Reading 293(6)
Acknowledgments 299(2)
Index 301

Excerpts

Chapter One: Unpleasantness in Vermont

Phineas P. Gage

It is the summer of 1848. We are in New England. Phineas P Gage, twenty-five years old, construction foreman, is about to go from riches to rags. A century and a half later his downfall will still be quite meaningful.

Gage works for the Rutland & Burlington Railroad and is in charge of a large group of men, a "gang" as it is called, whose job it is to lay down the new tracks for the railroad's expansion across Vermont. Over the past two weeks the men have worked their way slowly toward the town of Cavendish; they are now at a bank of the Black River. The assignment is anything but easy because of the outcrops of hard rock. Rather than twist and turn the tracks around every escarpment, the strategy is to blast the stone and make way for a straighter and more level path. Gage oversees these tasks and is equal to them in every way. He is five-foot-six and athletic, and his movements are swift and precise. He looks like a young Jimmy Cagney, a Yankee Doodle dandy dancing his tap shoes over ties and tracks, moving with vigor and grace.

In the eyes of his bosses, however, Gage is more than just another able body. They say he is "the most efficient and capable" man in their employ.- This is a good thing, because the job takes as much physical prowess as keen concentration, especially when it comes to preparing the detonations. Several steps have to be followed, in orderly fashion. First, a hole must be drilled in the rock. After it is filled about halfway with explosive powder, a fuse must be inserted, and the powder covered with sand. Then the sand must be "tampedin," or pounded with a careful sequence of strokes from an iron rod. Finally, the fuse must be lit. If all goes well, the powder will explode into the rock; the sand is essential, for without its protection the explosion would be directed away from the rock. The shape of the iron and the way it is played are also important. Gage, who has had an iron manufactured to his specifications, is a virtuoso of this thing.

Now for what is going to happen. It is four-thirty on this hot afternoon. Gage has just put powder and fuse in a hole and told the man who is helping him to cover it with sand. Someone calls from behind, and Gage looks away, over his right shoulder, for only an instant. Distracted, and before his man has poured the sand in, Gage begins tamping the powder directly with the iron bar. In no time he strikes fire in the rock, and the charge blows upward in his face.

The explosion is so brutal that the entire gang freezes on their feet. It takes a few seconds to piece together what is going on. The bang is unusual, and the rock is intact. Also unusual is the whistling sound, as of a rocket hurled at the sky. But this is more than fireworks. It is assault and battery. The iron enters Gage's left cheek, pierces the base of the skull, traverses the front of his brain, and exits at high speed through the top of the head. The rod has landed more than a hundred feet away, covered in blood and brains. Phineas Gage has been thrown to the ground. He is stunned, in the afternoon glow, silent but awake. So are we all, helpless spectators.

"Horrible Accident" will be the predictable headline in the Boston Daily Courier and Daily Journal of September 20, a week later. "Wonderful Accident" will be the strange headline in the Vermont Mercury of September 22. "Passage of an Iron Rod Through the Head" will be the accurate headline in the Boston Medical and Surgical Journal. From the matter-of-factness with which they tell the story, one would think the writers were familiar with Edgar Allan Poe's accounts of the bizarre and the horrific. And perhaps they were, although this is not likely; Poe's gothic tales are not yet popular, and Poe himself will die the next year, unknown and impecunious. Perhaps the horrible is just in the air.

Noting how surprised people were that Gage was not killed instantly, the Boston medical article documents that "immediately after the explosion the patient was thrown upon his back"; that shortly thereafter he exhibited "a few convulsive motions of the extremities," and "spoke in a few minutes"; that "his men (with whom he was a great favourite) took him in their arms and carried him to the road, only a few rods distant (a rod is equivalent to 5 1/2 yards, or 16 1/2 feet), and sat him into an ox cart, in which he rode, sitting erect, a full three quarters of a mile, to the hotel of Mr. Joseph Adams"; and that Gage "got out of the cart himself, with a little assistance from his men."

Let me introduce Mr. Adams. He is the justice of the peace for Cavendish and the owner of the town's hotel and tavern. He is taller than Gage, twice as round, and as solicitous as his Falstaff shape suggests. He approaches Gage, and immediately has someone call for Dr. John Harlow, one of the town physicians. While they wait, I imagine, he says, "Come, come, Mr. Gage, what have we got here?" and, why not, "My, my, what troubles we've seen." He shakes his head in disbelief and leads Gage to the shady part of the hotel porch, which has been described as a "piazza." That makes it sound grand and spacious and open, and perhaps it is grand and spacious, but it is not open; it is just a porch. And there perhaps Mr. Adams is now giving Phineas Gage lemonade, or maybe cold cider.

An hour has passed since the explosion. The sun is declining and the heat is more bearable.

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