How the Mind Works

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In this delightful, acclaimed bestseller, one of the world's leading cognitive scientists tackles the workings of the human mind. What makes us rational-and why are we so often irrational? How do we see in three dimensions? What makes us happy, afraid, angry, disgusted, or sexually aroused? Why do we fall in love? And how do we grapple with the imponderables of morality, religion, and consciousness? How the Mind Works synthesizes the most satisfying explanations of our mental life from cognitive science, ...

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Scranton, Pennsylvania, U.S.A. 1999 Paperback New 0393318486. FLAWLESS COPY, BRAND NEW, PRISTINE, NEVER OPENED-672 pp. --In this extraordinary bestseller, Steven Pinker, one of ... the world's leading cognitive scientists, does for the rest of the mind what he did for language in his 1994 book, The Language Instinct. He explains what the mind is, how it evolved, and how it allows us to see, think, feel, laugh, interact, enjoy the arts, and ponder the mysteries of life. And he does it with the wit that prompted Mark Ridley to write in the New York Times Book Review, "No other science writer makes me laugh so much....[Pinker] deserves the superlatives that are lavished on him." The arguments in the book are as bold as its title. Pinker rehabilitates some unfashionable ideas, such as that the mind is a computer and that human nature was shaped by natural selection, and challenges fashionable ones, such as that passionate emotions are irrational, that parents socialize their children, and that nature is good and m Read more Show Less

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Overview

In this delightful, acclaimed bestseller, one of the world's leading cognitive scientists tackles the workings of the human mind. What makes us rational-and why are we so often irrational? How do we see in three dimensions? What makes us happy, afraid, angry, disgusted, or sexually aroused? Why do we fall in love? And how do we grapple with the imponderables of morality, religion, and consciousness? How the Mind Works synthesizes the most satisfying explanations of our mental life from cognitive science, evolutionary biology, and other fields to explain what the mind is, how it evolved, and how it allows us to see, think, feel, laugh, interact, enjoy the arts, and contemplate the mysteries of life. This new edition of Pinker's bold and buoyant classic is updated with a new foreword by the author.

"The author of The Language Instinct explains how the mind developed through natural selection and why we view certain situations positively or negatively...combines explanations proposed by cognitive science and evolutionary biology."

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Editorial Reviews

Discover
A guided tour of the inner recesses of your psyche, which looks less like the Freudian house of horrors than a house of mirror. Written with...literary flair.
Publishers Weekly - Publisher's Weekly
In The Language Instinct, Pinker demonstrated that the mind is structured for the learning and producing of language. Here, the director of the Center for Cognitive Neuroscience at MIT widens his scope, explaining the structure of the mind in much of its emotional, perceptive, sexual, problem-solving splendor. He masterfully consolidates decades of research into an integrated "computational theory of mind" that encompasses the range of activities we ascribe to our "mental organ." The theory posits modules (or automatically triggered "agents") made of massively interconnected neurons firing in patterned sequences. These agents act as information processors that break down complicated tasks as diverse as detecting visual edges, finding footholds and feeling disgust. A new twist is the proposition that this system, like language, developed via natural selection to solve specific problems confronting our hunting-and-gathering ancestors. The discussion is thus split between describing how the computation of specific tasks might actually work, as the chapter on vision does superbly, and less computationally demonstrable and thus less concrete discussions of how emotions are adapted to group relations, or of the sort of data one considers when choosing a mate. Though clearly written, the book will be mistaken by few for high literature ("so far this might not sound much better than the barf-up-your-baby theory"), and, while Pinker deliberately leaves many fundamental questions about the mind largely unanswered (such as the origins of sentience and the sense of self), he has a gift for making enormously complicated mechanisms-and human foibles-accessible, and he offers a truly comprehensive vision of how number crunching allowed the seeing, hearing and feeling human parts to evolve within a wondrous, modularized and goal-directed whole.
Discover
A guided tour of the inner recesses of your psyche, which looks less like the Freudian house of horrors than a house of mirror. Written with...literary flair.
Kirkus Reviews
With verve and clarity, the author of The Language Instinct offers a thought-challenging explanation of why our minds work the way they do. Pinker, director of the Center for Cognitive Neuroscience at MIT, synthesizes cognitive science and evolutionary biology to present the human mind as a system of mental modules designed to solve the problems faced by our evolutionary ancestors in their foraging way of life, i.e., understanding and outmaneuvering objects, animals, plants, and other people. He brings together two theories: the computational theory of mind, which says that the processing of information, including desires and beliefs, is the fundamental activity of the brain, and the theory of natural selection. He suggests that four traits of our ancestors may have been prerequisites to the evolution of powers of reasoning: good vision, group living, free hands, and hunting. He believes that human brains, having evolved by the laws of natural selection and genetics, now interact according to laws of cognitive and social psychology, human ecology, and history. He considers in turn perception, reasoning, emotion, social relations, and the so-called higher callings of art, music, literature, religion, and philosophy. (Language is omitted here, having been treated in his earlier work.) What could be heavy going with a less talented guide is an enjoyable expedition with the witty Pinker leading the way. To get his message across he draws on old camp songs, limericks, movie dialogue, optical illusions, logic problems, musical scores, science fiction, and much more. Along the way, he demolishes some cherished notions, especially feminist ones, and has some comforting wordsfor those who struggled through Philosophy 101 (solving philosophical problems is not what the human mind was evolved to do).
Newsday
“Undeniably brilliant.”
Time
“Big, brash, and a lot of fun.”
Wall Street Journal
“Hugely entertaining . . . always sparkling and provoking.”
New York Times Book Review
“Witty popular science that you enjoy reading for the writing as well as for the science.”
Christopher Lehmann-Haupt - New York Times
“Alters completely the way one thinks about thinking . . . its unforeseen consequences probably can't be contained by a book.”
The Economist
“Pinker has a knack for making the profound seem obvious.... A fascinating bag of evolutionary insights.”
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Product Details

  • ISBN-13: 9780393318487
  • Publisher: Norton, W. W. & Company, Inc.
  • Publication date: 1/28/1999
  • Edition description: Reprint
  • Edition number: 1
  • Pages: 672
  • Product dimensions: 6.10 (w) x 9.30 (h) x 1.20 (d)

Meet the Author

Steven Pinker

Steven Pinker is Harvard College Professor and Johnstone Family Professor in the Department of Psychology at Harvard University.

Biography

"When a gifted scientist and a gifted writer are all in one, you have Steven Pinker," writes fellow cognitive scientist Michael S. Gazzaniga. With his crisp prose style and zany, pop culture-inflected sense of humor, the MIT psychology professor has become famed for his ability to turn something like a discussion of regular and irregular verb forms into a rollicking good read.

As a psychology student at McGill University in Montreal, Pinker was drawn to the emergent field of cognitive science: "I found alluring the combination of psychology, computer science, artificial intelligence, the philosophy of mind, and linguistics," he said in a Scientific American interview. He earned his Ph.D. at Harvard, where his mentor was the psychology professor Roger Brown, who was a pioneer in the study of language acquisition and one of the first to apply Noam Chomsky's theories of language to field research. After accepting a post at MIT in 1982, Pinker began studying language acquisition in children, amassing enough data to demonstrate that children have an inborn facility for language.

Pinker's academic works on language development were admired by many of his peers, but in 1994 he sought—and gained—a broader audience with The Language Instinct, which suggests that human language is a biological adaptation, like web-spinning in spiders, rather than (as it is sometimes seen) a cultural invention, like the wheel. Pinker's lively and engaging treatise held tremendous appeal for a popular audience. Michael Coe, writing in The New York Times, called The Language Instinct "A brilliant, witty and altogether satisfying book."

But if humans have an instinct for language, how was that instinct acquired? That question led Pinker to the field of evolutionary psychology, and to the writing of his next book, How the Mind Works. If a particular behavior is common among humans, evolutionary psychologists reason, that behavior probably contributed to the ability of earlier humans to survive and pass along their genes. How the Mind Works, which uses this approach to examine behaviors from music-making to murder, was a finalist for the 1998 Pulitzer Prize and the National Book Award. Following its release, Pinker publicly tangled with Stephen Jay Gould over the scientific legitimacy of evolutionary psychology. Although the two scientists clashed on some issues, Pinker admired Gould's ability to write entertaining explications of complex ideas—"profundity with a light touch," as Pinker wrote in his Time magazine eulogy for Gould.

Pinker's next book, Words and Rules, returned to the subject of language; specifically, it explores the different mechanisms involved in learning regular and irregular verb forms. In a recent book The Blank Slate, Pinker tackled the objections some people have to a biological view of human nature. "There are fears that if you acknowledge that people are born with anything, it implies that some people have more of it than others, and therefore it would open the door to political inequality or oppression, for example," he explained in a New York Times interview. The Blank Slate is Pinker's attempt to demonstrate that there's no inherent contradiction between evolutionary psychology and the concepts of free will and moral behavior. "It's a fallacy to think that hunger and thirst and a sex drive are biological but that reasoning and decision making and learning are something else, something non-biological," he said. "They're just a different kind of biology."

Good To Know

Journalists often comment on Pinker's rock-star mane of curls, and indeed Pinker once flirted with the idea of becoming a rock musician: "I have to confess that watching rock 'n' roll concerts, I did fantasize about being up on stage," he told The Guardian. "Not in the lead. I never wanted to be Mick Jagger. Maybe the bass-player or the drummer. But I never, ever played air guitar."

Research at Pinker's lab, in the Department of Brain and Cognitive Sciences at MIT, focuses on the different mental processes involved in using grammatical rules (e.g., an English plural can be formed by adding –s to the end of a noun) and using exceptions to the rules (e.g., the plural of mouse is not mouses but mice). The lab has undertaken magnetoencephalographic (MEG) studies to identify "the time course of the processing of words and rules in the brain."

Pinker was named among Newsweek's "100 Americans for the Next Century" and included in Esquire's "Register of Outstanding Men and Women."

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    1. Hometown:
      Boston, Massachusetts
    1. Date of Birth:
      September 18, 1954
    2. Place of Birth:
      Montreal, Canada
    1. Education:
      B.A., McGill University, 1976; Ph.D., Harvard University, 1979
    2. Website:

Read an Excerpt

Why are there so many robots in fiction, but none in real life? I would pay a lot for a robot that could put away the dishes or run simple errands. But I will not have the opportunity in this century, and probably not in the next one either. There are, of course, robots that weld or spray-paint on assembly lines and that roll through laboratory hallways; my question is about the machines that walk, talk, see, and think, often better than their human masters. Since 1920, when Karel Capek coined the word robot in his play R.U.R., dramatists have freely conjured them up: Speedy, Cutie, and Dave in Isaac Asimov's I, Robot, Robbie in Forbidden Planet, the flailing canister in Lost in Space, the daleks in Dr. Who, Rosie the Maid in The Jetsons, Nomad in Star Trek, Hymie in Get Smart, the vacant butlers and bickering haberdashers in Sleeper, R2D2 and C3PO in Star Wars, the Terminator in The Terminator, Lieutenant Commander Data in Star Trek: The Next Generation, and the wisecracking film critics in Mystery Science Theater 3000.

This book is not about robots; it is about the human mind. I will try to explain what the mind is, where it came from, and how it lets us see, think, feel, interact, and pursue higher callings like art, religion, and philosophy. On the way I will try to throw light on distinctively human quirks. Why do memories fade? How does makeup change the look of a face? Where do ethnic stereotypes come from, and when are they irrational? Why do people lose their tempers? What makes children bratty? Why do fools fall in love? What makes us laugh? And why do people believe in ghosts and spirits?

But the gap between robots in imagination and in reality is my starting point, for it shows the first step we must take in knowing ourselves: appreciating the fantastically complex design behind feats of mental life we take for granted. The reason there are no humanlike robots is not that the very idea of a mechanical mind is misguided. It is that the engineering problems that we humans solve as we see and walk and plan and make it through the day are far more challenging than landing on the moon or sequencing the human genome. Nature, once again, has found ingenious solutions that human engineers cannot yet duplicate. When Hamlet says, "What a piece of work is a man! how noble in reason! how infinite in faculty! in form and moving how express and admirable!" we should direct our awe not at Shakespeare or Mozart or Einstein or Kareem Abdul-Jabbar but at a four-year old carrying out a request to put a toy on a shelf.

In a well-designed system, the components are black boxes that perform their functions as if by magic. That is no less true of the mind. The faculty with which we ponder the world has no ability to peer inside itself or our other faculties to see what makes them tick. That makes us the victims of an illusion: that our own psychology comes from some divine force or mysterious essence or almighty principle. In the Jewish legend of the Golem, a clay figure was animated when it was fed an inscription of the name of God. The archetype is echoed in many robot stories. The statue of Galatea was brought to life by Venus' answer to Pygmalion's prayers; Pinocchio was vivified by the Blue Fairy. Modern versions of the Golem archetype appear in some of the less fanciful stories of science. All of human psychology is said to be explained by a single, omnipotent cause: a large brain, culture, language, socialization, learning, complexity, self-organization, neural-network dynamics.

I want to convince you that our minds are not animated by some godly vapor or single wonder principle. The mind, like the Apollo spacecraft, is designed to solve many engineering problems, and thus is packed with high-tech systems each contrived to overcome its own obstacles. I begin by laying out these problems, which are both design specs for a robot and the subject matter of psychology. For I believe that the discovery by cognitive science and artificial intelligence of the technical challenges overcome by our mundane mental activity is one of the great revelations of science, an awakening of the imagination comparable to learning that the universe is made up of billions of galaxies or that a drop of pond water teems with microscopic life.

THE ROBOT CHALLENGE

What does it take to build a robot? Let's put aside superhuman abilities like calculating planetary orbits and begin with the simple human ones: seeing, walking, grasping, thinking about objects and people, and planning how to act.

In movies we are often shown a scene from a robot's-eye view, with the help of cinematic conventions like fish-eye distortion or crosshairs. That is fine for us, the audience, who already have functioning eyes and brains. But it is no help to the robot's innards. The robot does not house an audience of little people--homunculi--gazing at the picture and telling the robot what they are seeing. If you could see the world through a robot's eyes, it would look not like a movie picture decorated with crosshairs but something like this:

Each number represents the brightness of one of the millions of tiny patches making up the visual field. The smaller numbers come from darker patches, the larger numbers from brighter patches. The numbers shown in the array are the actual signals coming from an electronic camera trained on a person's hand, though they could just as well be the firing rates of some of the nerve fibers coming from the eye to the brain as a person looks at a hand. For a robot brain--or a human brain--to recognize objects and not bump into them, it must crunch these numbers and guess what kinds of objects in the world reflected the light that gave rise to them. The problem is humblingly difficult.

First, a visual system must locate where an object ends and the backdrop begins. But the world is not a coloring book, with black outlines around solid regions. The world as it is projected into our eyes is a mosaic of tiny shaded patches. Perhaps, one could guess, the visual brain looks for regions where a quilt of large numbers (a brighter region) abuts a quilt of small numbers (a darker region). You can discern such a boundary in the square of numbers; it runs diagonally from the top right to the bottom center. Most of the time, unfortunately, you would not have found the edge of an object, where it gives way to empty space. The juxtaposition of large and small numbers could have come from many distinct arrangements of matter. This drawing, devised by the psychologists Pawan Sinha and Edward Adelson, appears to show a ring of light gray and dark gray tiles.

In fact, it is a rectangular cutout in a black cover through which you are looking at part of a scene. In the next drawing the cover has been removed, and you can see that each pair of side-by-side gray squares comes from a different arrangement of objects.

Big numbers next to small numbers can come from an object standing in front of another object, dark paper lying on light paper, a surface painted two shades of gray, two objects touching side by side, gray cellophane on a white page, an inside or outside corner where two walls meet, or a shadow. Somehow the brain must solve the chicken-and-egg problem of identifying three-dimensional objects from the patches on the retina and determining what each patch is (shadow or paint, crease or overlay, clear or opaque) from knowledge of what object the patch is part of.

The difficulties have just begun. Once we have carved the visual world into objects, we need to know what they are made of, say, snow versus coal. At first glance the problem looks simple. If large numbers come from bright regions and small numbers come from dark regions, then large number equals white equals snow and small number equals black equals coal, right? Wrong. The amount of light hitting a spot on the retina depends not only on how pale or dark the object is but also on how bright or dim the light illuminating the object is. A photographer's light meter would show you that more light bounces off a lump of coal outdoors than off a snowball indoors. That is why people are so often disappointed by their snapshots and why photography is such a complicated craft. The camera does not lie; left to its own devices, it renders outdoor scenes as milk and indoor scenes as mud. Photographers, and sometimes microchips inside the camera, coax a realistic image out of the film with tricks like adjustable shutter timing, lens apertures, film speeds, flashes, and darkroom manipulations.

Our visual system does much better. Somehow it lets us see the bright outdoor coal as black and the dark indoor snowball as white. That is a happy outcome, because our conscious sensation of color and lightness matches the world as it is rather than the world as it presents itself to the eye. The snowball is soft and wet and prone to melt whether it is indoors or out, and we see it as white whether it is indoors or out The coal is always hard and dirty and prone to burn, and we always see it as black. The harmony between how the world looks and how the world is must be an achievement of our neural wizardry, because black and white don't simply announce themselves on the retina. In case you are still skeptical, here is an everyday demonstration. When a television set is off, the screen is a pale greenish gray. When it is on, some of the phosphor dots give off light, painting in the bright areas of the picture. But the other dots do not suck light and paint in the dark areas; they just stay gray. The areas that you see as black are in fact just the pale shade of the picture tube when the set was off. The blackness is a figment. a product of the brain circuitry that ordinarily allows you to see coal as coal. Television engineers exploited that circuitry when they designed the screen.

The next problem is seeing in depth. Our eyes squash the three-dimensional world into a pair of two-dimensional retinal images, and the third dimension must be reconstituted by the brain. But there are no telltale signs in the patches on the retina that reveal how far away a surface is. A stamp in your palm can project the same square on your retina as a chair across the room or a building miles away (top drawing, page 9). A cutting board viewed head-on can project the same trapezoid as various irregular shards held at a slant (bottom drawing, page 9).

You can feel the force of this fact of geometry, and of the neural mechanism that copes with it, by staring at a lightbulb for a few seconds or looking at a camera as the flash goes off, which temporarily bleaches a patch onto your retina. If you now look at the page in front of you, the afterimage adheres to it and appears to be an inch or two across. If you look up at the wall, the afterimage appears several feet long. If you look at the sky, it is the size of a cloud.

Finally, how might a vision module recognize the objects out there in the world, so that the robot can name them or recall what they do? The obvious solution is to build a template or cutout for each object that duplicates its shape. When an object appears, its projection on the retina would fit its own template like a round peg in a round hole. The template would be labeled with the name of the shape--in this case, "the letter P"--and whenever a shape matches it, the template announces the name:

Alas, this simple device malfunctions in both possible ways. It sees P's that aren't there; for example, it gives a false alarm to the R shown in the first square below. And it fails to see P's that are there; for example, it misses the letter when it is shifted, tilted, slanted, too far, too near, or too fancy:

And these problems arise with a nice, crisp letter of the alphabet. Imagine trying to design a recognizer for a shirt, or a face! To be sure, after four decades of research in artificial intelligence, the technology of shape recognition has improved. You may own software that scans in a page, recognizes the printing, and converts it with reasonable accuracy to a file of bytes. But artificial shape recognizers are still no match for the ones in our heads. The artificial ones are designed for pristine, easy-to-recognize worlds and not the squishy, jumbled real world. The funny numbers at the bottom of checks were carefully drafted to have shapes that don't overlap and are printed with special equipment that positions them exactly so that they can be recognized by templates. When the first face recognizers are installed in buildings to replace doormen, they will not even try to interpret the chiaroscuro of your face but will scan in the hard-edged, rigid contours of your iris or your retinal blood vessels. Our brains, in contrast, keep a record of the shape of every face we know (and every letter, animal, tool. and so on), and the record is somehow matched with a retinal image even when the image is distorted in all the ways we have been examining. In Chapter 4 we will explore how the brain accomplishes this magnificent feat.

Let's take a look at another everyday miracle: getting a body from place to place. When we want a machine to move, we put it on wheels. The invention of the wheel is often held up as the proudest accomplishment of civilization. Many textbooks point out that no animal has evolved wheels and cite the fact as an example of how evolution is often incapable of finding the optimal solution to an engineering problem. But it is not a good example at all. Even if nature could have evolved a moose on wheels, it surely would have opted not to. Wheels are good only in a world with roads and rails. They bog down in any terrain that is soft, slippery, steep, or uneven. Legs are better. Wheels have to roll along an unbroken supporting ridge, but legs can be placed on a series of separate footholds, an extreme example being a ladder. Legs can also be placed to minimize lurching and to step over obstacles. Even today, when it seems as if the world has become a parking lot, only about half of the earth's land is accessible to vehicles with wheels or tracks, but most of the earth's land is accessible to vehicles with feet: animals, the vehicles designed by natural selection.

But legs come with a high price: the software to control them. A wheel, merely by turning, changes its point of support gradually and can bear weight the whole time. A leg has to change its point of support all at once, and the weight has to be unloaded to do so. The motors controlling a leg have to alternate between keeping the foot on the ground while it bears and propels the load and taking the load off to make the leg free to move. All the while they have to keep the center of gravity of the body within the polygon defined by the feet so the body doesn't topple over. The controllers also must minimize the wasteful up-and-down motion that is the bane of horseback riders. In walking windup toys, these problems are crudely solved by a mechanical linkage that converts a rotating shaft into a stepping motion. But the toys cannot adjust to the terrain by finding the best footholds.

Even if we solved these problems, we would have figured out only how to control a walking insect. With six legs, an insect can always keep one tripod on the ground while it lifts the other tripod. At any instant, it is stable. Even four-legged beasts, when they aren't moving too quickly, can keep a tripod on the ground at all times. But as one engineer has put it, "the upright two-footed locomotion of the human being seems almost a recipe for disaster in itself, and demands a remarkable control to make it practicable." When we walk, we repeatedly tip over and break our fall in the nick of time. When we run, we take off in bursts of flight. These aerobatics allow us to plant our feet on widely or erratically spaced footholds that would not prop us up at rest, and to squeeze along narrow paths and jump over obstacles. But no one has yet figured out how we do it.

Controlling an arm presents a new challenge. Grab the shade of an architect's lamp and move it along a straight diagonal path from near you, low on the left, to far from you, high on the right. Look at the rods and hinges as the lamp moves. Though the shade proceeds along a straight line, each rod swings through a complicated arc, swooping rapidly at times, remaining almost stationary at other times, sometimes reversing from a bending to a straightening motion. Now imagine having to do it in reverse: without looking at the shade, you must choreograph the sequence of twists around each joint that would send the shade along a straight path. The trigonometry is frightfully complicated. But your arm is an architect's lamp, and your brain effortlessly solves the equations every time you point. And if you have ever held an architect's lamp by its clamp, you will appreciate that the problem is even harder than what I have described. The lamp flails under its weight as if it had a mind of its own; so would your arm if your brain did not compensate for its weight, solving a near-intractable physics problem.

A still more remarkable feat is controlling the hand. Nearly two thousand years ago, the Greek physician Galen pointed out the exquisite natural engineering behind the human hand. It is a single tool that manipulates objects of an astonishing range of sizes, shapes, and weights, from a log to a millet seed. "Man handles them all," Galen noted, "as well as if his hands had been made for the sake of each one of them alone." The hand can be configured into a hook grip (to lift a pail), a scissors grip (to hold a cigarette), a five-jaw chuck (to lift a coaster), a three-jaw chuck (to hold a pencil), a two-jaw pad-to-pad chuck (to thread a needle), a two-jaw pad-to-side chuck (to turn a key), a squeeze grip (to hold a hammer), a disc grip (to open a jar), and a spherical grip (to hold a ball). Each grip needs a precise combination of muscle tensions that mold the hand into the right shape and keep it there as the load tries to bend it back. Think of lifting a milk carton. Too loose a grasp, and you drop it; too tight, and you crush it; and with some gentle rocking, you can even use the tugging on your fingertips as a gauge of how much milk is inside! And I won't even begin to talk about the tongue, a boneless water balloon controlled only by squeezing, which can loosen food from a back tooth or perform the ballet that articulates words like thrilling and sixths.

"A common man marvels at uncommon things; a wise man marvels at the commonplace." Keeping Confucius' dictum in mind, let's continue to look at commonplace human acts with the fresh eye of a robot designer seeking to duplicate them. Pretend that we have somehow built a robot that can see and move. What will it do with what it sees? How should it decide how to act?

An intelligent being cannot treat every object it sees as a unique entity unlike anything else in the universe. It has to put objects in categories so that it may apply its hard-won knowledge about similar objects, encountered in the past, to the object at hand.

But whenever one tries to program a set of criteria to capture the members of a category, the category disintegrates. Leaving aside slippery concepts like "beauty" or "dialectical materialism," let's look at a textbook example of a well-defined one: "bachelor." A bachelor, of course, is simply an adult human male who has never been married. But now imagine that a friend asks you to invite some bachelors to her party. What would happen if you used the definition to decide which of the following people to invite?

The list, which comes from the computer scientist Terry Winograd, shows that the straightforward definition of "bachelor" does not capture our intuitions about who fits the category.

Knowing who is a bachelor is just common sense, but there's nothing common about common sense. Somehow it must find its way into a human or robot brain. And common sense is not simply an almanac about life that can be dictated by a teacher or downloaded like an enormous database. No database could list all the facts we tacitly know, and no one ever taught them to us. You know that when Irving puts the dog in the car, it is no longer in the yard. When Edna goes to church, her head goes with her. If Doug is in the house, he must have gone in through some opening unless he was born there and never left. If Sheila is alive at 9 A.M. and is alive at 5 P.M., she was also alive at noon. Zebras in the wild never wear underwear. Opening a jar of a new brand of peanut butter will not vaporize the house. People never shove meat thermometers in their ears. A gerbil is smaller than Mt. Kilimanjaro.

An intelligent system, then, cannot be stuffed with trillions of facts. It must be equipped with a smaller list of core truths and a set of rules to deduce their implications. But the rules of common sense, like the categories of common sense, are frustratingly hard to set down. Even the most straightforward ones fail to capture our everyday reasoning. Mavis lives in Chicago and has a son named Fred, and Millie lives in Chicago and has a son named Fred. But whereas the Chicago that Mavis lives in is the same Chicago that Millie lives in, the Fred who is Mavis' son is not the same Fred who is Millie's son. If there's a bag in your car, and a gallon of milk in the bag, there is a gallon of milk in your car. But if there's a person in your car, and a gallon of blood in a person, it would be strange to conclude that there is a gallon of blood in your car.

Even if you were to craft a set of rules that derived only sensible conclusions, it is no easy matter to use them all to guide behavior intelligently. Clearly a thinker cannot apply just one rule at a time. A match gives light; a saw cuts wood; a locked door is opened with a key. But we laugh at the man who lights a match to peer into a fuel tank, who saws off the limb he is sitting on, or who locks his keys in the car and spends the next hour wondering how to get his family out. A thinker has to compute not just the direct effects of an action but the side effects as well.

But a thinker cannot crank out predictions about all the side effects, either. The philosopher Daniel Dennett asks us to imagine a robot designed to fetch a spare battery from a room that also contained a time bomb. Version 1 saw that the battery was on a wagon and that if it pulled the wagon out of the room, the battery would come with it. Unfortunately, the bomb was also on the wagon, and the robot failed to deduce that pulling the wagon out brought the bomb out, too. Version 2 was programmed to consider all the side effects of its actions. It had just finished computing that pulling the wagon would not change the color of the room's walls and was proving that the wheels would turn more revolutions than there are wheels on the wagon, when the bomb went off. Version 3 was programmed to distinguish between relevant implications and irrelevant ones. It sat there cranking out millions of implications and putting all the relevant ones on a list of facts to consider and all the irrelevant ones on a list of facts to ignore, as the bomb ticked away.

An intelligent being has to deduce the implications of what it knows, but only the relevant implications. Dennett points out that this requirement poses a deep problem not only for robot design but for epistemology, the analysis of how we know. The problem escaped the notice of generations of philosophers, who were left complacent by the illusory effortlessness of their own common sense. Only when artificial intelligence researchers tried to duplicate common sense in computers, the ultimate blank slate, did the conundrum, now called "the frame problem," come to light. Yet somehow we all solve the frame problem whenever we use our common sense.

Imagine that we have somehow overcome these challenges and have a machine with sight, motor coordination, and common sense. Now we must figure out how the robot will put them to use. We have to give it motives.

What should a robot want? The classic answer is Isaac Asimov's Fundamental Rules of Robotics, "the three rules that are built most deeply into a robot's positronic brain."

1. A robot may not injure a human being or, through inaction, allow a human being to come to harm.

2. A robot must obey orders given it by human beings except where such orders would conflict with the First Law.

3. A robot must protect its own existence as long as such protection does not conflict with the First or Second Law.

Asimov insightfully noticed that self-preservation, that universal biological imperative, does not automatically emerge in a complex system. It has to be programmed in (in this case, as the Third Law). After all, it is just as easy to build a robot that lets itself go to pot or eliminates a malfunction by committing suicide as it is to build a robot that always looks out for Number One. Perhaps easier; robot-makers sometimes watch in horror as their creations cheerfully shear off limbs or flatten themselves against walls, and a good proportion of the world's most intelligent machines are kamikaze cruise missiles and smart bombs.

But the need for the other two laws is far from obvious. Why give a robot an order to obey orders--why aren't the original orders enough? Why command a robot not to do harm--wouldn't it be easier never to command it to do harm in the first place? Does the universe contain a mysterious force pulling entities toward malevolence, so that a positronic brain must be programmed to withstand it? Do intelligent beings inevitably develop an attitude problem?

In this case Asimov, like generations of thinkers, like all of us, was unable to step outside his own thought processes and see them as artifacts of how our minds were put together rather than as inescapable laws of the universe. Man's capacity for evil is never far from our minds, and it is easy to think that evil just comes along with intelligence as part of its very essence. It is a recurring theme in our cultural tradition: Adam and Eve eating the fruit of the tree of knowledge, Promethean fire and Pandora's box, the rampaging Golem, Faust's bargain, the Sorcerer's Apprentice, the adventures of Pinocchio, Frankenstein's monster, the murderous apes and mutinous HAL of 2001: A Space Odyssey. From the 1950s through the 1980s, countless films in the computer-runs-amok genre captured a popular fear that the exotic mainframes of the era would get smarter and more powerful and someday turn on us.

Now that computers really have become smarter and more powerful, the anxiety has waned. Today's ubiquitous, networked computers have an unprecedented ability to do mischief should they ever go to the bad. But the only mayhem comes from unpredictable chaos or from human malice in the form of viruses. We no longer worry about electronic serial killers or subversive silicon cabals because we are beginning to appreciate that malevolence--like vision, motor coordination, and common sense--does not come free with computation but has to be programmed in. The computer running WordPerfect on your desk will continue to fill paragraphs for as long as it does anything at all. Its software will not insidiously mutate into depravity like the picture of Dorian Gray.

Even if it could, why would it want to? To get--what? More floppy disks? Control over the nation's railroad system? Gratification of a desire to commit senseless violence against laser-printer repairmen? And wouldn't it have to worry about reprisals from technicians who with the turn of a screwdriver could leave it pathetically singing "A Bicycle Built for Two"? A network of computers, perhaps, could discover the safety in numbers and plot an organized takeover--but what would make one computer volunteer to fire the data packet heard round the world and risk early martyrdom? And what would prevent the coalition from being undermined by silicon draft-dodgers and conscientious objectors? Aggression, like every other part of human behavior we take for granted, is a challenging engineering problem!

But then, so are the kinder, gentler motives. How would you design a robot to obey Asimov's injunction never to allow a human being to come to harm through inaction? Michael Frayn's 1965 novel The Tin Men is set in a robotics laboratory, and the engineers in the Ethics Wing, Macintosh, Goldwasser, and Sinson, are testing the altruism of their robots. They have taken a bit too literally the hypothetical dilemma in every moral philosophy textbook in which two people are in a lifeboat built for one and both will die unless one bails out. So they place each robot in a raft with another occupant, lower the raft into a tank, and observe what happens.

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Table of Contents

Foreword vii

Preface xv

1 Standard Equipment 3

2 Thinking Machines 59

3 Revenge of the Nerds 149

4 The Mind's Eye 211

5 Good Ideas 299

6 Hotheads 363

7 Family Values 425

8 The Meaning of Life 521

Notes 567

References 589

Credits 627

Index 629

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Interviews & Essays

Before the live bn.com chat, Steven Pinker agreed to answer some of our questions:

Q: You still teach Psych 101 in addition to your graduate classes. Do you enjoy teaching?

A: Yes. Teaching a large introductory class is a lot like writing a popular science book. You have to weave the facts into a coherent story, present it succinctly, and keep the audience's attention with a well-placed joke or demonstration. Students and readers have little patience for vague ideas masked by a fog of highfalutin verbiage -- they want to know who did what to whom.

Q: Who were some of your scientific and literary influences while growing up in Montreal?

A: Scientific influences: D. O. Hebb, who was an emeritus professor at McGill when I was a student there; Noam Chomsky and B. F. Skinner, via colleagues of theirs who also taught at McGill; and Al Bregman, my senior research advisor, who studies auditory perception.

Literary influences? Vigorous, clear, witty nonfiction writers: Galileo, George Orwell, David Hume, A. J. Ayer, E. B. White. George Miller and Roger Brown, two of the first psycholinguistists (Brown later became my advisor at Harvard). Style manuals by Strunk and White and Theodore Bernstein (look up the entry for "Topsy"). Encyclopedias (the entry for "snakes" in the Britannica is a literary masterpiece).

Q: What are a couple of your favorite television shows? What about movies? Why?

A: TV: Lions chasing wildebeests on the Discovery channel, VH-1, "Seinfeld," "Law and Order," hockey. Why? Because they're all unpredictable. Movies: "The Last Waltz," "The Godfather," "North by Northwest," "Charade," "Raiders of the Lost Ark," "The Maltese Falcon," "To Have and Have Not," "The Shop on Main Street," "Enemies." They have some combination of crisp dialogue, visual wit, great music, and recurring themes of human conflict.

Q: Have you read anything lately that just blew you away?

A: Thomas Sowell's Migrations and Cultures, about why ethnic groups migrate and how they affect their adopted homelands; Diane McGuinness's Why Our Children Can't Read, a fascinating story of the history and psychology of written language and how it is being mistaught in American schools; and Lawrence Keeley's War Before Civilization. Noble savages? Forget it.

Q: What has been your reaction to the list of celebrities whose deviant behavior has been all the news in the past couple of weeks?

A: That means men foolishly pursuing sex with inappropriate women. It shows that a part of the male mind desires sex with a variety of women as an end in itself, and is willing to incur huge costs for it -- costs to the men's reputations, careers, family life, and overall happiness (to say nothing of the well-being of the women). That supports the sexual-selection theory of male sexuality: that for millennia, men with a wandering eye left more descendants, who inherited those wandering eyes. It refutes the theory that men want sex only as a means of attaining prestige -- a reputation for being a manly stud who can accumulate trophies.

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Customer Reviews

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See All Sort by: Showing 1 – 20 of 21 Customer Reviews
  • Anonymous

    Posted August 24, 2003

    I still don't know how the mind works, but who cares! It works!

    Pinker is overwhelmingly entertaining. Everything he says explains something about the society of feelings, about the seeming chaos of mind, about the meaning of life. I don¿t care whether Pinker got it right about our minds. At least we know how his mind works! Gisela Gasper Fitzgerald, author of ADOPTION: An Open, Semi-Open or Closed Practice?

    2 out of 2 people found this review helpful.

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  • Anonymous

    Posted March 15, 2003

    How the mind works....sort of

    This book is quite impressive- very well researched, thorough, provocative, and very well written. Pinker has done an admirable job approaching such a massively complex problem. However, I think he's a little thick on the psychology, and thin on the neuroscience. For example, I'm not sure he mentions the word 'neurotransmitter'. Nonetheless, anyone remotely interested in how the mind works ought to read this book.

    2 out of 2 people found this review helpful.

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  • Anonymous

    Posted April 3, 2008

    Bait and switch writing

    The title of this book, while undoubtedly geared to sell copies, is a vast overstatement of what Mr. Pincker is actually selling. In fact, what we laymen generally refer to as 'mind'--the feeling of sentience and the sense of 'I'--are precisely the faculties that Mr. Pincker admits are currently beyond scientific explanation, indeed which he admits it may be impossible for science to adequately explain. But those admissions are late in the book, while most of the book discusses the current knowledge about how the brain constructs the world from sensory input and how it calculates (thus the bait and switch title to this review). Those descriptions of what science currently knows are actually very informative and worth the price of the book, had the book been adequately edited by the publishing company to remove the grandiose claims and disjointed digressions. Mr. Pincker also trots out a number of old straw men--such as the nonsensical 'Standard Social Science Model'--and then proceeds to cut them down with glee, followed by a wink and a nod to the reader to let us see how very clever he is. So, if you are a good skimmer of books, buy this and pick out the important information. If you are looking for an enjoyable read, then look elsewhere.

    1 out of 3 people found this review helpful.

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  • Anonymous

    Posted December 9, 2007

    If only I knew everything in this book ...

    ... I'd be happy and smarter indeed. Unfortunately, the price to pay for the study is high. Maybe it's because I like to learn more from lists of facts as opposed to wandering through prose - as entertaining as it may be. That said, I have a problem remembering anything in the book for long because there's simply too much information spaced over too many words. Give me a concise textbook anytime. Make no mistake about it however, this guy certainly knows what he's talking about. If you're able to follow the information flow, you'll walk away with a great deal of insight into what you are and why. For that reason alone, I'll probably give the book another read.

    1 out of 1 people found this review helpful.

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  • Anonymous

    Posted July 9, 2006

    A very informative book

    This is the sort of book you dip into when you're feeling curious, or consult when you have a question about the squishy thing inside your head. Pinker knows what he's talking about, and answers most questions people ask about the mind. While it is very long, this is to be expected as the mind is a complicated thing. I recommended this book to a friend in high school because he kept asking me questions about the mind. It is now one of only two books listed in his Myspace page. Despite what people have said, it is not that difficult to read if you have half a brain. All in all, an excellent book.

    1 out of 1 people found this review helpful.

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  • Anonymous

    Posted March 16, 2000

    essay contest

    I, Jeremy T. Clark, think that How The Mind Works by Stephen Pinker was chosen as a part of the Independent Thinkers Series because it is an excellent example of an author pioneering his way through information that is unfamiliar to most by taking a different approach to a subject. He explains the amazing complexity of the human mind and how we use it to plan our actions. Our senses provide all-important input that we accumulate to create the outcome of our decisions. He explains that we as humans, 'wonder about the causes of fortune and misfortune'. Pinker goes on to identify the multiple meanings of life and how they control everything around us. We still maintain beliefs about the supernatural that contradict everything that we really do know about the world, or think that we know. Since the beginning of time, things have been withheld from mainstream knowledge seekers because it may not fit into their current streams of thought that have been intentionally provided by many credible institutions. When more independent critical thinkers that inhabit our world are exposed to an infinity of truths that could be available to them, we can begin to formulate an intelligent scientific hypothesis about each of the anomalies that still baffle us. Pinker concludes that we find pleasure in enlightenment through a vehicle that we call 'the arts'. Passionate seekers of truth can and will decide what facts are actually fiction and which works of fiction are actually closer to being facts.

    1 out of 1 people found this review helpful.

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  • Anonymous

    Posted September 5, 2009

    I Also Recommend:

    Quite comprehensive, not entry level reading

    Plus: there is a LOT of information in this book. It goes quite a bit beyond just describing what we know about brain functions. It is very wordy and can be difficult to read in places. This is probably due to the authors effort to be comprehensive.
    Minus: Its a bit too speculative in some respects. I personally can only hold a few speculative theoretical contexts in my head at a time. I know that is not a problem for some. I also think the author perhaps overemphasizes the natural selection process, or perhaps better said seems to try to make it fit into nearly every aspect of everything.

    Otherwise the book is very informative. Not sorry I bought it

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  • Anonymous

    Posted May 30, 2006

    Boring read

    It takes quite a talent to turn a fascinating subject into such a chore to read. The analogies, digressions and arcane references from unrelated fields are without end. This amounts to the worst of both world a bloated and meandering literary style coupled with an egghead inability to see the woods for the trees.

    0 out of 3 people found this review helpful.

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  • Anonymous

    Posted June 4, 2006

    Ridiculous

    This book was full of information, but at a level that is beyond what many can grasp. It was difficult to read and understand. Not only that but he repeated himself over and over again. He used 565 pages to write about something that he could have written in less then 100 pages in laymen terms. He tried to hard to prove his point by making it more intricate then what it really is. His ideas great his presentation needs serious work. I do not recommend this book at all, if you really want to learn how the mind works look somewhere else. Reading this book is just a waist of time.

    0 out of 4 people found this review helpful.

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  • Anonymous

    Posted March 16, 2006

    My head hurts!!

    Wow...The book was well written. Pinker is obviously a well educated man, but he tries to cram too much material and information into his chapters. I found myself reading some paragraphs several times before I actually captured what he was trying to say. Some chapters were endless pages of repetitive information. I must give Pinker credit, however, for the chapters that did capture my interest, however long and confusing.

    0 out of 2 people found this review helpful.

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  • Anonymous

    Posted December 14, 2004

    too much!!

    The author puts too much information in his book. As reader your overwhelmed, sometimes excited and very interested, but mostly borred and tedious! all in all to me a disappointing work

    0 out of 3 people found this review helpful.

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  • Anonymous

    Posted January 16, 2004

    UMMMMMM... NO

    dude... This book is nothing but long, complicated, boring, pages after pages of torture. Sometimes you have to read these thick paragraphs over and over until you understand it. You also have to understand everything in every page because he will use it for the rest of the book. I got 1/4 through chapter 2 before i lost interest and quit reading it. I highly recommend you dont read it. Read the Bible instead..

    0 out of 4 people found this review helpful.

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    Posted October 1, 2009

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    Posted March 23, 2011

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    Posted January 17, 2013

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    Posted June 13, 2014

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    Posted July 8, 2011

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    Posted December 30, 2010

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